{"id":4460,"date":"2026-09-09T11:43:56","date_gmt":"2026-09-09T09:43:56","guid":{"rendered":"https:\/\/istam.it\/?page_id=4460"},"modified":"2026-09-09T11:48:05","modified_gmt":"2026-09-09T09:48:05","slug":"honeycomb","status":"publish","type":"page","link":"https:\/\/istam.it\/en\/sectors\/honeycomb\/","title":{"rendered":"Honeycomb Seals and Honeycomb Cores in Superalloys for Turbines and Compressors"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@graph\": [\r\n    {\r\n      \"@type\": \"Organization\",\r\n      \"name\": \"Istam S.r.l.\",\r\n      \"url\": \"https:\/\/istam.it\/\",\r\n      \"logo\": \"https:\/\/istam.it\/wp-content\/uploads\/2022\/05\/logo_istam.png\",\r\n      \"sameAs\": [\r\n        \"https:\/\/www.linkedin.com\/company\/istam-s-r-l-\/\",\r\n        \"https:\/\/www.distrettoaerospazialepiemonte.com\/\"\r\n      ],\r\n      \"address\": {\r\n        \"@type\": \"PostalAddress\",\r\n        \"streetAddress\": \"Corso Re Umberto, 8\",\r\n        \"postalCode\": \"10100\",\r\n        \"addressLocality\": \"Torino\",\r\n        \"addressCountry\": \"IT\"\r\n      },\r\n      \"vatID\": \"08592870011\",\r\n      \"memberOf\": {\r\n        \"@type\": \"Organization\",\r\n        \"name\": \"Distretto Aerospaziale Piemonte (DAP)\",\r\n        \"url\": \"https:\/\/www.distrettoaerospazialepiemonte.com\/\"\r\n      },\r\n      \"hasCredential\": [\r\n        {\r\n          \"@type\": \"EducationalOccupationalCredential\",\r\n          \"credentialCategory\": \"certification\",\r\n          \"name\": \"EN 9100:2018 \/ ISO 9001:2015\",\r\n          \"recognizedBy\": {\r\n            \"@type\": \"Organization\",\r\n            \"name\": \"Kiwa Cermet Italia S.p.A.\",\r\n            \"url\": \"https:\/\/www.kiwa.com\/it\/it\/\"\r\n          },\r\n          \"about\": \"Production of cold-stamped sheet metal parts and assembly of technological sub-assemblies for the industrial, aerospace and automotive sectors\",\r\n          \"url\": \"https:\/\/istam.it\/wp-content\/uploads\/2025\/11\/CERT_00161_ITA_ENG_2025107163820.pdf\"\r\n        }\r\n      ]\r\n    },\r\n    {\r\n      \"@type\": \"BreadcrumbList\",\r\n      \"itemListElement\": [\r\n        { \"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/istam.it\/en\/\" },\r\n        { \"@type\": \"ListItem\", \"position\": 2, \"name\": \"Sectors\", \"item\": \"https:\/\/istam.it\/en\/sectors\/\" },\r\n        { \"@type\": \"ListItem\", \"position\": 3, \"name\": \"Honeycomb\", \"item\": \"https:\/\/istam.it\/en\/sectors\/honeycomb\/\" }\r\n      ]\r\n    },\r\n    {\r\n      \"@type\": \"FAQPage\",\r\n      \"inLanguage\": \"en\",\r\n      \"mainEntity\": [\r\n        { \"@type\": \"Question\", \"name\": \"What is a honeycomb seal?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"A honeycomb seal is a sealing system used in turbines, compressors and turbomachinery to limit gas or steam leakage between rotating and stationary components. The sealing surface is a metallic honeycomb structure made of open cells. It blocks fluid passage and dissipates its energy.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"What's the difference between a honeycomb core and a honeycomb seal?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"The honeycomb core is the metallic honeycomb structure made of open cells, built by assembling thin metal strips. The honeycomb seal is the complete sealing assembly in which the honeycomb core is integrated, typically by brazing it onto rings, segments or other metal supports.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"Is Hastelloy a special steel?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"No. It is a nickel-based superalloy. It is often informally called special steel because of its high-temperature resistance. ISTAM works with Hastelloy X for honeycomb cores used in gas turbines, steam turbines and industrial compressors.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"What materials are used for honeycomb cores?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"ISTAM manufactures honeycomb cores in Hastelloy X, Haynes 214, Haynes 224, stainless steel and aluminum. The choice depends on operating temperature, fluid composition, mechanical stress, operating environment and the intended brazing process. Honeycomb cores are integrated onto metal supports and rings using nickel-based brazing alloys compliant with AMS4776, AMS4777, AMS4778 and AMS4779.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"What cell sizes are available?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"ISTAM manufactures honeycomb cores with cell sizes of 3.2 mm, 4.8 mm, 6.4 mm, 9.5 mm, 12.7 mm and 19 mm. The 3.2 mm size is the most requested for technical applications. This range covers industrial applications, compressors and medium-to-large cell abradable components well. For finer-cell precision seals, feasibility should be verified with ISTAM.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"Is ISTAM certified?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes. ISTAM manufactures components certified under EN 9100:2018 and ISO 9001:2015. These are issued by Kiwa Cermet Italia under ACCREDIA accreditation, covering sheet metal parts and sub-assembly production for the industrial, aerospace and automotive sectors.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"How does a honeycomb seal work?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"A honeycomb seal controls fluid flow through the clearance between the rotating and stationary parts of a machine. The cell geometry generates micro-vortices, localized pressure variations and energy dissipation. This reduces the amount of fluid that can pass through the seal.