{"id":1173,"date":"2026-10-22T13:45:26","date_gmt":"2026-10-22T13:45:26","guid":{"rendered":"https:\/\/www.marcorubber.com\/blog\/?p=1173"},"modified":"2026-10-22T13:45:26","modified_gmt":"2026-10-22T13:45:26","slug":"aerospace-defense-mil-spec-o-ring-materials-for-fuel-hydraulics-and-cold","status":"publish","type":"post","link":"https:\/\/www.marcorubber.com\/blog\/?p=1173","title":{"rendered":"Aerospace &#038; Defense: MIL-Spec O-Ring Materials for Fuel, Hydraulics, and Cold"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">\u00a0dealing Aerospace O-ring materials must perform in extreme conditions and pass strict documentation requirements. They face jet fuel, hydraulic fluids, and temperatures from -65\u00b0F at altitude to the heat of an engine bay. Just as important, most applications call out a specific MIL-SPEC or AMS material. This article covers the compounds approved for aerospace hydraulic systems, jet fuel, low-temperature service, and a NASA-rated FFKM for hypergolic rocket propellants. For guidance beyond aerospace, visit our <a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1135\">Complete Guide to Elastomer Seal Materials<\/a>.<\/span><\/p>\n<h2><strong>Aerospace O-Ring Materials<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Aerospace seals must pass both physics and paperwork. They see -65\u00b0F at altitude, hot engine bays, and specialty fluids. Just as important, they must meet a named specification with traceable lot records. Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/o-ring-mil-specs-chart.htm\" target=\"_blank\" rel=\"noopener\">Military and Aerospace Specification Reference Guide<\/a> lists compounds approved to AMS, AS, MS, MIL, and NAS specs. Marco also stocks popular sizes from QPL manufacturers and offers MIL-P-4861 packaging on request.<\/span><\/p>\n<h3><strong>Sealing Solutions That Meet MIL-SPEC Requirements for Aerospace Hydraulic Systems<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Most military aircraft hydraulics run on petroleum-based fluids such as MIL-H-5606. For these systems, two NBR specifications dominate.<\/span><\/p>\n<ul>\n<li><strong>AMS-P-83461 (Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/M1001\" target=\"_blank\" rel=\"noopener\">M1001<\/a>):<\/strong> a QPL nitrile rated -65\u00b0F to 275\u00b0F. It offers better dynamic performance and<br \/>\nlonger service life at 257\u00b0F than the older spec. It covers M83461\/1 and M83461\/2 sizes.<\/li>\n<li><strong>AMS-P-25732 (Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/M1000\" target=\"_blank\" rel=\"noopener\">M1000<\/a>):<\/strong> the MS28775 spec, rated -65\u00b0F to 275\u00b0F. It remains a proven, recommended choice for military aircraft hydraulics, especially in low-temperature service.<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When working with higher-temperature hydraulic and lube systems, FKM specifications apply. For example, Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1002\" target=\"_blank\" rel=\"noopener\">V1002<\/a> is a 75-durometer FKM made to AMS 7276 and MIL-R-83248C. In addition, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1004\" target=\"_blank\" rel=\"noopener\">V1004<\/a> and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1005\" target=\"_blank\" rel=\"noopener\">V1005<\/a> cover higher-temperature hydraulic service. For jet engine and APU applications, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1217\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1217<\/a> FFKM meets AMS 7257.<br \/>\nFinally, pair high-pressure hydraulic O-rings with PTFE backup rings per MIL-R-879v1, such as MS28774 scarf-cut rings. See Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/o-ring-backup-rings.htm\" target=\"_blank\" rel=\"noopener\">backup rings<\/a> for options.<\/span><\/p>\n<h3><strong>Rubber Compounds Rated for Jet Fuel and Aviation Hydraulic Fluid<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">The right compound depends on the fluid. Jet fuel and petroleum hydraulic fluid favor one set of materials. By contrast, phosphate-ester fluids such as Skydrol\u00ae need a completely different polymer.<\/span><\/p>\n<ul>\n<li><strong>Jet fuel, first choice:<\/strong> <a href=\"https:\/\/www.marcorubber.com\/fluorosilicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">fluorosilicone (FVMQ)<\/a> combines fuel resistance with excellent low-temperature flexibility. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/F1001\" target=\"_blank\" rel=\"noopener\">F1001<\/a> is a 70-durometer blue fluorosilicone per AMS-R-25988, rated -100\u00b0F to 350\u00b0F. Marco also offers <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/F1002\" target=\"_blank\" rel=\"noopener\">F1002<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/F1003\" target=\"_blank\" rel=\"noopener\">F1003<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/F1004\" target=\"_blank\" rel=\"noopener\">F1004<\/a>.<\/li>\n<li><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 1rem;\"><strong>Jet fuel, nitrile alternative:<\/strong> AMS 7270 nitrile (Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/M1007\" target=\"_blank\" rel=\"noopener\">M1007<\/a>) is rated -40\u00b0F to 302\u00b0F for piston and jet <\/span>engine fuels.