{"id":1107,"date":"2026-10-01T09:10:49","date_gmt":"2026-10-01T09:10:49","guid":{"rendered":"https:\/\/www.marcorubber.com\/blog\/?p=1107"},"modified":"2026-10-01T16:17:09","modified_gmt":"2026-10-01T16:17:09","slug":"aerospace-seal-materials-a-fluid-by-fluid-guide-from-jet-fuel-to-hypergolic-propellants","status":"publish","type":"post","link":"https:\/\/www.marcorubber.com\/blog\/?p=1107","title":{"rendered":"Aerospace Seal Materials: A Fluid-by-Fluid Guide from Jet Fuel to Hypergolic Propellants"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Choosing aerospace seal materials starts with one question: what fluid will the seal touch? Some fluids are mild, like petroleum hydraulic oil. Others, like hypergolic propellants, attack almost every elastomer. As a result, the wrong choice can lead to swelling, cracking, or leaks.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This guide walks through three common fluid groups:<\/span><\/p>\n<ul>\n<li>Aviation hydraulic fluids<\/li>\n<li>Jet fuels<\/li>\n<li>Hypergolic rocket propellants<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">For each one, we cover which aerospace seal materials fit and why. We also share NASA test data for the toughest group. Finally, we cover design factors that apply across all three.<\/span><\/p>\n<h3>Quick Selection Table<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin: 20px 0;\">\n<thead>\n<tr style=\"background-color: #004588; color: #ffffff; text-align: left;\">\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Fluid Group<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Typical Material Family<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Compounds to Consider<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Aviation hydraulic fluid<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Nitrile (NBR), FKM, FFKM<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1000\" target=\"_blank\" rel=\"noopener\">M1000<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1001\" target=\"_blank\" rel=\"noopener\">M1001<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1002\" target=\"_blank\" rel=\"noopener\">M1002<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1002\" target=\"_blank\" rel=\"noopener\">V1002<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1004\" target=\"_blank\" rel=\"noopener\">V1004<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1005\" target=\"_blank\" rel=\"noopener\">V1005<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/z1217\" target=\"_blank\" rel=\"noopener\">Z1217<\/a><\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Jet fuel<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Fluorosilicone (FVMQ)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/f1001\" target=\"_blank\" rel=\"noopener\">F1001<\/a><\/span>, <span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/f1002\" target=\"_blank\" rel=\"noopener\">F1002<\/a><\/span>, <span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/f1003\" target=\"_blank\" rel=\"noopener\">F1003<\/a><\/span>, <span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/f1004\" target=\"_blank\" rel=\"noopener\">F1004<\/a><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Hypergolic propellants (MON-3, MMH)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">FFKM<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\"><strong>Simriz\u00ae 486<\/strong><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Use this table as a starting point. Then confirm the details below for your specific application.<\/span><\/p>\n<h2><strong>Aviation Hydraulic Fluids: MIL-SPEC Compounds<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Military and aerospace hydraulic systems usually call out a specific material spec. Therefore, the first step is to match the spec on your drawing.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Marco offers several compounds for these systems:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1000\" target=\"_blank\" rel=\"noopener\">M1000<\/a>: A 70 durometer nitrile made to MIL-P-25732, suited to military aircraft hydraulics at low temperatures.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1001\" target=\"_blank\" rel=\"noopener\">M1001<\/a>: A 75 durometer, peroxide-cured nitrile made to AMS-P-83461.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1002\" target=\"_blank\" rel=\"noopener\">M1002<\/a>: A nitrile made to AMS-P-5315, used for MS29513 and MS29512 boss and tube sizes.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1002\" target=\"_blank\" rel=\"noopener\">V1002<\/a>: A 75 durometer black FKM made to AMS-7276 and MIL-R-83248C.<br \/>\n<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>: Additional FKM options for higher-temperature hydraulic service.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/z1217\" target=\"_blank\" rel=\"noopener\">Z1217<\/a>: <a href=\"https:\/\/www.marcorubber.com\/markez-ffkm.htm\" target=\"_blank\" rel=\"noopener\">A Markez\u00ae FFKM<\/a> for jet engine and APU applications that meets AMS-7257.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For the full list of specs, see Marco&#8217;s O-ring Mil-Spec chart.<\/span><\/p>\n<h2><strong>Jet Fuel: Fluorosilicone Compounds<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Jet fuel calls for a different material. Fluorosilicone is a common choice. It combines fuel resistance with strong low-temperature flexibility.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Marco&#8217;s jet fuel compounds include <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/f1001\" target=\"_blank\" rel=\"noopener\">F1001<\/a>, <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>. 