{"id":1213,"date":"2026-06-05T09:42:37","date_gmt":"2026-06-05T09:42:37","guid":{"rendered":"https:\/\/www.marcorubber.com\/blog\/?p=1213"},"modified":"2026-11-06T18:04:55","modified_gmt":"2026-11-06T18:04:55","slug":"silicone-o-rings-temperature-range-applications-benefits-limitations","status":"publish","type":"post","link":"https:\/\/www.marcorubber.com\/blog\/?p=1213","title":{"rendered":"Silicone O-Rings: Temperature Range, Applications, Benefits &#038; Limitations"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Are <a href=\"https:\/\/www.marcorubber.com\/silicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">silicone O-rings<\/a> the right seal for your application? Silicone handles extreme heat and cold better than most elastomers. As a result, silicone O-rings are a common choice in medical devices, food processing equipment, electronics, and outdoor equipment.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, silicone is not a universal answer. It has clear limits with fuels, oils, abrasion, and high-pressure steam. Therefore, you should understand its properties, limitations, and compatibility before you specify it. In addition, if you work in the medical field, you&#8217;ll need to know how medical-grade silicone differs from standard silicone.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This guide walks through:<\/span><\/p>\n<ul>\n<li>Key properties of silicone (VMQ) and Marco&#8217;s silicone compounds<\/li>\n<li>Temperature range, advantages, and limitations<\/li>\n<li>Common applications by industry<\/li>\n<li>The difference between medical-grade and standard silicone O-rings<\/li>\n<li>How silicone compares to Viton\u00ae, EPDM, Buna-N, and FFKM<\/li>\n<li>Chemical compatibility, FDA requirements, and selection tips<\/li>\n<\/ul>\n<h3>Quick Reference: Silicone O-Rings at a Glance<\/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\">Typical Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Material<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Silicone rubber (VMQ, also called PVMQ)<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Standard temperature range<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +400 \u00b0F (-54 \u00b0C to +204 \u00b0C)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Specialty grade range<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-103 \u00b0F to +500 \u00b0F (-75 \u00b0C to +260 \u00b0C)<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Common hardness<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70 Shore A standard; softer and harder grades available<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Compliance options<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">FDA 21 CFR 177.2600, USP Class VI, 3-A, NSF 51<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Best with<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Dry heat, wide temperature swings, ozone, UV, water, animal and vegetable oils<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Avoid<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Petroleum oils and fuels, ketones, acids, alkalis, brake fluids, abrasion, steam over 250 \u00b0F<\/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>What Are Silicone O-Rings?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Silicone O-rings, often called VMQ O-rings, are seals made from silicone rubber elastomers. VMQ is the ASTM designation for silicone materials used in sealing. In fact, the term silicone covers a large group of materials in which vinyl-methyl-silicone (VMQ) is often the central ingredient.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Unlike many traditional elastomers, silicone stays elastic across an exceptionally wide temperature range. For this reason, silicone O-rings work well where seals face extreme heat, freezing temperatures, UV exposure, ozone, and weathering.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Silicone compounds also come in FDA-compliant and medical-grade formulations. As a result, they are a popular choice for sanitary and sensitive applications. Learn more in Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/silicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Silicone O-Rings Selection Guide<\/a>.<\/span><\/p>\n<h2><strong>Key Properties of Silicone (VMQ) O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Silicone O-rings combine environmental resistance with temperature stability. Here are the most notable properties.<\/span><\/p>\n<h3><strong>Excellent Temperature Resistance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone performs well in both high- and low-temperature environments. Standard silicone O-rings typically operate from -65 \u00b0F to +400 \u00b0F (-54 \u00b0C to +204 \u00b0C). For example, Marco&#8217;s general-purpose <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a> is rated from -75 \u00b0F to +400 \u00b0F (-59 \u00b0C to +204 \u00b0C).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Specialized compounds extend beyond these limits. For instance, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1015\" target=\"_blank\" rel=\"noopener\">S1015<\/a> reaches +500 \u00b0F (+260 \u00b0C), and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1043\" target=\"_blank\" rel=\"noopener\">S1043<\/a> stays flexible down to -103 \u00b0F (-75 \u00b0C).<\/span><\/p>\n<h3><strong>Outstanding Ozone and UV Resistance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone strongly resists ozone, ultraviolet light, oxidation, and weathering. Therefore, it is an excellent material for outdoor and long-term environmental exposure. Ozone resistance matters most in sunlight, near electrical equipment, and in changing atmospheric conditions.<\/span><\/p>\n<h3><strong>Flexible and Elastic<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone stays flexible even in extremely cold temperatures. As a result, the seal remains where other elastomers become brittle. Silicone also shows outstanding flex and fatigue life. In severe environments, choosing the right material is essential to reliable sealing.<\/span><\/p>\n<h3><strong>Wide Range of Hardness<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone is made in a wide range of durometers, from very soft to very hard. Most standard silicone O-rings are 70 Shore A. However, softer grades help in some cases. For example, 40 durometer <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1004\" target=\"_blank\" rel=\"noopener\">S1004<\/a> seals rough or warped glands and low closure force designs.