<\/li>\n<li><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 1rem;\"><strong>Jet fuel and oils at high temperature:<\/strong> FKM to AMS 7276 or MIL-R-83248 adds heat and compression set <\/span>resistance.<\/li>\n<li><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 1rem;\"><strong>Phosphate-ester hydraulic fluid (Skydrol):<\/strong> use EPDM (AMS 3248) or butyl (AMS 7263 or AMS 7277). <\/span><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 1rem;\">Notably, NBR, FKM, and fluorosilicone are not compatible.<\/span><\/li>\n<\/ul>\n<h3><strong>Best O-Ring and Seal Materials for Low-Temperature Aerospace Applications<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Cold makes seals stiff, and stiff seals leak. Therefore, compare the TR-10 temperature, not just the catalog low limit.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For the coldest service, silicone leads. Extreme low-temperature grades such as AMS 3334 through AMS 3338 stay flexible well below -65\u00b0F. However, silicone has poor fuel resistance and wear. Where fuel is present, fluorosilicone is the better choice. For hot and cold fuel systems, low-temperature FKM grades help. For example, AMS-R-83485 covers FKM with improved low-temperature performance. Meanwhile, Marco&#8217;s ULT FKM (<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1166\" target=\"_blank\" rel=\"noopener\">V1166<\/a>) reaches -65\u00b0F with a TR-10 of -49\u00b0F.<\/span><\/p>\n<h3><strong>Seals for Hypergolic Rocket Propellants<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Space propulsion systems add another challenge: hypergolic propellants. For these systems, Freudenberg-NOK Sealing Technologies&#8217; Simriz\u00ae 486 FFKM earned a NASA &#8220;A&#8221; compatibility rating in both MON-3 and MMH. It showed no deterioration of physical properties after 48 hours at 160\u00b0F (71\u00b0C). However, its low limit is +20\u00b0F (-7\u00b0C), so confirm that cold-soak conditions stay in range. Marco Sealing Solutions is an approved <a href=\"https:\/\/www.fst.com\/\" target=\"_blank\" rel=\"noopener\">Freudenberg-NOK<\/a> distributor, so you can buy <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a> online (a white, 75 Shore A FFKM compound from <a href=\"https:\/\/www.fst.com\/\" target=\"_blank\" rel=\"noopener\">Freudenberg-NOK Sealing Technologies<\/a>) or <a href=\"https:\/\/www.marcorubber.com\/inquiry-quote.htm\" target=\"_blank\" rel=\"noopener\">request a quote or engineering support<\/a> directly from Marco.<\/span><\/p>\n<p><a href=\"https:\/\/www.marcorubber.com\/inquiry-quote.htm\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1053\" src=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/08\/CTA-Engineer-connect-slim.jpg\" alt=\"Contact an engineer\" width=\"1024\" height=\"280\" srcset=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/08\/CTA-Engineer-connect-slim.jpg 1024w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/08\/CTA-Engineer-connect-slim-300x82.jpg 300w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/08\/CTA-Engineer-connect-slim-768x210.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<h2><strong>Elastomer Materials by Industry and Application<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Visit our <a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1135\">Complete Guide to Elastomer Seal Materials<\/a> to consult our quick reference tables for typical temperature ranges and elastomer seal materials by application. Read on to find application-specific recommendations for other industries.<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1149\" target=\"_blank\" rel=\"noopener\">Elastomer Seal Materials for Medical Device &amp; Pharmaceutical Processing<\/a><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1155\" target=\"_blank\" rel=\"noopener\">Food and Beverage: O-Ring Materials Approved for Direct Food Contact<\/a><\/span><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1160\" target=\"_blank\" rel=\"noopener\">Plasma-Resistant Seals and Elastomer Seal Materials for Semiconductor Fabs<\/a><\/span><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1163\" target=\"_blank\" rel=\"noopener\">Elastomer Seal Materials for Oil &amp; Gas: Subsea, Sour Gas, and Refinery Service<\/a><\/span><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1167\" target=\"_blank\" rel=\"noopener\">Chemical-Resistant Seals for Aggressive Solvents in Chemical Processing<\/a><\/span><\/li>\n<li><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1180\" target=\"_blank\" rel=\"noopener\">Elastomer Seal Materials for Automotive &amp; Industrial Equipment<\/a><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.marcorubber.com\/inquiry-quote.htm\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-905\" src=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/04\/Request-Quote-CTA.png\" alt=\"Request a quote for FFKM with tight lead times.