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, with jet fuel resistance and a range of -100 \u00b0F to 350 \u00b0F.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, fluorosilicone has limits. Marco&#8217;s fluorosilicone datasheets list hydrazine among the material&#8217;s limitations. In other words, a seal that works well in jet fuel can fail in a rocket propellant system. That brings us to the most demanding fluid group.<\/span><\/p>\n<h2><strong>Hypergolic Propellants: The Toughest Test for Seals<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Hypergolic systems pair a fuel with an oxidizer. The two ignite on contact, with no spark needed. This makes them reliable for thrusters and orbital maneuvering. Yet the same reactivity makes them punishing for hypergolic fuel seals.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Common hypergolic media include:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">MON-3 (Mixed Oxides of Nitrogen): A mixture of dinitrogen tetroxide and nitrogen dioxide. It is a strong oxidizer.<br \/>\nMMH (Monomethyl Hydrazine): A hydrazine-based fuel that attacks many common rubber compounds.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These fluids are extremely hazardous. Most commercial labs cannot safely run immersion tests in them. For this reason, independent NASA data is especially valuable.<\/span><\/p>\n<h2><strong>The Standout Material: Freudenberg-NOK Simriz\u00ae 486<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a> is a white, 75 Shore A FFKM compound from <a href=\"https:\/\/www.fst.com\/\" target=\"_blank\" rel=\"noopener\">Freudenberg-NOK Sealing Technologies<\/a>. It was engineered for aggressive oxidizer and fuel environments. Most importantly, it has NASA test data to back it up.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When samples of <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a> were submitted to the <a href=\"https:\/\/www.nasa.gov\/white-sands-test-facility\/\" target=\"_blank\" rel=\"noopener\">NASA White Sands test facility<\/a>,\u00a0the results were clear:<\/span><\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin: 20px 0;\">\n<thead>\n<tr style=\"background-color: #004588; color: #ffffff; text-align: left;\">\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Test Medium<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Exposure Conditions<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Result<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">MON-3<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">48 h @ +71 \u00b0C (+160 \u00b0F)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Minor color change, no deterioration of other properties<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">MMH<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">48 h @ +71 \u00b0C (+160 \u00b0F)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">No color change, no deterioration of other properties<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">In short, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a> is good for use in both media. Consequently, NASA gave it an &#8220;A&#8221; compatibility rating in MON-3 and MMH. The material also meets the requirements of NASA-STD-6001B Test 15 with no chemical changes.<\/span><\/p>\n<h3><strong>Simriz\u00ae 486 Properties<\/strong><\/h3>\n<table style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin: 20px 0;\">\n<thead>\n<tr style=\"background-color: #004588; color: #ffffff; text-align: left;\">\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Property<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Hardness (DIN ISO 7619-1, Shore A, 23 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">75<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Temperature range<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-7 \u00b0C to +230 \u00b0C (+20 \u00b0F to +446 \u00b0F)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Tensile strength<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">18.5 MPa (2,690 psi)<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Elongation<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">195%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Compression set (70 h at 204 \u00b0C \/ 400 \u00b0F, ASTM D395 Method B)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">23%<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Color<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">White<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Low compression set matters here. It means the seal holds its sealing force longer. As a result, service life improves and replacement intervals shrink.<\/span><\/p>\n<h3><strong>Chemical Resistance Beyond Propellants<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a> also resists many other fluids. The datasheet rates it &#8220;++&#8221; (excellent) in:<\/span><\/p>\n<ul>\n<li>Dinitrogen tetroxide and hydrazine isomers<\/li>\n<li>Hot water and steam<\/li>\n<li>Alkalis, bases, amines, and hot amines<\/li>\n<li>Ketones, esters, ethers, and aldehydes<\/li>\n<li>Hot lubricants, synthetic oils, fluorinated fluids, and alcohols<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It is rated &#8220;+&#8221; (good) in dry heat and inorganic acids such as nitric acid. Therefore, one compound can often serve both the flight system and its ground support equipment.