<\/span><\/p>\n<h3><strong>Available in Multiple Colors<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone doesn&#8217;t require carbon black, so it is easy to color. The industry-standard color is rust red or orange. In addition, silicone compounds are commonly available in:<\/span><\/p>\n<ul>\n<li>Red\/orange<\/li>\n<li>Clear\/translucent<\/li>\n<li>White<\/li>\n<li>Black<\/li>\n<li>Blue<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Color options are especially useful in food processing, medical, and product identification applications.<\/span><\/p>\n<h3><strong>FDA and Medical Grade Availability<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Many silicone compounds comply with FDA 21 CFR 177.2600 for food contact. Others are tested to USP Class VI for medical and pharmaceutical use. See the <a href=\"https:\/\/www.marcorubber.com\/medical-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Medical &amp; Pharma Sealing Guide<\/a> and the medical-grade section below for details.<\/span><\/p>\n<h3><strong>Marco&#8217;s Silicone O-Ring Compounds<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Marco stocks a broad range of <a href=\"https:\/\/www.marcorubber.com\/silicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">silicone compounds<\/a>. Each one is built for a specific need:<\/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\">Compound<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Durometer (Shore A)<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Color<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Temperature Range<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Key Feature \/ Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Orange<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-75 \u00b0F to +400 \u00b0F (-59 \u00b0C to +204 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">General purpose; FDA compliant (21 CFR 177.2600)<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1004\" target=\"_blank\" rel=\"noopener\">S1004<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">40<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Orange<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-75 \u00b0F to +400 \u00b0F (-59 \u00b0C to +204 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Softer grade for rough glands and low closure force<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1015\" target=\"_blank\" rel=\"noopener\">S1015<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Orange<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +500 \u00b0F (-54 \u00b0C to +260 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Higher temperature resistance<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1043\" target=\"_blank\" rel=\"noopener\">S1043<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">50<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Orange<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-103 \u00b0F to +400 \u00b0F (-75 \u00b0C to +204 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Lower temperature resistance<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1020\" target=\"_blank\" rel=\"noopener\">S1020<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Clear<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +400 \u00b0F (-54 \u00b0C to +204 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Clear-translucent; FDA compliant (21 CFR 177.2600)<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1146\" target=\"_blank\" rel=\"noopener\">S1146<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">White<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-75 \u00b0F to +480 \u00b0F (-59 \u00b0C to +249 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Medical grade; USP Class VI and FDA; platinum cured<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1083\" target=\"_blank\" rel=\"noopener\">S1083<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Clear<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +400 \u00b0F (-54 \u00b0C to +204 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Medical grade; USP Class VI and FDA; platinum cured<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">70<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Clear<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +400 \u00b0F (-54 \u00b0C to +204 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Medical grade; USP Class VI and FDA; platinum cured; cleanroom manufactured<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1081\" target=\"_blank\" rel=\"noopener\">S1081<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">65<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Orange<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +350 \u00b0F (-54 \u00b0C to +177 \u00b0C)<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">EMI\/RFI shielding; nickel-coated graphite filled<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Temperature ranges are approximations for dry air service only. Don&#8217;t use them as design specifications.<\/span><\/p>\n<h2><strong>Silicone O-Ring Temperature Range<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Temperature resistance is one of the main reasons engineers choose silicone O-rings. In fact, few widely available elastomers stay this flexible across such a wide range.<\/span><\/p>\n<h3><strong>High-Temperature Performance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone keeps its sealing properties at temperatures where <a href=\"https:\/\/www.marcorubber.com\/buna-n-o-rings.htm\/\" target=\"_blank\" rel=\"noopener\">Buna-N O-rings<\/a> may harden or fail. It is especially strong in dry heat. As a result, silicone suits:<\/span><\/p>\n<ul>\n<li>Heating systems<\/li>\n<li>Industrial ovens<\/li>\n<li>Engine compartments<\/li>\n<li>High-temperature electronics<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">For the hottest service, consider <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1015\" target=\"_blank\" rel=\"noopener\">S1015<\/a>, rated to +500 \u00b0F. However, dry heat and steam are not the same. Standard silicone is not recommended for steam or superheated water above 250 \u00b0F.