\" width=\"1028\" height=\"280\" srcset=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/04\/Request-Quote-CTA.png 1028w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/04\/Request-Quote-CTA-300x82.png 300w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/04\/Request-Quote-CTA-1024x279.png 1024w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/04\/Request-Quote-CTA-768x209.png 768w\" sizes=\"auto, (max-width: 1028px) 100vw, 1028px\" \/><\/a><br \/>\n&#8212;<\/p>\n<h3>Related Reading<\/h3>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/o-ring-size-chart-index.htm\" target=\"_blank\" rel=\"noopener\">Standard O-Ring Size Charts<\/a><\/span><br \/>\n<span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/o-ring-groove-design-directory.htm\" target=\"_blank\" rel=\"noopener\">O-Ring Groove Design Guides<\/a><\/span><br \/>\n<span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/custom-sealing-solutions.htm\" target=\"_blank\" rel=\"noopener\">Custom Sealing Solutions &#8211; From Prototype to Production<\/a><\/span><br \/>\n<span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1016\" target=\"_blank\" rel=\"noopener\">Engineered Sealing Solutions: Your Questions About Custom O-Rings, Compounds &amp; Assemblies, Answered<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0dealing Aerospace O-ring materials must perform in extreme conditions and pass strict documentation requirements. They face jet fuel, hydraulic fluids, and temperatures from -65\u00b0F at altitude to the heat of an engine bay. Just as important, most applications call out a specific MIL-SPEC or AMS material. This article covers the compounds approved for aerospace hydraulic [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":1146,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1173","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Aerospace O-Ring Materials: MIL-SPEC, Jet Fuel &amp; Cold<\/title>\n<meta name=\"description\" content=\"Find MIL-SPEC aerospace O-ring materials for hydraulic systems, jet fuel, and low-temperature service, plus Simriz 486 for hypergolics.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.marcorubber.com\/blog\/?p=1173\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aerospace O-Ring Materials: MIL-SPEC, Jet Fuel &amp; Cold\" \/>\n<meta property=\"og:description\" content=\"Find MIL-SPEC aerospace O-ring materials for hydraulic systems, jet fuel, and low-temperature service, plus Simriz 486 for hypergolics.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.marcorubber.com\/blog\/?p=1173\" \/>\n<meta property=\"og:site_name\" content=\"Marco Rubber and Plastics\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-22T13:45:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Marco Sealing Solutions Staff\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marco Sealing Solutions Staff\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173\"},\"author\":{\"name\":\"Marco Sealing Solutions Staff\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#\/schema\/person\/78c7eee8d1c9c49cf2a7d1199b44d353\"},\"headline\":\"Aerospace &#038; Defense: MIL-Spec O-Ring Materials for Fuel, Hydraulics, and Cold\",\"datePublished\":\"2026-10-22T13:45:26+00:00\",\"dateModified\":\"2026-10-22T13:45:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173\"},\"wordCount\":764,\"publisher\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg\",\"articleSection\":[\"General\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173\",\"url\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173\",\"name\":\"Aerospace O-Ring Materials: MIL-SPEC, Jet Fuel & Cold\",\"isPartOf\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg\",\"datePublished\":\"2026-10-22T13:45:26+00:00\",\"dateModified\":\"2026-10-22T13:45:26+00:00\",\"description\":\"Find MIL-SPEC aerospace O-ring materials for hydraulic systems, jet fuel, and low-temperature service, plus Simriz 486 for hypergolics.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.marcorubber.com\/blog\/?p=1173\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage\",\"url\":\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg\",\"contentUrl\":\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg\",\"width\":1200,\"height\":675,\"caption\":\"O-ring materials for aerospace and defense\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/?p=1173#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.marcorubber.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Aerospace &#038; Defense: MIL-Spec O-Ring Materials for Fuel, Hydraulics, and Cold\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#website\",\"url\":\"https:\/\/www.marcorubber.com\/blog\/\",\"name\":\"Marco Rubber and Plastics\",\"description\":\"Sealing Industry Insights, News &amp; More\",\"publisher\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.marcorubber.com\/blog\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#organization\",\"name\":\"Marco Rubber & PLastics\",\"url\":\"https:\/\/www.marcorubber.com\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2021\/03\/logo.png\",\"contentUrl\":\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2021\/03\/logo.png\",\"width\":420,\"height\":100,\"caption\":\"Marco Rubber & PLastics\"},\"image\":{\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#\/schema\/person\/78c7eee8d1c9c49cf2a7d1199b44d353\",\"name\":\"Marco Sealing Solutions Staff\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.marcorubber.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/43e50153e1385e54670f329f22925ba6eadf70eab58f313f59151864b294e3b8?