{"id":1163,"date":"2026-10-22T13:45:40","date_gmt":"2026-10-22T13:45:40","guid":{"rendered":"https:\/\/www.marcorubber.com\/blog\/?p=1163"},"modified":"2026-10-22T13:45:40","modified_gmt":"2026-10-22T13:45:40","slug":"elastomer-seal-materials-for-oil-gas-subsea-sour-gas-and-refinery-service","status":"publish","type":"post","link":"https:\/\/www.marcorubber.com\/blog\/?p=1163","title":{"rendered":"Elastomer Seal Materials for Oil &#038; Gas: Subsea, Sour Gas, and Refinery Service"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Oil and gas seal materials often work where failure is hardest to fix. Subsea equipment, sour wells, and refinery units combine high pressure, extreme temperatures, and aggressive fluids. In addition, replacing a seal can mean pulling equipment or shutting down a unit. This article explains which compounds resist explosive decompression, H2S, and high-temperature refinery service. It also covers how material choice and hardware design work together to prevent extrusion. For a complete overview of seal materials, visit our <a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1135\">Complete Guide to Elastomer Seal Materials<\/a>.<\/span><\/p>\n<h2><strong>Oil and Gas Seal Materials<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Oil and gas seals combine high pressure, wide temperature swings, and aggressive fluids. In addition, access for replacement is often difficult or impossible. Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/oil-gas-o-ring-seal-industry.htm\" target=\"_blank\" rel=\"noopener\">oil and gas sealing page<\/a> and <a href=\"https:\/\/www.marcorubber.com\/high-pressure-o-rings.htm\" target=\"_blank\" rel=\"noopener\">High Pressure O-Ring Material Selection Guide<\/a> cover the full range.<\/span><\/p>\n<h3><strong>Best O-Ring and Seal Materials for Subsea Oil and Gas Equipment<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Subsea oil and gas equipment sits in cold seawater under high pressure for years. Therefore, subsea seals need three things: low-temperature flexibility, rapid gas decompression (RGD) resistance, and long-term compression set resistance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The best subsea options include:<\/span><\/p>\n<ul>\n<li><strong>Low-temperature FKM:<\/strong> Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1160\" target=\"_blank\" rel=\"noopener\">V1160<\/a> is an XLT ultra-low-temperature FKM rated down to -50\u00b0F (-46\u00b0C). It is NORSOK and NACE tested for explosive decompression. Similarly, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1090\" target=\"_blank\" rel=\"noopener\">V1090<\/a> is a GLT-type FKM rated to -40\u00b0F (-40\u00b0C).<\/li>\n<li><strong>HNBR: <\/strong>Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/R1008\" target=\"_blank\" rel=\"noopener\">R1008<\/a> is a 90-durometer HNBR tested to NORSOK M-710 for explosive decompression.<\/li>\n<li><strong>FDA silicone:<\/strong> handles baking and freezing temperatures and is odorless. However, it wears quickly in dynamic seals.<\/li>\n<li><strong>Low-temperature FFKM:<\/strong> <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1322\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1322<\/a> pairs AED resistance with a -50\u00b0F (-46\u00b0C) low-temperature rating. As a result, it offers the best overall mix of temperature range and chemical resistance.<\/li>\n<\/ul>\n<h3><strong>Rubber Materials with the Best Extrusion Resistance for Explosive Decompression and High Pressure<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Most O-rings are designed for up to 1500 psi, or a maximum clearance gap of .040 inches. Above those conditions, or with a combination of high pressure and a large gap, the seal compound must be a more extrusion resistant grade.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Additionally, rapid pressure drops let dissolved gas expand inside the seal and cause blisters or splits. Under these conditions, choose hard, AED-rated compounds. Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1090\" target=\"_blank\" rel=\"noopener\">V1090<\/a>, for instance, is a 90-durometer FKM built for greater extrusion resistance. When chemical and heat extremes are also a concern, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1412\" target=\"_blank\" rel=\"noopener\">Markez Z1412<\/a> is a 90-durometer FFKM with NORSOK M-710 AED resistance.