<\/span><\/p>\n<h3><strong>Low-Temperature Performance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone also excels in extreme cold. It stays flexible at temperatures that cause other elastomers to crack or lose sealing force. Therefore, silicone O-rings are a strong fit for:<\/span><\/p>\n<ul>\n<li>Outdoor equipment<\/li>\n<li>Refrigeration systems<\/li>\n<li>Cold-weather machinery<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Material selection is especially important for long-term reliability in severe cold. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1043\" target=\"_blank\" rel=\"noopener\">S1043<\/a> is rated down to -103 \u00b0F (-75 \u00b0C).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keep in mind that published ranges assume dry air. Pressure, media, and thermal cycling all narrow the real-world range. In short, test in your actual operating conditions.<\/span><\/p>\n<h2><strong>Advantages of Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Silicone O-rings offer several benefits that make them a preferred seal across many industries.<\/span><\/p>\n<h3><strong>Wide Operating Temperature Range<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone performs reliably across one of the broadest temperature ranges of any elastomer.<\/span><\/p>\n<h3><strong>Superior Weather Resistance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone offers excellent resistance to:<\/span><\/p>\n<ul>\n<li>UV exposure<\/li>\n<li>Ozone<\/li>\n<li>Oxidation<\/li>\n<li>Moisture<\/li>\n<li>Environmental aging<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">As a result, silicone is one of the best choices for outdoor sealing and long-term environmental exposure. It also resists fungal and biological attack.<\/span><\/p>\n<h3><strong>Excellent Flexibility<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone stays flexible and compressible, even after prolonged exposure to extreme temperatures.<\/span><\/p>\n<h3><strong>Food and Medical Compatibility<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">FDA-compliant and medical-grade silicone compounds are available for sanitary applications. In addition, silicone is odorless and non-toxic, so it suits clean, sensitive environments.<\/span><\/p>\n<h3><strong>Electrical Insulation Properties<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone is a good electrical insulator. Therefore, it is common in electrical and electronic applications. Conductive grades also exist. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1081\" target=\"_blank\" rel=\"noopener\">S1081<\/a> provides EMI\/RFI shielding, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1173\" target=\"_blank\" rel=\"noopener\">S1173<\/a> is a conductive silicone filled with nickel-coated aluminum.<\/span><\/p>\n<h2><strong>Limitations of Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Silicone O-rings offer many advantages. However, they also have limitations you should weigh during material selection.<\/span><\/p>\n<h3><strong>Poor Abrasion and Tear Resistance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone has relatively low tensile strength and tear resistance compared to <a href=\"https:\/\/www.marcorubber.com\/viton-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Viton\u00ae O-rings<\/a> or polyurethane. For this reason, it is generally not recommended for dynamic applications involving:<\/span><\/p>\n<ul>\n<li>Abrasion<\/li>\n<li>Friction<\/li>\n<li>Reciprocating motion<\/li>\n<li>High mechanical stress<\/li>\n<\/ul>\n<h3><strong>Limited Fuel and Oil Resistance<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone performs poorly when exposed to:<\/span><\/p>\n<ul>\n<li>Petroleum oils<\/li>\n<li>Fuels<\/li>\n<li>Hydrocarbon solvents<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In these environments, <a href=\"https:\/\/www.marcorubber.com\/viton-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Viton\u00ae O-rings<\/a> or <a href=\"https:\/\/www.marcorubber.com\/buna-n-o-rings.htm\/\" target=\"_blank\" rel=\"noopener\">Buna-N O-rings<\/a> are often better suited. If you need silicone&#8217;s cold flexibility with fuel resistance, consider fluorosilicone, such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/F1001\" target=\"_blank\" rel=\"noopener\">F1001<\/a>.<\/span><\/p>\n<h3><strong>Compression Set and Pressure Limits<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone generally offers excellent compression set resistance in static, high-heat service. However, its low strength is a concern in some high-pressure or long-term sealing applications. Under heavy load, silicone can extrude or deform faster than stronger elastomers. In those cases, use a harder grade, <a href=\"https:\/\/www.marcorubber.com\/o-ring-backup-rings.htm\" target=\"_blank\" rel=\"noopener\">back-up rings<\/a>, or another material.<\/span><\/p>\n<h3><strong>Steam and Gas Permeability<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Standard silicone is not recommended for steam or superheated water above 250 \u00b0F. In addition, silicone has high gas permeability. Therefore, it may not suit vacuum or tight gas-sealing applications. Lab data is a starting point, not a guarantee.<\/span><\/p>\n<h2><strong>Common Applications for Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Thanks to their temperature stability and environmental resistance, silicone O-rings serve a wide range of industries.<\/span><\/p>\n<h3><strong>Food Processing Equipment<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">FDA-compliant silicone O-rings are common in:<\/span><\/p>\n<ul>\n<li>Beverage systems<\/li>\n<li>Food handling equipment<\/li>\n<li>Dairy processing<\/li>\n<li>Packaging machinery<\/li>\n<\/ul>\n<h3><strong>Electronics and Electrical Systems<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone&#8217;s insulating properties make it useful for:<\/span><\/p>\n<ul>\n<li>Electrical enclosures<\/li>\n<li>Connectors<\/li>\n<li>Outdoor lighting<\/li>\n<li>Electronic sealing systems<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">For shielding needs, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1081\" target=\"_blank\" rel=\"noopener\">S1081<\/a> combines a silicone seal with EMI\/RFI protection.