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"What does \\\"abradable\\\" mean?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"An abradable structure is designed to wear or deform in a controlled way on contact with a rotating part. This protects more critical components such as blade tips. It allows tighter design clearances and lower leakage without compromising operational safety.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"What's the difference between honeycomb seals and labyrinth seals?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Labyrinth seals use a series of teeth and chambers to generate progressive pressure drops. Honeycomb seals use a metallic honeycomb surface instead. The two are sometimes combined, with honeycomb applied opposite labyrinth teeth. The choice between them depends on pressure, temperature, speed, clearance and fluid characteristics.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"Can honeycomb cores be manufactured to drawing?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes. ISTAM's honeycomb cores are manufactured to customer drawing or specification. Material, cell size, strip thickness, structure depth and configuration are customized for the downstream assembly or brazing process.\" } },\r\n        { \"@type\": \"Question\", \"name\": \"Who manufactures metallic honeycomb cores in Italy?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"ISTAM has been in business since 1973 and in the aerospace sector for 25 years. It manufactures metallic honeycomb cores in Italy in Hastelloy X, Haynes 214, Haynes 224, stainless steel and aluminum, for aerospace, power generation and industrial applications. Since 2023 it has invested in dedicated equipment for honeycomb core production, becoming one of the few specialized Italian manufacturers in this field. ISTAM is EN 9100:2018 \/ ISO 9001:2015 certified and a member of the Piedmont Aerospace District.\" } }\r\n      ]\r\n    }\r\n  ]\r\n}\r\n<\/script><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:4vw;--awb-padding-right:8vw;--awb-padding-bottom:4vw;--awb-padding-left:8vw;--awb-padding-top-small:48px;--awb-padding-bottom-small:64px;--awb-min-height:70vh;--awb-background-color:var(--awb-custom_color_6);--awb-flex-wrap:wrap;\" id=\"home\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-end fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_2_3 2_3 fusion-flex-column fusion-animated\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:2.88%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:2.88%;--awb-width-medium:75%;--awb-order-medium:0;--awb-spacing-right-medium:2.56%;--awb-spacing-left-medium:2.56%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-animationType=\"fadeInUp\" data-animationDuration=\"0.8\" data-animationOffset=\"top-into-view\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-title-text fusion-title-size-one\" style=\"--awb-text-color:var(--awb-color1);--awb-margin-bottom:16px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Honeycomb Seals and Honeycomb Cores in Superalloys for Turbines and Compressors<\/h1><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-1\" style=\"--awb-line-height:1.7;--awb-text-color:var(--awb-color1);\"><p><strong>ISTAM manufactures metallic honeycomb cores in superalloys in Italy<\/strong>. They are built to the customer&#8217;s technical specification for aerospace, power generation and industrial applications.<br \/>Honeycomb seals are sealing systems used in turbines, compressors and turbomachinery to limit gas or steam leakage between rotating and stationary components. <\/p>\n<p>Their sealing surface is a metallic honeycomb core. This is an open-cell, geometrically controlled structure that reduces fluid passage, allows tighter rotor-to-stator clearances, and manages incidental contact with rotating parts.<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:8vw;--awb-padding-left:8vw;--awb-background-color:var(--awb-custom_color_1);--awb-flex-wrap:wrap;\" id=\"home\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-end fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element\" style=\"--awb-bottom-shadow-color:var(--awb-custom_color_3);--awb-margin-top:-50px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><div class=\"awb-image-frame awb-image-frame-1 awb-bottomshadow\" style=\"max-width:720px;display:inline-block;\"><span class=\" fusion-imageframe imageframe-bottomshadow imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"1080\" height=\"475\" title=\"honeycomb-istam-settori\" src=\"https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori.jpg\" data-orig-src=\"https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori.jpg\" alt class=\"lazyload img-responsive wp-image-4425\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%271080%27%20height%3D%27475%27%20viewBox%3D%270%200%201080%20475%27%3E%3Crect%20width%3D%271080%27%20height%3D%27475%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori-200x88.jpg 200w, https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori-400x176.jpg 400w, https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori-600x264.jpg 600w, https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori-800x352.jpg 800w, https:\/\/istam.it\/wp-content\/uploads\/2026\/05\/honeycomb-istam-settori.jpg 1080w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 1024px) 100vw, (max-width: 640px) 100vw, 1080px\" \/><\/span><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" version=\"1.1\" width=\"100%\" viewBox=\"0 0 600 28\" preserveAspectRatio=\"none\"><g clip-path=\"url(#a)\"><mask id=\"b\" style=\"mask-type:luminance\" maskUnits=\"userSpaceOnUse\" x=\"0\" y=\"0\" width=\"600\" height=\"28\"><path d=\"M0 0h600v28H0V0Z\" fill=\"#fff\"\/><\/mask><g filter=\"url(#c)\" mask=\"url(#b)\"><path