<\/span><br \/>\n<span style=\"font-weight: 400;\">Material alone is rarely enough, though. Pair these compounds with tight clearances and <a href=\"https:\/\/www.marcorubber.com\/o-ring-backup-rings.htm\" target=\"_blank\" rel=\"noopener\">O-ring backup rings<\/a>. For the most extreme pressures, consider <a href=\"https:\/\/www.marcorubber.com\/spring-energized-seals.htm\" target=\"_blank\" rel=\"noopener\">metal spring-energized PTFE seals<\/a>.<\/span><\/p>\n<h3><strong>Sealing Materials That Withstand H2S and Sour Gas<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Hydrogen sulfide attacks many elastomers. Furthermore, sour wells often contain amine corrosion inhibitors and steam, which degrade standard FKM and NBR.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For sour service, three choices stand out. First, FFKM offers the broadest resistance. <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1412\" target=\"_blank\" rel=\"noopener\">Markez Z1412<\/a> provides excellent resistance to sour gas, associated chemicals, and steam up to 590\u00b0F (310\u00b0C). Second, <a href=\"https:\/\/www.marcorubber.com\/aflas-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Aflas\u00ae (FEPM)<\/a> resists amines, bases, and steam at lower cost. Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/L1009\" target=\"_blank\" rel=\"noopener\">L1009<\/a> is an AED-tested Aflas rated to 482\u00b0F (250\u00b0C). V1090 has excellent explosive decompression resistance and performance in low-temperature high-pressure environments. Third, base-resistant FKM (Marco <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/L1010\" target=\"_blank\" rel=\"noopener\">L1010<\/a>) tolerates up to 40% H2S, compared with only 2% for standard Type A FKM. By comparison, Aflas is rated to 20% H2S.<\/span><\/p>\n<h3><strong>Best Sealing Materials to Prevent Failure in High-Temperature Refinery Applications<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Refinery seals see hot hydrocarbons, steam, and process chemicals, often with thermal cycling. Consequently, compression set and heat aging are the main failure modes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">FFKM perfluoroelastomer is the top choice above 450\u00b0F. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1028\" target=\"_blank\" rel=\"noopener\">Markez Z1028<\/a> handles up to 610\u00b0F (321\u00b0C) with wide chemical compatibility. It is used in petrochemical service as an alternative to Kalrez\u00ae 6375, 4079, and 7075. For even hotter points, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z2000\" target=\"_blank\" rel=\"noopener\">Z2000<\/a> extends to 630\u00b0F (330\u00b0C). Below 450\u00b0F, Aflas and high-performance FKM offer a lower-cost option. Explore Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/high-temperature-seals\" target=\"_blank\" rel=\"noopener\">high temperature O-rings<\/a> for more choices.<\/span><\/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=1167\" target=\"_blank\" rel=\"noopener\">Chemical-Resistant Seals for Aggressive Solvents in Chemical Processing<\/a><\/span><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1173\" target=\"_blank\" rel=\"noopener\">Aerospace &amp; Defense: MIL-SPEC O-Ring Materials for Fuel, Hydraulics, and Cold<\/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>Oil and gas seal materials often work where failure is hardest to fix. Subsea equipment, sour wells, and refinery units combine high pressure, extreme temperatures, and aggressive fluids. In addition, replacing a seal can mean pulling equipment or shutting down a unit. This article explains which compounds resist explosive decompression, H2S, and high-temperature refinery service. [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":1169,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1163","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>Oil and Gas Seal Materials: Subsea, Sour Gas &amp; Refinery<\/title>\n<meta name=\"description\" content=\"Choose oil and gas seal materials that resist explosive decompression, H2S, and refinery heat, from low-temp FKM and HNBR to FFKM.\" \/>\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=1163\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oil and Gas Seal Materials: Subsea, Sour Gas &amp; 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