<\/span><\/p>\n<h3><strong>Outdoor and Environmental Equipment<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Because of its weather resistance, silicone is often selected for:<\/span><\/p>\n<ul>\n<li>Outdoor machinery<\/li>\n<li>Solar equipment<\/li>\n<li>Marine electronics<\/li>\n<li>Weather-exposed systems<\/li>\n<\/ul>\n<h3><strong>Medical Devices<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Medical-grade silicone is frequently used in:<\/span><\/p>\n<ul>\n<li>Diagnostic equipment<\/li>\n<li>Fluid transfer systems<\/li>\n<li>Pharmaceutical processing<\/li>\n<li>Medical instruments<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">However, &#8220;medical grade&#8221; means more than a label. The next section explains what sets it apart.<\/span><\/p>\n<h2><strong>Medical-Grade vs. Standard Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">What is the difference between medical-grade and standard silicone O-rings? In short, it comes down to testing, purity, and documentation. Both start from the same base polymer. However, medical-grade compounds are tested for biological safety and made under tighter controls. As a result, they cost more, so it pays to know when you need them.<\/span><\/p>\n<h3><strong>What &#8220;Standard&#8221; Silicone Means<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Standard silicone O-rings are general-purpose compounds. Most are peroxide-cured. For example, Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a> is a peroxide-cured, 70 durometer silicone.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Many standard grades also comply with FDA 21 CFR 177.2600 for food contact. In other words, &#8220;standard&#8221; doesn&#8217;t mean unsafe. Instead, it means the compound hasn&#8217;t been tested for biological reactivity.<\/span><\/p>\n<h3><strong>What Makes Silicone O-Rings Medical Grade<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">&#8220;Medical grade&#8221; is not a regulatory term on its own. In practice, it usually means the compound has passed USP Class VI testing. Medical-grade silicone O-rings typically differ from standard grades in five ways:<\/span><\/p>\n<ul>\n<li><strong>Biological testing:<\/strong> USP Class VI covers Chapter &lt;87&gt; in vitro testing and Chapter &lt;88&gt; in vivo testing. ISO 10993 may also apply to patient-contact devices.<\/li>\n<li><strong>Cure system:<\/strong> Many medical grades are platinum-cured. Platinum curing leaves no peroxide by-products, so extractables tend to be lower. However, some peroxide-cured compounds also pass USP Class VI.<\/li>\n<li><strong>Manufacturing environment:<\/strong> Some medical grades are made and packaged in a cleanroom. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a> is cleanroom-manufactured.<\/li>\n<li><strong>Documentation:<\/strong> Device makers often need certificates of compliance and lot traceability. Confirm these requirements before you order.<\/li>\n<li><strong>Ingredients:<\/strong> Some medical materials are free of animal-derived ingredients (ADI-free).<\/li>\n<\/ul>\n<h3><strong>Medical-Grade vs. Standard Silicone at a Glance<\/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\">Factor<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Standard Silicone<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Medical-Grade Silicone<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Typical compliance<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">FDA 21 CFR 177.2600 on many grades<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">FDA 21 CFR 177.2600 plus USP Class VI<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Biological testing<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Usually not tested<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">USP &lt;87&gt; in vitro and &lt;88&gt; in vivo<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Cure system<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Usually peroxide<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Often platinum; some peroxide grades qualify<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Manufacturing<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Commercial<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Commercial or cleanroom, with cleanroom packaging options<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Common colors<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Rust red\/orange<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Clear, white, or blue<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Cost<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Lower<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Higher<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Marco examples<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1004\" target=\"_blank\" rel=\"noopener\">S1004<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1015\" target=\"_blank\" rel=\"noopener\">S1015<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1043\" target=\"_blank\" rel=\"noopener\">S1043<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1083\" target=\"_blank\" rel=\"noopener\">S1083<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1146\" target=\"_blank\" rel=\"noopener\">S1146<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1166\" target=\"_blank\" rel=\"noopener\">S1166<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><strong>Marco&#8217;s Medical-Grade Silicone Compounds<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Marco offers several USP Class VI silicone options for medical and pharmaceutical work:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a>: A 70 durometer, clear, platinum-cured silicone. It is FDA and USP Class VI and cleanroom manufactured.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1083\" target=\"_blank\" rel=\"noopener\">S1083<\/a>: A 70 durometer, clear, platinum-cured silicone. It is FDA and USP Class VI.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1146\" target=\"_blank\" rel=\"noopener\">S1146<\/a>: A 70 durometer, white, platinum-cured silicone rated to +480 \u00b0F. It is FDA and USP Class VI, and it costs less than clear grades.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1166\" target=\"_blank\" rel=\"noopener\">S1166<\/a>: A 50 durometer, blue silicone that is FDA and USP Class VI, formulated for food and pharmaceutical use.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/T1022\" target=\"_blank\" rel=\"noopener\">T1022<\/a>: A PFA-encapsulated silicone that is FDA, USP Class VI, and 3-A, with added chemical resistance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Stocked sizes make it easy to start. For example, <a href=\"https:\/\/www.marcorubber.com\/product\/S1146-121\" target=\"_blank\" rel=\"noopener\">S1146-121<\/a> is an AS568-121 medical-grade O-ring.