d=\"M16.439-18.667h567.123v30.8S438.961-8.4 300-8.4C161.04-8.4 16.438 12.133 16.438 12.133v-30.8Z\" fill=\"#000\"\/><\/g><\/g><defs><clipPath id=\"a\"><path fill=\"#fff\" d=\"M0 0h600v28H0z\"\/><\/clipPath><filter id=\"c\" x=\"5.438\" y=\"-29.667\" width=\"589.123\" height=\"52.8\" filterUnits=\"userSpaceOnUse\" color-interpolation-filters=\"sRGB\"><feFlood flood-opacity=\"0\" result=\"BackgroundImageFix\"\/><feBlend in=\"SourceGraphic\" in2=\"BackgroundImageFix\" result=\"shape\"\/><feGaussianBlur stdDeviation=\"5.5\" result=\"effect1_foregroundBlur_3983_183\"\/><\/filter><\/defs><\/svg><\/div><\/div><\/div><\/div><\/div><\/div><div id=\"about\" class=\"fusion-container-anchor\"><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-4 fusion-flex-container hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-background-position:left top;--awb-border-sizes-top:0px;--awb-border-sizes-bottom:0px;--awb-border-sizes-left:0px;--awb-border-sizes-right:0px;--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:0px;--awb-padding-right:0px;--awb-padding-bottom:0px;--awb-padding-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-stretch fusion-flex-content-wrap\" style=\"width:calc( 100% + 0px ) !important;max-width:calc( 100% + 0px ) !important;margin-left: calc(-0px \/ 2 );margin-right: calc(-0px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-top:48px;--awb-padding-right:10%;--awb-padding-bottom:48px;--awb-padding-left:10%;--awb-bg-color:var(--awb-custom_color_1);--awb-bg-color-hover:var(--awb-custom_color_1);--awb-bg-blend:overlay;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-2 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">What is a honeycomb seal?<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-2\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>A <strong>honeycomb seal<\/strong> is used in high-performance rotating machinery <strong>to control fluid leakage between stationary and rotating elements<\/strong>. The stationary sealing surface is lined with a metallic honeycomb structure. As gas or steam flows through the open cells, it generates flow resistance and energy dissipation. This blocks unwanted fluid passage and helps maintain machine efficiency over time.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-3 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">What's the difference between a honeycomb core and a honeycomb seal?<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-3\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>The <strong>honeycomb core<\/strong> is the alveolar metal structure itself. It is made of open cells, formed by assembling thin metal strips and joining them by spot welding into a regular, stable geometry.<\/p>\n<p>The <strong>honeycomb seal<\/strong> is the complete sealing assembly in which that core is integrated. It is shaped and applied to supports, rings or metal segments, typically by brazing, according to the component's design. The core is the functional element. The seal is the finished component built around it.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-4 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">How does a honeycomb seal work?<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-4\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>During turbine or compressor operation, part of the process fluid can pass through the clearance between the rotor and the stationary part of the machine. The <strong>honeycomb cell geometry<\/strong> disrupts that path. It generates localized pressure variations and micro-vortices. The fluid loses energy as it passes through the seal, and leakage flow is reduced as a result.<\/p>\n<\/div><div class=\"fusion-text fusion-text-5 fusion-text-no-margin\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);--awb-margin-bottom:0px;\"><p>Sealing performance depends on several design parameters:<\/p>\n<\/div><ul style=\"--awb-margin-bottom:20px;--awb-item-padding-bottom:2px;--awb-line-height:27.2px;--awb-icon-width:27.2px;--awb-icon-height:27.2px;--awb-icon-margin:11.2px;--awb-content-margin:38.4px;--awb-circlecolor:var(--awb-color4);--awb-circle-yes-font-size:14.08px;\" class=\"fusion-checklist fusion-checklist-1 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">cell size and depth<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">material thickness<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">rotor-to-stator clearance<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">rotational speed<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">operating pressure and temperature<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">direction and intensity of the circumferential flow component<\/div><\/li><\/ul><div class=\"fusion-text fusion-text-6\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Honeycomb geometry is never generic. It has to be engineered around the operating conditions of the specific turbomachine.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-5 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Abradable behavior: clearance control and rotor protection<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-7\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>One of the most valuable properties of honeycomb structures is their <strong>abradable nature<\/strong>. They are designed to wear away in a controlled manner on contact with a rotating part. During start-up, shutdown, or changes in operating conditions, thermal expansion and rotor movement can temporarily reduce the available clearance. This can bring blade tips or labyrinth teeth into contact with the honeycomb structure.