<\/span><\/p>\n<h3><strong>Where Simriz\u00ae 486 Fits<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Typical applications include:<\/span><\/p>\n<ul>\n<li>Satellite propulsion and orbital maneuvering systems<\/li>\n<li>Rocket engine support systems<\/li>\n<li>Propellant valves and pressure regulators<\/li>\n<li>Thruster assemblies<\/li>\n<li>Fuel and oxidizer handling equipment<\/li>\n<li>Propellant transfer systems and ground support equipment<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">One note: the low limit is -7 \u00b0C (+20 \u00b0F), so confirm that your mission profile and cold-soak conditions stay in range.<\/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-1118\" src=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/09\/SIMRIZ-486-Quote-Banner.jpg\" alt=\"Simriz\u00ae 486 for Hypergolic Rocket Fuels - Request a quote\" width=\"1024\" height=\"280\" srcset=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/09\/SIMRIZ-486-Quote-Banner.jpg 1024w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/09\/SIMRIZ-486-Quote-Banner-300x82.jpg 300w, https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/09\/SIMRIZ-486-Quote-Banner-768x210.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<h2><strong>Design Factors for <\/strong><strong>Aerospace Seal Materials <\/strong><strong>That Apply to Every Fluid<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">The right aerospace seal material is only half the job. Next, the gland design has to support it.<\/span><\/p>\n<h3><strong>Preventing O-Ring Extrusion<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Extrusion is a common failure in high-pressure aerospace systems. It usually comes from three causes:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Incorrect hardness:<\/strong> A soft compound may not resist the pressure.<\/span><br \/>\n<span style=\"font-weight: 400;\"><strong>High pressure:<\/strong> Pressure pushes the O-ring into the clearance gap.<\/span><br \/>\n<span style=\"font-weight: 400;\"><strong>Excessive extrusion gap:<\/strong> Loose tolerances give the O-ring room to escape.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To address this, start with correct gland dimensions. <a href=\"https:\/\/www.marcorubber.com\/o-ring-groove-design-directory.htm\" target=\"_blank\" rel=\"noopener\">Marco&#8217;s O-ring groove design directory<\/a> and <a href=\"https:\/\/www.marcorubber.com\/o-ring-groove-design-considerations.htm\" target=\"_blank\" rel=\"noopener\">groove design considerations guide<\/a> cover squeeze, stretch, and fill.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In addition, consider back-up rings. Marco recommends them above 1,500 psi or with large extrusion gaps, since they close or reduce that gap. Learn more on <a href=\"https:\/\/www.marcorubber.com\/o-ring-backup-rings.htm\" target=\"_blank\" rel=\"noopener\">Marco&#8217;s back-up rings page<\/a>.<\/span><\/p>\n<h3><strong>Documentation and Traceability<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Aerospace buyers often need proof, not just performance. Before you qualify a seal, ask your supplier for:<\/span><\/p>\n<ul>\n<li>Material certifications tied to the governing spec<\/li>\n<li>Lot traceability back to the compound batch<\/li>\n<li>Fluid compatibility data for your actual media<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Finally, always test the finished part in your application. Lab data is a starting point, not a guarantee.<\/span><\/p>\n<h2><strong>Sourcing Aerospace Seals and Materials Through Marco\u00a0<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Marco Sealing Solutions is an approved Freudenberg-NOK distributor. Freudenberg-NOK Sealing Technologies is the only vertically integrated manufacturer of perfluoroelastomer materials. It controls the full value chain, from monomers to finished seals. This supports consistent quality and traceability for compounds like <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a>.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Freudenberg-NOK&#8217;s Approved Distributor status recognizes distributors that meet its standards for technical competence, service quality, and integrated logistics. Marco also provides engineering and supply support. Read more about what Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/blog\/?p=875\" target=\"_blank\" rel=\"noopener\"> Freudenberg-NOK Approved Distributor Status Means for You<\/a>.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With Marco, you get:<\/span><\/p>\n<ul>\n<li>Stocked <span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z486\" target=\"_blank\" rel=\"noopener\">Simriz\u00ae 486<\/a><\/span> O-rings in AS568 sizes, such as <a href=\"https:\/\/www.marcorubber.com\/product\/Z486-150\" target=\"_blank\" rel=\"noopener\">Z486-150<\/a><\/li>\n<li>MIL-SPEC nitrile, FKM, fluorosilicone, and FFKM compounds in one place<\/li>\n<li>Application engineering and failure analysis support<\/li>\n<li>Access to the full Freudenberg Simriz\u00ae FFKM portfolio<\/li>\n<\/ul>\n<h2><strong>Frequently Asked Questions About Aerospace Seal Materials<\/strong><\/h2>\n<h3>What sealing solutions meet MIL-SPEC requirements for aerospace hydraulic systems?