<\/span><\/p>\n<h3><strong>Sterilizing Medical-Grade Silicone O-Rings<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone handles dry heat sterilization well. It is also used with ethylene oxide, electron beam, and gamma radiation methods. However, steam is harder on silicone. Standard grades aren&#8217;t recommended for steam above 250 \u00b0F, and repeated high-pressure steam shortens seal life.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For frequent autoclave or steam-in-place cycles, consider peroxide-cured EPDM such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/E1080\" target=\"_blank\" rel=\"noopener\">E1080<\/a>. Alternatively, steam-grade FFKM such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1426\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1426<\/a> combines steam resistance with USP Class VI purity. Either way, validate cycle counts in your process.<\/span><\/p>\n<h3><strong>When Medical-Grade Silicone Isn&#8217;t Enough<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Some processes expose seals to aggressive APIs, solvents, or cleaning agents. In those cases, a USP Class VI FFKM is safer. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1318\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1318<\/a> is a white, FDA and USP Class VI FFKM with broad chemical compatibility. See <a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1149\" target=\"_blank\" rel=\"noopener\">Elastomer Seal Materials for Medical Device &amp; Pharmaceutical Processing<\/a> for more options.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Finally, remember that USP Class VI is a material test, not a device approval. Don&#8217;t assume it qualifies a compound for long-term implants. You are still responsible for validating the seal in your finished device.<\/span><\/p>\n<h2><strong>Silicone O-Rings vs. Viton\u00ae, EPDM, Buna-N, and FFKM<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Comparing elastomers helps you find the best seal for your operating environment. Depending on the application, <a href=\"https:\/\/www.marcorubber.com\/silicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">silicone O-rings<\/a>, <a href=\"https:\/\/www.marcorubber.com\/viton-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Viton\u00ae O-rings<\/a>, <a href=\"https:\/\/www.marcorubber.com\/epdm-o-rings.htm\" target=\"_blank\" rel=\"noopener\">EPDM O-rings<\/a>, <a href=\"https:\/\/www.marcorubber.com\/buna-n-o-rings.htm\/\" target=\"_blank\" rel=\"noopener\">Buna-N O-rings<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/markez-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Markez\u00ae FFKM O-rings<\/a> each offer different advantages.<\/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\">Material<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Typical Temperature Range<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Temperature Resistance<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Ozone Resistance<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Fuel Resistance<\/th>\n<th style=\"padding: 10px; border: 1px solid #d0d7de;\" scope=\"col\">Best Applications<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/silicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Silicone (VMQ)<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +400 \u00b0F<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Poor<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Extreme temperatures, food and medical<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/viton-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Viton\u00ae (FKM)<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-15 \u00b0F to +437 \u00b0F<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Fuels, chemicals, harsh fluids<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/epdm-o-rings.htm\" target=\"_blank\" rel=\"noopener\">EPDM<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-65 \u00b0F to +300 \u00b0F<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Good<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Poor<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Water, steam, outdoor use<\/td>\n<\/tr>\n<tr style=\"background-color: #f2f4f7;\">\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/buna-n-o-rings.htm\/\" target=\"_blank\" rel=\"noopener\">Buna-N (NBR)<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">-30 \u00b0F to +250 \u00b0F<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Moderate<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Poor<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Good<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">General industrial oil applications<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\"><a href=\"https:\/\/www.marcorubber.com\/markez-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Markez\u00ae FFKM<\/a><\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">+5 \u00b0F to +550 \u00b0F<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Excellent<\/td>\n<td style=\"padding: 10px; border: 1px solid #d0d7de;\">Aggressive chemicals, highest heat<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Silicone is often the best choice when temperature flexibility and environmental resistance matter more than chemical or abrasion resistance. For a deeper comparison, see Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/o-ring-material-selection-comparison.htm\/\" target=\"_blank\" rel=\"noopener\">O-ring material selection guide<\/a>.<\/span><\/p>\n<h2><strong>Chemical Compatibility of Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Silicone O-rings perform well with:<\/span><\/p>\n<ul>\n<li>Water (below 250 \u00b0F)<\/li>\n<li>Ozone<\/li>\n<li>Oxygen<\/li>\n<li>UV exposure<\/li>\n<li>Animal and vegetable oils and greases<\/li>\n<li>Certain mild chemicals<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">However, silicone is generally not recommended for prolonged exposure to:<\/span><\/p>\n<ul>\n<li>Petroleum-based oils<\/li>\n<li>Gasoline and hydrocarbon fuels<\/li>\n<li>Aromatic hydrocarbons, such as benzene and toluene<\/li>\n<li>Strong acids and alkalis<\/li>\n<li>Ketones, such as MEK<\/li>\n<li>Silicone oils<\/li>\n<li>Brake fluids<\/li>\n<li>Concentrated solvents<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When you need silicone&#8217;s flexibility with better chemical resistance, consider <a href=\"https:\/\/www.marcorubber.com\/teflon-encapsulated-o-rings.htm\" target=\"_blank\" rel=\"noopener\">FEP- or PFA-encapsulated O-rings<\/a> with a silicone core, such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/T1022\" target=\"_blank\" rel=\"noopener\">T1022<\/a>.