<\/p>\n<p>When that happens, the honeycomb deforms or wears locally instead of damaging the rotating component. The rotating component is typically the more critical and expensive part to replace. This allows tighter design clearances and lower leakage without compromising operational safety. The seal adapts to the machine, not the other way around.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-6 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Reducing leakage in turbines and compressors<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-8 fusion-text-no-margin\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);--awb-margin-bottom:0px;\"><p>Any fluid that crosses the seal without contributing to the energy conversion process is an efficiency loss. <strong>Honeycomb seals<\/strong> help on several fronts:<\/p>\n<\/div><ul style=\"--awb-margin-bottom:20px;--awb-item-padding-bottom:2px;--awb-line-height:27.2px;--awb-icon-width:27.2px;--awb-icon-height:27.2px;--awb-icon-margin:11.2px;--awb-content-margin:38.4px;--awb-circlecolor:var(--awb-color4);--awb-circle-yes-font-size:14.08px;\" class=\"fusion-checklist fusion-checklist-2 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">containing flow between rotating and static components<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">reducing internal leakage<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">allowing tighter operating clearances<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">improving overall machine efficiency<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">controlling fluid-dynamic phenomena affecting the rotor<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">protecting rotating parts during incidental contact<\/div><\/li><\/ul><div class=\"fusion-text fusion-text-9\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Experimental studies across different configurations show leakage reductions compared with smooth surfaces and some traditional sealing solutions. Results still depend on cell geometry, clearance, pressure and inlet flow pre-swirl conditions.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-7 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Honeycomb seals vs. labyrinth seals<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-10\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Traditional labyrinth seals use a series of teeth and chambers to generate progressive pressure drops. In <strong>honeycomb labyrinth seals<\/strong>, the smooth surface opposite the teeth is replaced with a honeycomb structure. This increases flow-path complexity and changes the seal's fluid-dynamic behavior.<\/p>\n<\/div><div class=\"fusion-text fusion-text-11 fusion-text-no-margin\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);--awb-margin-bottom:0px;\"><p>Neither solution is automatically the right choice. The decision depends on:<\/p>\n<\/div><ul style=\"--awb-margin-bottom:20px;--awb-item-padding-bottom:2px;--awb-line-height:27.2px;--awb-icon-width:27.2px;--awb-icon-height:27.2px;--awb-icon-margin:11.2px;--awb-content-margin:38.4px;--awb-circlecolor:var(--awb-color4);--awb-circle-yes-font-size:14.08px;\" class=\"fusion-checklist fusion-checklist-3 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">required sealing performance<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">rotordynamic stability<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">rotor speed<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">inlet fluid conditions<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">operating temperatures and pressures<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">likelihood of contact between parts<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">service life and maintenance of the component<\/div><\/li><\/ul><div class=\"fusion-title title fusion-title-8 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">How metallic honeycomb cores are manufactured<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-12 fusion-text-no-margin\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);--awb-margin-bottom:0px;\"><p>Production starts from thin metal strips, formed into a regular sequence of cells. The process typically includes:<\/p>\n<\/div><ul style=\"--awb-margin-bottom:20px;--awb-item-padding-bottom:2px;--awb-line-height:27.2px;--awb-icon-width:27.2px;--awb-icon-height:27.2px;--awb-icon-margin:11.2px;--awb-content-margin:38.4px;--awb-circlecolor:var(--awb-color4);--awb-circle-yes-font-size:14.08px;\" class=\"fusion-checklist fusion-checklist-4 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">preparation and profiling of the metal strip<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">stacking of the formed sections<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">spot welding of the contact surfaces<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">formation of the cellular structure<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">cutting and shaping to the required dimensions<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">inspection of cell geometry and regularity<\/div><\/li><\/ul><div class=\"fusion-text fusion-text-13\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Process precision is not a detail here. Cell size, depth and uniformity directly affect the finished component's behavior. <strong>ISTAM manufactures its honeycomb structures to customer drawing or specification<\/strong>. There is no single product standard, since each application calls for a different combination of material, thickness and geometry.