<\/h3>\n<p><span style=\"font-weight: 400;\">Marco offers <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1002\" target=\"_blank\" rel=\"noopener\">V1002<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1004\" target=\"_blank\" rel=\"noopener\">V1004<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1005\" target=\"_blank\" rel=\"noopener\">V1005<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1000\" target=\"_blank\" rel=\"noopener\">M1000<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1001\" target=\"_blank\" rel=\"noopener\">M1001<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1002\" target=\"_blank\" rel=\"noopener\">M1002<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/z1217\" target=\"_blank\" rel=\"noopener\">Z1217<\/a>. Each matches a specific AMS or MIL spec. See the hydraulic fluid section above for details.<\/span><\/p>\n<h3>Which rubber compounds are rated for jet fuel and aviation hydraulic fluid exposure?<\/h3>\n<p><span style=\"font-weight: 400;\">For aerospace seal materials compatible with jet fuel, consider fluorosilicones <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/f1001\" target=\"_blank\" rel=\"noopener\">F1001<\/a>, <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>. For hydraulic fluid, consider <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1002\" target=\"_blank\" rel=\"noopener\">V1002<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1004\" target=\"_blank\" rel=\"noopener\">V1004<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/v1005\" target=\"_blank\" rel=\"noopener\">V1005<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1000\" target=\"_blank\" rel=\"noopener\">M1000<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1001\" target=\"_blank\" rel=\"noopener\">M1001<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/m1002\" target=\"_blank\" rel=\"noopener\">M1002<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/z1217\" target=\"_blank\" rel=\"noopener\">Z1217<\/a>.<\/span><\/p>\n<h3>What causes O-ring extrusion in high-pressure hydraulic aerospace systems?<\/h3>\n<p><span style=\"font-weight: 400;\">The three main causes are incorrect hardness, high pressure, and an excessive extrusion gap. Proper groove design and back-up rings help prevent it. For example, Marco stocks PTFE back-up rings in solid, split, and spiral styles to military standards such as MS28774, MS27595, MS28782, and MS28783. Marco also offers contoured 90 durometer nitrile and FKM back-up rings in AS568 sizes. Need something different? Custom sizes and materials can be made to order, so <a href=\"https:\/\/www.marcorubber.com\/o-ring-backup-rings.htm\">contact Marco<\/a> for selection and design help.<\/span><\/p>\n<h3>Which seal material works in nitrogen tetroxide and hydrazine?<\/h3>\n<p><span style=\"font-weight: 400;\">Simriz\u00ae 486 FFKM. NASA testing showed no deterioration of properties in MON-3 or MMH. As a result, it earned an &#8220;A&#8221; rating in both.<\/span><\/p>\n<h3>Can I use a jet fuel O-ring in a hydrazine system?<\/h3>\n<p><span style=\"font-weight: 400;\">Usually not. Fluorosilicone handles jet fuel well, but hydrazine is a known limitation. Instead, choose a material with hypergolic test data, such as Simriz\u00ae 486.<\/span><\/p>\n<h2><strong>Need Help Matching a Material to Your Fluid?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Every aerospace fluid brings its own challenges. Fortunately, you don&#8217;t have to sort through them alone. Marco&#8217;s engineers can help you match the right compound to your system, from hydraulic lines to thrusters.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Request a quote for Simriz\u00ae 486 or contact Marco&#8217;s engineering team to discuss your needs and find the right aerospace seal materials for your application.<\/span><\/p>\n<p><a href=\"https:\/\/www.marcorubber.com\/inquiry-quote.htm\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1053 size-full\" 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<p><em><span style=\"color: #999999;\">The information contained herein is believed to be reliable, but no representations, warranties or guarantees of any kind are made as to its accuracy or suitability for any purpose. The information is based on laboratory testing and is not necessarily indicative of the performance of the final product. The user is responsible for performing complete testing and for the performance of the final product.<\/span><\/em><\/p>\n<hr \/>\n<h3>Related Reading<\/h3>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/o-ring-mil-specs-chart.htm\" target=\"_blank\" rel=\"noopener\">MIL Spec Compounds<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/o-ring-groove-design-directory.htm\" target=\"_blank\" rel=\"noopener\">Groove Design Guide Directory<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/o-ring-backup-rings.htm\" target=\"_blank\" rel=\"noopener\">Back-Up O-Rings Designed for Higher-Pressure Applications<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/blog\/?p=875\" target=\"_blank\" rel=\"noopener\">Freudenberg-NOK Approved Distributor Status: What It Means for You<\/a><br \/>\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Choosing aerospace seal materials starts with one question: what fluid will the seal touch? Some fluids are mild, like petroleum hydraulic oil. Others, like hypergolic propellants, attack almost every elastomer. As a result, the wrong choice can lead to swelling, cracking, or leaks. This guide walks through three common fluid groups: Aviation hydraulic fluids Jet [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":1117,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1107","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 Seal Materials Guide: Jet Fuel to Hypergolics<\/title>\n<meta name=\"description\" content=\"Match aerospace seal materials to hydraulic fluid, jet fuel, and hypergolic propellants. 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