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Always verify compatibility before you select an elastomer. Start with <a href=\"https:\/\/www.marcorubber.com\/o-ring-chemical-compatibility-chart.htm\/\" target=\"_blank\" rel=\"noopener\">Marco&#8217;s O-ring chemical compatibility guide<\/a>. Then confirm with testing in your actual media.<\/span><\/p>\n<h2><strong>FDA and Food-Grade Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Many industries require seals that comply with FDA regulations for food contact. Silicone is one of the most common elastomers in these environments because it offers:<\/span><\/p>\n<ul>\n<li>Non-toxic material options<\/li>\n<li>Excellent temperature resistance<\/li>\n<li>Easy cleaning and sterilization<\/li>\n<li>Flexible sealing performance<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Food-grade silicone O-rings are frequently used in:<\/span><\/p>\n<ul>\n<li>Food manufacturing<\/li>\n<li>Beverage processing<\/li>\n<li>Pharmaceutical production<\/li>\n<li>Commercial kitchens<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Notably, FDA does not &#8220;approve&#8221; individual seals. Instead, compounds comply with FDA 21 CFR 177.2600, and the manufacturer certifies compliance. Marco&#8217;s FDA-compliant silicone options include:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a>: A 70 durometer, orange, general-purpose silicone. It is FDA compliant per 21 CFR 177.2600.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1020\" target=\"_blank\" rel=\"noopener\">S1020<\/a>: A 70 durometer, clear-translucent silicone. It is FDA compliant per 21 CFR 177.2600.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1189\" target=\"_blank\" rel=\"noopener\">S1189<\/a>: A 70 durometer, clear-translucent silicone. It complies with FDA, 3-A Sanitary, and NSF 51.<br \/>\n<a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1184\" target=\"_blank\" rel=\"noopener\">S1184<\/a>: A 70 durometer, red, FDA silicone that is metal detectable.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For dairy lines, see Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/3a-o-rings-dairy.htm\" target=\"_blank\" rel=\"noopener\">3-A sanitary O-rings<\/a>. In addition, <a href=\"https:\/\/www.marcorubber.com\/metal-detectable-o-rings-sanitary-gaskets.htm\" target=\"_blank\" rel=\"noopener\">metal-detectable O-rings and gaskets<\/a> help inspection systems catch seal fragments. However, silicone wears quickly in dynamic food seals, so match the material to the motion. Learn more in <a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1155\" target=\"_blank\" rel=\"noopener\">Food &amp; Beverage: O-Ring Materials Approved for Direct Food Contact<\/a>.<\/span><\/p>\n<h2><strong>How to Select the Right Silicone O-Rings<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">When you choose silicone O-rings, consider the following factors.<\/span><\/p>\n<h3><strong>Operating Temperature<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Make sure the compound handles both the minimum and maximum application temperatures. Also, separate dry heat from steam, since the limits differ.<\/span><\/p>\n<h3><strong>Chemical Exposure<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Evaluate every fluid, gas, and cleaning chemical the seal may encounter. Next, check each one against the <a href=\"https:\/\/www.marcorubber.com\/o-ring-chemical-compatibility-chart.htm\/\" target=\"_blank\" rel=\"noopener\">chemical compatibility guide<\/a>.<\/span><\/p>\n<h3><strong>Dynamic vs. Static Application<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Silicone is generally better suited to static sealing than dynamic sealing. In addition, follow proper <a href=\"https:\/\/www.marcorubber.com\/o-ring-groove-design-directory.htm\" target=\"_blank\" rel=\"noopener\">O-ring groove design<\/a> to avoid over-compression and extrusion.<\/span><\/p>\n<h3><strong>Regulatory Requirements<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Determine whether you need FDA, USP Class VI, 3-A, NSF, or medical-grade compliance. If you need USP Class VI, choose a tested compound such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a> or <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1146\" target=\"_blank\" rel=\"noopener\">S1146<\/a>.<\/span><\/p>\n<h3><strong>Environmental Conditions<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Consider exposure to UV light, ozone, weathering, and moisture. Fortunately, silicone handles all four well. Even so, field conditions vary, so test before you commit to production.<\/span><\/p>\n<h2><strong>Sourcing Silicone O-Rings Through Marco<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Marco Sealing Solutions stocks silicone O-rings in AS568 and metric sizes across general-purpose, FDA, USP Class VI, and specialty grades. Marco can also custom-make silicone O-rings, often without tooling fees. In addition, Marco is an approved Freudenberg-NOK distributor. Read more about what <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 silicone O-rings in standard sizes, such as <a href=\"https:\/\/www.marcorubber.com\/product\/S1000-011\" target=\"_blank\" rel=\"noopener\">S1000-011<\/a> and <a href=\"https:\/\/www.marcorubber.com\/product\/S1146-121\" target=\"_blank\" rel=\"noopener\">S1146-121<\/a><\/li>\n<li>FDA, USP Class VI, 3-A, NSF 51, metal-detectable, and EMI-shielding silicone compounds in one place<\/li>\n<li>Cleanroom-manufactured medical-grade silicone, such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a><\/li>\n<li><a href=\"https:\/\/www.marcorubber.com\/teflon-encapsulated-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Encapsulated O-rings<\/a> with silicone cores for added chemical resistance<\/li>\n<li><a href=\"https:\/\/www.marcorubber.com\/new-silicone-rubber-products.htm\" target=\"_blank\" rel=\"noopener\">Silicone profiles and cords<\/a> beyond standard O-rings<\/li>\n<li>Access to 3,600+ materials, including Viton\u00ae, EPDM, Buna-N, and <a href=\"https:\/\/www.marcorubber.com\/custom-sealing-solutions.htm\" target=\"_blank\" rel=\"noopener\">custom elastomer solutions<\/a> for OEM and MRO applications<\/li>\n<li>Application engineering support when silicone isn&#8217;t the right fit<\/li>\n<\/ul>\n<h2><strong>Frequently Asked Questions About Silicone O-Rings<\/strong><\/h2>\n<h3>What is the difference between medical-grade and standard silicone o-rings?