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-9 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Materials for high temperature and severe operating conditions<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-14 fusion-text-no-margin\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);--awb-margin-bottom:0px;\"><p>Honeycomb cores for turbines, compressors and aircraft engines have to withstand high temperatures, oxidation, mechanical stress and aggressive operating environments. ISTAM manufactures honeycomb cores in the following alloys and materials:<\/p>\n<\/div><ul style=\"--awb-margin-bottom:20px;--awb-item-padding-bottom:2px;--awb-line-height:27.2px;--awb-icon-width:27.2px;--awb-icon-height:27.2px;--awb-icon-margin:11.2px;--awb-content-margin:38.4px;--awb-circlecolor:var(--awb-color4);--awb-circle-yes-font-size:14.08px;\" class=\"fusion-checklist fusion-checklist-5 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">Hastelloy X<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">Hastelloy 214<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">Haynes 224<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">stainless steels<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">aluminum<\/div><\/li><\/ul><div class=\"fusion-text fusion-text-15 fusion-text-no-margin\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);--awb-margin-bottom:0px;\"><p>Material selection depends on operating temperature, fluid composition, the intended brazing process, and the mechanical properties required.<\/p>\n<p>ISTAM integrates the honeycomb core onto metallic supports, rings or segments using nickel-based brazing alloys compliant with AMS specifications. These include:<\/p>\n<\/div><ul style=\"--awb-margin-bottom:12px;--awb-item-padding-bottom:2px;--awb-line-height:27.2px;--awb-icon-width:27.2px;--awb-icon-height:27.2px;--awb-icon-margin:11.2px;--awb-content-margin:38.4px;--awb-circlecolor:var(--awb-color4);--awb-circle-yes-font-size:14.08px;\" class=\"fusion-checklist fusion-checklist-6 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">AMS4776 (BNi-1)<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">AMS4777 (BNi-2)<\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">AMS4778 (BNi-3) <\/div><\/li><li class=\"fusion-li-item\" style=\"--awb-circlecolor:var(--awb-custom_color_1);--awb-iconcolor:var(--awb-color4);\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-angle-right fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">AMS4779 (BNi-4)<\/div><\/li><\/ul><div class=\"fusion-text fusion-text-16\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>The specific alloy is selected based on the base material and the final component's operating conditions.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-10 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Is Hastelloy a special steel?<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-17\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>No. It is often informally called a special steel because of its high-temperature resistance. Hastelloy is actually a nickel-based superalloy. It is metallurgically different from steels, which are iron-based. <strong>ISTAM works with Hastelloy X to manufacture honeycomb cores for gas turbines, steam turbines and industrial compressors<\/strong>.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-11 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Available cell sizes<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-18\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>ISTAM manufactures honeycomb cores in the following cell sizes: 3.2 mm, 4.8 mm, 6.4 mm, 9.5 mm, 12.7 mm and 19 mm.<\/p>\n<p>The <strong>3.2 mm size is the most requested for technical applications<\/strong>. This range fits industrial applications, compressors and medium-to-large cell abradable components well. Fine-cell precision seals below 3.2 mm are typical of some high-speed aerospace applications. Feasibility for these should be confirmed directly with ISTAM on a case-by-case basis.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-12 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Quality and certifications<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-19\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>ISTAM manufactures certified components under EN 9100:2018 and ISO 9001:2015. These certifications are issued by Kiwa Cermet Italia under ACCREDIA accreditation.<\/p>\n<p>They cover the production of cold-stamped sheet metal parts and the assembly of technological sub-assemblies for the industrial, aerospace and automotive sectors. These are the same fields in which honeycomb cores are used.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-13 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Where honeycomb seals are used<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-20\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Honeycomb structures are used wherever there are high-speed turbomachines and severe operating conditions.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-14 fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:var(--awb-color7);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:22px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h3 class=\"fusion-title-heading title-heading-left\" style=\"font-family:var(--awb-typography1-font-family);font-weight:var(--awb-typography1-font-weight);font-style:var(--awb-typography1-font-style);margin:0;font-size:1em;line-height:1.3;\">Aircraft engines and the aerospace sector<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-21\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>In aircraft turbine engines, honeycomb structures can be used wherever clearance control between rotating and stationary parts is needed. This limits leakage and protects components in case of contact.