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/43e50153e1385e54670f329f22925ba6eadf70eab58f313f59151864b294e3b8?s=96&d=mm&r=g\",\"caption\":\"Marco Sealing Solutions Staff\"},\"url\":\"https:\/\/www.marcorubber.com\/blog\/?author=9\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Aerospace O-Ring Materials: MIL-SPEC, Jet Fuel & Cold","description":"Find MIL-SPEC aerospace O-ring materials for hydraulic systems, jet fuel, and low-temperature service, plus Simriz 486 for hypergolics.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.marcorubber.com\/blog\/?p=1173","og_locale":"en_US","og_type":"article","og_title":"Aerospace O-Ring Materials: MIL-SPEC, Jet Fuel & Cold","og_description":"Find MIL-SPEC aerospace O-ring materials for hydraulic systems, jet fuel, and low-temperature service, plus Simriz 486 for hypergolics.","og_url":"https:\/\/www.marcorubber.com\/blog\/?p=1173","og_site_name":"Marco Rubber and Plastics","article_published_time":"2026-10-22T13:45:26+00:00","og_image":[{"width":1200,"height":675,"url":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg","type":"image\/jpeg"}],"author":"Marco Sealing Solutions Staff","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Marco Sealing Solutions Staff","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#article","isPartOf":{"@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173"},"author":{"name":"Marco Sealing Solutions Staff","@id":"https:\/\/www.marcorubber.com\/blog\/#\/schema\/person\/78c7eee8d1c9c49cf2a7d1199b44d353"},"headline":"Aerospace &#038; Defense: MIL-Spec O-Ring Materials for Fuel, Hydraulics, and Cold","datePublished":"2026-10-22T13:45:26+00:00","dateModified":"2026-10-22T13:45:26+00:00","mainEntityOfPage":{"@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173"},"wordCount":764,"publisher":{"@id":"https:\/\/www.marcorubber.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage"},"thumbnailUrl":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg","articleSection":["General"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173","url":"https:\/\/www.marcorubber.com\/blog\/?p=1173","name":"Aerospace O-Ring Materials: MIL-SPEC, Jet Fuel & Cold","isPartOf":{"@id":"https:\/\/www.marcorubber.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage"},"image":{"@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage"},"thumbnailUrl":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg","datePublished":"2026-10-22T13:45:26+00:00","dateModified":"2026-10-22T13:45:26+00:00","description":"Find MIL-SPEC aerospace O-ring materials for hydraulic systems, jet fuel, and low-temperature service, plus Simriz 486 for hypergolics.","breadcrumb":{"@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.marcorubber.com\/blog\/?p=1173"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#primaryimage","url":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg","contentUrl":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/10\/Blog-Elastomer-Guide-MIL-Spec.jpg","width":1200,"height":675,"caption":"O-ring materials for aerospace and defense"},{"@type":"BreadcrumbList","@id":"https:\/\/www.marcorubber.com\/blog\/?p=1173#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.marcorubber.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Aerospace &#038; Defense: MIL-Spec O-Ring Materials for Fuel, Hydraulics, and Cold"}]},{"@type":"WebSite","@id":"https:\/\/www.marcorubber.com\/blog\/#website","url":"https:\/\/www.marcorubber.com\/blog\/","name":"Marco Rubber and Plastics","description":"Sealing Industry Insights, News &amp; More","publisher":{"@id":"https:\/\/www.marcorubber.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.marcorubber.com\/blog\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.marcorubber.com\/blog\/#organization","name":"Marco Rubber & PLastics","url":"https:\/\/www.marcorubber.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.marcorubber.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2021\/03\/logo.png","contentUrl":"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2021\/03\/logo.png","width":420,"height":100,"caption":"Marco Rubber & PLastics"},"image":{"@id":"https:\/\/www.marcorubber.com\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.marcorubber.com\/blog\/#\/schema\/person\/78c7eee8d1c9c49cf2a7d1199b44d353","name":"Marco Sealing Solutions Staff","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.marcorubber.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/43e50153e1385e54670f329f22925ba6eadf70eab58f313f59151864b294e3b8?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/43e50153e1385e54670f329f22925ba6eadf70eab58f313f59151864b294e3b8?s=96&d=mm&r=g","caption":"Marco Sealing Solutions Staff"},"url":"https:\/\/www.marcorubber.com\/blog\/?author=9"}]}},"_links":{"self":[{"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1173"}],"version-history":[{"count":3,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1173\/revisions"}],"predecessor-version":[{"id":1195,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1173\/revisions\/1195"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=\/wp\/v2\/media\/1146"}],"wp:attachment":[{"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.marcorubber.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}