<\/h3>\n<p><span style=\"font-weight: 400;\">Medical-grade silicone O-rings are tested to USP Class VI for biological reactivity, while standard grades usually are not. Medical grades are often platinum cured, which lowers extractables. Some are also cleanroom manufactured and packaged. Marco&#8217;s medical-grade options include <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1083\" target=\"_blank\" rel=\"noopener\">S1083<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1146\" target=\"_blank\" rel=\"noopener\">S1146<\/a>. By contrast, standard <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a> is FDA compliant but not USP Class VI.<\/span><\/p>\n<h3>What o-ring materials are FDA compliant for use in medical devices?<\/h3>\n<p><span style=\"font-weight: 400;\">Platinum-cured silicone is the most common choice for medical devices. For example, Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a> is FDA compliant, USP Class VI, and cleanroom manufactured. For chemical or high-heat exposure, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1318\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1318<\/a> is a white FFKM that is FDA compliant and USP Class VI. Alternatively, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/E1080\" target=\"_blank\" rel=\"noopener\">E1080<\/a> EPDM offers lower-cost steam resistance and is FDA, 3-A, and USP Class VI.<\/span><\/p>\n<h3>Who supplies USP CL VI o-rings?<\/h3>\n<p><span style=\"font-weight: 400;\">Marco Sealing Solutions supplies USP Class VI O-rings in silicone, EPDM, FFKM, and encapsulated designs. Silicone options include <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1083\" target=\"_blank\" rel=\"noopener\">S1083<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1146\" target=\"_blank\" rel=\"noopener\">S1146<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1166\" target=\"_blank\" rel=\"noopener\">S1166<\/a>. For harsher service, Marco offers <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1318\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1318<\/a>, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1426\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1426<\/a>, and PFA-encapsulated <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/T1022\" target=\"_blank\" rel=\"noopener\">T1022<\/a>. See the <a href=\"https:\/\/www.marcorubber.com\/medical-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Medical &amp; Pharma Sealing Guide<\/a> for the full list.<\/span><\/p>\n<h3>Which elastomers are compatible with steam sterilization and autoclave cycles?<\/h3>\n<p><span style=\"font-weight: 400;\">Peroxide-cured EPDM is the standard for steam and autoclave service. For example, Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/E1000\" target=\"_blank\" rel=\"noopener\">E1000<\/a> is rated to 300 \u00b0F (149 \u00b0C). Steam-resistant FKM such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/V1118\" target=\"_blank\" rel=\"noopener\">V1118<\/a> and steam-grade FFKM such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1352\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1352<\/a> and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1426\" target=\"_blank\" rel=\"noopener\">Z1426<\/a> also work. Silicone suits dry-heat sterilization. However, repeated high-pressure steam shortens its life, so validate cycle counts.<\/span><\/p>\n<h3>Which o-ring suppliers provide lot-level traceability and certificates of conformance for medical device manufacturing?<\/h3>\n<p><span style=\"font-weight: 400;\">Look for a supplier that provides certificates of conformance, lot traceability, and USP Class VI test documentation. Marco supplies medical-grade compounds such as cleanroom-manufactured <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1037\" target=\"_blank\" rel=\"noopener\">S1037<\/a> with compliance documentation on request. Marco also operates under an <a href=\"https:\/\/www.marcorubber.com\/quality-systems.htm\" target=\"_blank\" rel=\"noopener\">ISO 9001 quality management system<\/a>. Confirm your documentation requirements when you <a href=\"https:\/\/www.marcorubber.com\/inquiry-quote.htm\" target=\"_blank\" rel=\"noopener\">request a quote<\/a>.<\/span><\/p>\n<h3>What o-ring materials are approved for direct food contact applications?<\/h3>\n<p><span style=\"font-weight: 400;\">FDA doesn&#8217;t approve individual seals. Instead, compounds comply with FDA 21 CFR 177.2600. Compliant silicone options include <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a>, clear <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1020\" target=\"_blank\" rel=\"noopener\">S1020<\/a>, and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1189\" target=\"_blank\" rel=\"noopener\">S1189<\/a>, which also meets 3-A and NSF 51. In addition, FDA grades of EPDM, Buna-N such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/B1002\" target=\"_blank\" rel=\"noopener\">B1002<\/a>, FKM, and FFKM such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/Z1416\" target=\"_blank\" rel=\"noopener\">Markez\u00ae Z1416<\/a> are available. See Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/fda-o-rings-food-grade.htm\" target=\"_blank\" rel=\"noopener\">FDA food-grade O-rings<\/a>.<\/span><\/p>\n<h3>Who can supply 3A Sanitary O-rings?<\/h3>\n<p><span style=\"font-weight: 400;\">Marco Sealing Solutions supplies <a href=\"https:\/\/www.marcorubber.com\/3a-o-rings-dairy.htm\" target=\"_blank\" rel=\"noopener\">3-A sanitary O-rings<\/a> for dairy and food processing. In silicone, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1189\" target=\"_blank\" rel=\"noopener\">S1189<\/a> complies with FDA, 3-A, and NSF 51. For steam and CIP service, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/E1080\" target=\"_blank\" rel=\"noopener\">E1080<\/a> EPDM is FDA, 3-A, and USP Class VI. PFA-encapsulated <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/T1022\" target=\"_blank\" rel=\"noopener\">T1022<\/a> also meets 3-A.