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-15 fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:var(--awb-color7);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:22px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h3 class=\"fusion-title-heading title-heading-left\" style=\"font-family:var(--awb-typography1-font-family);font-weight:var(--awb-typography1-font-weight);font-style:var(--awb-typography1-font-style);margin:0;font-size:1em;line-height:1.3;\">Gas turbines<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-22\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>In gas turbines for power generation, honeycomb seals help manage internal flows and maintain machine efficiency.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-16 fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:var(--awb-color7);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:22px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h3 class=\"fusion-title-heading title-heading-left\" style=\"font-family:var(--awb-typography1-font-family);font-weight:var(--awb-typography1-font-weight);font-style:var(--awb-typography1-font-style);margin:0;font-size:1em;line-height:1.3;\">Steam turbines<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-23\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Honeycomb seals can be used in steam turbines to reduce leakage between machine sections and manage contact with rotating components.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-17 fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:var(--awb-color7);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:22px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h3 class=\"fusion-title-heading title-heading-left\" style=\"font-family:var(--awb-typography1-font-family);font-weight:var(--awb-typography1-font-weight);font-style:var(--awb-typography1-font-style);margin:0;font-size:1em;line-height:1.3;\">Centrifugal compressors<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-24\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>In industrial compressors, honeycomb seals control gas leakage. In certain configurations they also contribute to the system's rotordynamic stability.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-18 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Honeycomb core manufacturer in Italy<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-25\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>ISTAM has been in business since 1973. It has worked in the aerospace sector for 25 years, specializing in thin sheet metal processing, forming and spot welding of components in aluminum, steel and special alloys. Since 2023, ISTAM has invested in dedicated equipment to extend this expertise to the <strong>production of honeycomb cores in superalloys<\/strong>. It is now one of the few specialized Italian manufacturers in this field.<\/p>\n<p>ISTAM is a member of the <em>Piedmont Aerospace District<\/em>. This is the association bringing together the main players in Piedmont's aerospace sector, including companies, research institutions and public bodies.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-19 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Why choose custom-specification honeycomb cores<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-26\" style=\"--awb-line-height:1.6;--awb-text-color:var(--awb-custom_color_5);\"><p>Every seal operates under different conditions. Pressure, temperature, speed, fluid, clearance and material all change from one application to the next, and so does the behavior required from the honeycomb structure. Manufacturing to specification means being able to adapt material, strip thickness, cell shape and size, structure depth, blank dimensions and the configuration needed for downstream integration.<\/p>\n<p>Working with a specialized manufacturer means arriving at a solution consistent with both the application's technical requirements and the assembly or brazing processes that follow.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-20 fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:var(--awb-custom_color_6);--awb-margin-bottom:12px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:20px;--awb-margin-left-small:0px;--awb-font-size:28px;\"><div class=\"title-sep-container title-sep-container-left fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><span class=\"awb-title-spacer fusion-no-large-visibility fusion-no-medium-visibility fusion-no-small-visibility\"><\/span><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;font-size:1em;line-height:1.3;\">Frequently asked questions about honeycomb cores and honeycomb seals<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep- sep-solid\" style=\"border-color:hsla(var(--awb-color3-h),calc( var(--awb-color3-s) + 3% ),var(--awb-color3-l),var(--awb-color3-a));\"><\/div><\/div><\/div><div class=\"accordian fusion-accordian\" style=\"--awb-border-size:1px;--awb-icon-size:12px;--awb-content-font-size:var(--awb-typography4-font-size);--awb-icon-alignment:left;--awb-hover-color:hsla(var(--awb-color7-h),var(--awb-color7-s),calc( var(--awb-color7-l) + 78% ),var(--awb-color7-a));--awb-border-color:hsla(var(--awb-color7-h),var(--awb-color7-s),calc( var(--awb-color7-l) + 60% ),var(--awb-color7-a));--awb-background-color:var(--awb-color1);--awb-divider-color:var(--awb-custom_color_2);--awb-divider-hover-color:var(--awb-custom_color_2);--awb-icon-color:var(--awb-color1);--awb-title-color:var(--awb-custom_color_2);--awb-content-color:var(--awb-custom_color_5);--awb-icon-box-color:var(--awb-custom_color_6);--awb-toggle-hover-accent-color:var(--awb-custom_color_2);--awb-title-font-family:var(--awb-typography1-font-family);--awb-title-font-weight:var(--awb-typography1-font-weight);--awb-title-font-style:var(--awb-typography1-font-style);--awb-content-font-family:var(--awb-typography4-font-family);--awb-content-font-weight:var(--awb-typography4-font-weight);--awb-content-font-style:var(--awb-typography4-font-style);\"><div class=\"panel-group fusion-toggle-icon-boxed\" id=\"accordion-4460-1\"><div class=\"fusion-panel panel-default panel-f7f17221e5a879f2d fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_f7f17221e5a879f2d\"><a aria-expanded=\"false\" aria-controls=\"f7f17221e5a879f2d\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#f7f17221e5a879f2d\" href=\"#f7f17221e5a879f2d\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">What is a honeycomb seal?<\/span><\/a><\/h4><\/div><div id=\"f7f17221e5a879f2d\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_f7f17221e5a879f2d\"><div class=\"panel-body toggle-content fusion-clearfix\">A honeycomb seal is a sealing system used in turbines, compressors and turbomachinery to limit gas or steam leakage between rotating and stationary components. The sealing surface is a metallic honeycomb structure made of open cells. It blocks fluid passage and dissipates its energy.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-50ceb6f99820605f2 fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_50ceb6f99820605f2\"><a aria-expanded=\"false\" aria-controls=\"50ceb6f99820605f2\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#50ceb6f99820605f2\" href=\"#50ceb6f99820605f2\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">What&#039;s the difference between a honeycomb core and a honeycomb seal?<\/span><\/a><\/h4><\/div><div id=\"50ceb6f99820605f2\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_50ceb6f99820605f2\"><div class=\"panel-body toggle-content fusion-clearfix\">The honeycomb core is the metallic honeycomb structure made of open cells, built by assembling thin metal strips. The honeycomb seal is the complete sealing assembly in which the honeycomb core is integrated, typically by brazing it onto rings, segments or other metal supports.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-8c67b5a6720385838 fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_8c67b5a6720385838\"><a aria-expanded=\"false\" aria-controls=\"8c67b5a6720385838\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#8c67b5a6720385838\" href=\"#8c67b5a6720385838\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">Is Hastelloy a special steel?<\/span><\/a><\/h4><\/div><div id=\"8c67b5a6720385838\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_8c67b5a6720385838\"><div class=\"panel-body toggle-content fusion-clearfix\">No. It is a nickel-based superalloy. It is often informally called special steel because of its high-temperature resistance. ISTAM works with Hastelloy X for honeycomb cores used in gas turbines, steam turbines and industrial compressors.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-c9d2aa3293b47629b fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_c9d2aa3293b47629b\"><a aria-expanded=\"false\" aria-controls=\"c9d2aa3293b47629b\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#c9d2aa3293b47629b\" href=\"#c9d2aa3293b47629b\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">What materials are used for honeycomb cores?<\/span><\/a><\/h4><\/div><div id=\"c9d2aa3293b47629b\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_c9d2aa3293b47629b\"><div class=\"panel-body toggle-content fusion-clearfix\">ISTAM manufactures honeycomb cores in Hastelloy X, Haynes 214, Haynes 224, stainless steel and aluminum. The choice depends on operating temperature, fluid composition, mechanical stress, operating environment and the intended brazing process. Honeycomb cores are integrated onto metal supports and rings using nickel-based brazing alloys compliant with AMS4776, AMS4777, AMS4778 and AMS4779.<\/p>\n<p>Per l'integrazione dell'honeycomb core su supporti e anelli metallici vengono utilizzate leghe brasanti a base nichel conformi a AMS4776, AMS4777, AMS4778 e AMS4779.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-ffcb1f206c7ff7559 fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_ffcb1f206c7ff7559\"><a aria-expanded=\"false\" aria-controls=\"ffcb1f206c7ff7559\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#ffcb1f206c7ff7559\" href=\"#ffcb1f206c7ff7559\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">What cell sizes are available?<\/span><\/a><\/h4><\/div><div id=\"ffcb1f206c7ff7559\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_ffcb1f206c7ff7559\"><div class=\"panel-body toggle-content fusion-clearfix\">ISTAM manufactures honeycomb cores with cell sizes of 3.2 mm, 4.8 mm, 6.4 mm, 9.5 mm, 12.7 mm and 19 mm. The 3.2 mm size is the most requested for technical applications. This range covers industrial applications, compressors and medium-to-large cell abradable components well. For finer-cell precision seals, feasibility should be verified with ISTAM.<br \/>Per l'integrazione dell'honeycomb core su supporti e anelli metallici vengono utilizzate leghe brasanti a base nichel conformi a AMS4776, AMS4777, AMS4778 e AMS4779.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-c31fff523c1bc76ce fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_c31fff523c1bc76ce\"><a aria-expanded=\"false\" aria-controls=\"c31fff523c1bc76ce\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#c31fff523c1bc76ce\" href=\"#c31fff523c1bc76ce\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">Is ISTAM certified?<\/span><\/a><\/h4><\/div><div id=\"c31fff523c1bc76ce\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_c31fff523c1bc76ce\"><div class=\"panel-body toggle-content fusion-clearfix\">Yes. ISTAM manufactures components certified under EN 9100:2018 and ISO 9001:2015. These are issued by Kiwa Cermet Italia under ACCREDIA accreditation, covering sheet metal parts and sub-assembly production for the industrial, aerospace and automotive sectors.