<\/span><\/p>\n<h3>What are the temperature limits of common o-ring materials: NBR, FKM, EPDM, Silicone, FFKM?<\/h3>\n<p><span style=\"font-weight: 400;\">Standard NBR (Buna) runs about -30 \u00b0F to +250 \u00b0F, with specialty grades reaching -65 \u00b0F to +275 \u00b0F. EPDM runs about -65 \u00b0F to +300 \u00b0F, and FKM about -15 \u00b0F to +437 \u00b0F. Silicone covers about -65 \u00b0F to +400 \u00b0F, with specialty grades from -103 \u00b0F to +500 \u00b0F. Finally, FFKM reaches +550 \u00b0F, with specialty grades to +650 \u00b0F. These ranges are approximate and apply to dry air service only.<\/span><\/p>\n<h3>What temperature range can silicone O-rings handle?<\/h3>\n<p><span style=\"font-weight: 400;\">Standard silicone O-rings typically operate from about -65 \u00b0F to +400 \u00b0F, depending on the compound. For example, <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a> is rated from -75 \u00b0F to +400 \u00b0F. Specialty grades extend the range, such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1015\" target=\"_blank\" rel=\"noopener\">S1015<\/a> to +500 \u00b0F and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1043\" target=\"_blank\" rel=\"noopener\">S1043<\/a> to -103 \u00b0F.<\/span><\/p>\n<h3>Are silicone O-rings FDA approved?<\/h3>\n<p><span style=\"font-weight: 400;\">FDA doesn&#8217;t approve individual O-rings. However, many silicone compounds comply with FDA 21 CFR 177.2600 for food and beverage contact. Marco&#8217;s <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1000\" target=\"_blank\" rel=\"noopener\">S1000<\/a> and <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/S1020\" target=\"_blank\" rel=\"noopener\">S1020<\/a> are two examples. Always request a certificate of compliance.<\/span><\/p>\n<h3>Are silicone O-rings resistant to oil?<\/h3>\n<p><span style=\"font-weight: 400;\">Silicone resists animal and vegetable oils, but it has limited resistance to petroleum oils and fuels. For oil-heavy applications, <a href=\"https:\/\/www.marcorubber.com\/viton-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Viton\u00ae O-rings<\/a> or <a href=\"https:\/\/www.marcorubber.com\/buna-n-o-rings.htm\/\" target=\"_blank\" rel=\"noopener\">Buna-N O-rings<\/a> are often better choices. For fuel with cold exposure, consider fluorosilicone such as <a href=\"https:\/\/www.marcorubber.com\/store\/compound\/F1001\" target=\"_blank\" rel=\"noopener\">F1001<\/a>.<\/span><\/p>\n<h3>What industries use silicone O-rings?<\/h3>\n<p><span style=\"font-weight: 400;\">Common industries include medical devices, pharmaceutical processing, food and beverage, electronics, and outdoor equipment manufacturing. Each one uses silicone for its temperature range and clean, non-toxic profile.<\/span><\/p>\n<h3>Are silicone O-rings good for outdoor use?<\/h3>\n<p><span style=\"font-weight: 400;\">Yes. Silicone offers excellent resistance to UV exposure, ozone, oxidation, and weathering. As a result, it holds up well in long-term outdoor service.<\/span><\/p>\n<h2><strong>Need Help Choosing the Right Silicone O-Rings?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Silicone O-rings perform well where you need extreme temperature resistance, environmental durability, and long-term flexibility. They may not suit heavy fuel or abrasion exposure. Even so, they remain one of the most versatile sealing materials for food processing, medical, and outdoor applications.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Fortunately, you don&#8217;t have to sort through the options alone. <a href=\"https:\/\/www.marcorubber.com\/inquiry-quote.htm\" target=\"_blank\" rel=\"noopener\">Request a quote<\/a> or <a href=\"https:\/\/www.marcorubber.com\/inquiry-general.htm\" target=\"_blank\" rel=\"noopener\">speak with a Marco sealing specialist<\/a> about your application requirements.<\/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-905\" src=\"https:\/\/blog.marcorubber.com\/wp-content\/uploads\/2026\/04\/Request-Quote-CTA.png\" alt=\"Request a quote.\" 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><\/p>\n<p>&nbsp;<\/p>\n<p><em><span style=\"color: #999999;\">The information contained herein is, to the best of our knowledge, accurate and reliable. However, Marco Sealing Solutions makes no warranty, expressed or implied, that parts manufactured from these materials will perform satisfactorily in the customer&#8217;s application. It&#8217;s the customer&#8217;s responsibility to evaluate parts prior to use.<\/span><\/em><\/p>\n<hr \/>\n<h3>Related Reading<\/h3>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.marcorubber.com\/silicone-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Silicone O-Rings Selection Guide<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/medical-o-rings.htm\" target=\"_blank\" rel=\"noopener\">Medical &amp; Pharma Sealing Guide<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1149\" target=\"_blank\" rel=\"noopener\">Elastomer Seal Materials for Medical Device &amp; Pharmaceutical Processing<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1135\" target=\"_blank\" rel=\"noopener\">The Complete Guide to Elastomer Seal Materials<\/a><br \/>\n<a href=\"https:\/\/www.marcorubber.com\/blog\/?p=1201\" target=\"_blank\" rel=\"noopener\">Buna O-Rings (NBR): Properties, Uses, and Limitations<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Are silicone O-rings the right seal for your application? Silicone handles extreme heat and cold better than most elastomers. As a result, silicone O-rings are a common choice in medical devices, food processing equipment, electronics, and outdoor equipment. However, silicone is not a universal answer. It has clear limits with fuels, oils, abrasion, and high-pressure [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":1216,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1213","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Silicone O-Rings: Temperature Range, Uses &amp; Limitations<\/title>\n<meta name=\"description\" content=\"Learn how silicone O-rings perform: temperature range, FDA &amp; medical-grade options, chemical compatibility, limitations, and when to avoid.\" \/>\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=1213\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Silicone O-Rings: Temperature Range, Uses &amp; 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