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-ac79a3e19346ae8ca fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_ac79a3e19346ae8ca\"><a aria-expanded=\"false\" aria-controls=\"ac79a3e19346ae8ca\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#ac79a3e19346ae8ca\" href=\"#ac79a3e19346ae8ca\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">How does a honeycomb seal work?<\/span><\/a><\/h4><\/div><div id=\"ac79a3e19346ae8ca\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_ac79a3e19346ae8ca\"><div class=\"panel-body toggle-content fusion-clearfix\">A honeycomb seal controls fluid flow through the clearance between the rotating and stationary parts of a machine. The cell geometry generates micro-vortices, localized pressure variations and energy dissipation. This reduces the amount of fluid that can pass through the seal.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-3eefd04bffcdc3044 fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_3eefd04bffcdc3044\"><a aria-expanded=\"false\" aria-controls=\"3eefd04bffcdc3044\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#3eefd04bffcdc3044\" href=\"#3eefd04bffcdc3044\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">What does \u201cabradable\u201d mean?<\/span><\/a><\/h4><\/div><div id=\"3eefd04bffcdc3044\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_3eefd04bffcdc3044\"><div class=\"panel-body toggle-content fusion-clearfix\">An abradable structure is designed to wear or deform in a controlled way on contact with a rotating part. This protects more critical components such as blade tips. It allows tighter design clearances and lower leakage without compromising operational safety.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-c7074a037f01b5cb0 fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_c7074a037f01b5cb0\"><a aria-expanded=\"false\" aria-controls=\"c7074a037f01b5cb0\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#c7074a037f01b5cb0\" href=\"#c7074a037f01b5cb0\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">What&#039;s the difference between honeycomb seals and labyrinth seals?<\/span><\/a><\/h4><\/div><div id=\"c7074a037f01b5cb0\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_c7074a037f01b5cb0\"><div class=\"panel-body toggle-content fusion-clearfix\">Labyrinth seals use a series of teeth and chambers to generate progressive pressure drops. Honeycomb seals use a metallic honeycomb surface instead. The two are sometimes combined, with honeycomb applied opposite labyrinth teeth. The choice between them depends on pressure, temperature, speed, clearance and fluid characteristics.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-2ec3243737f0ad1d4 fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_2ec3243737f0ad1d4\"><a aria-expanded=\"false\" aria-controls=\"2ec3243737f0ad1d4\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#2ec3243737f0ad1d4\" href=\"#2ec3243737f0ad1d4\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">Can honeycomb cores be manufactured to drawing?<\/span><\/a><\/h4><\/div><div id=\"2ec3243737f0ad1d4\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_2ec3243737f0ad1d4\"><div class=\"panel-body toggle-content fusion-clearfix\">Yes. ISTAM's honeycomb cores are manufactured to customer drawing or specification. Material, cell size, strip thickness, structure depth and configuration are customized for the downstream assembly or brazing process.<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-365b657492fe4fddd fusion-toggle-has-divider\" style=\"--awb-content-font-size:14px;--awb-content-line-height:1.6;\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_365b657492fe4fddd\"><a aria-expanded=\"false\" aria-controls=\"365b657492fe4fddd\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-4460-1\" data-target=\"#365b657492fe4fddd\" href=\"#365b657492fe4fddd\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">Who manufactures metallic honeycomb cores in Italy?<\/span><\/a><\/h4><\/div><div id=\"365b657492fe4fddd\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_365b657492fe4fddd\"><div class=\"panel-body toggle-content fusion-clearfix\">ISTAM has been in business since 1973 and in the aerospace sector for 25 years. It manufactures metallic honeycomb cores in Italy in Hastelloy X, Haynes 214, Haynes 224, stainless steel and aluminum, for aerospace, power generation and industrial applications. Since 2023 it has invested in dedicated equipment for honeycomb core production, becoming one of the few specialized Italian manufacturers in this field. ISTAM is EN 9100:2018 \/ ISO 9001:2015 certified and a member of the Piedmont Aerospace District.<\/div><\/div><\/div><\/div><\/div><div ><a class=\"fusion-button button-flat fusion-button-default-size button-default fusion-button-default button-1 fusion-button-default-span fusion-button-default-type\" style=\"--awb-margin-top:24px;\" target=\"_self\" href=\"https:\/\/istam.it\/en\/sectors\/\"><i class=\"fa-arrow-circle-left fas awb-button__icon awb-button__icon--default button-icon-left\" aria-hidden=\"true\"><\/i><span class=\"fusion-button-text awb-button__text awb-button__text--default\">Return to sectors<\/span><\/a><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":4425,"parent":1488,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"100-width.php","meta":{"footnotes":""},"class_list":["post-4460","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Honeycomb Seals and Cores in Hastelloy | Istam<\/title>\n<meta name=\"description\" content=\"Honeycomb cores in Hastelloy X and superalloys for gas turbines, steam turbines and compressors. 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