{"id":1431,"date":"2016-09-07T19:22:12","date_gmt":"2016-09-07T19:22:12","guid":{"rendered":"http:\/\/monroeengineering.com\/blog\/?p=1431"},"modified":"2024-12-04T15:49:58","modified_gmt":"2024-12-04T15:49:58","slug":"lets-talk-eps","status":"publish","type":"post","link":"https:\/\/monroeengineering.com\/blog\/lets-talk-eps\/","title":{"rendered":"Let&#8217;s Talk EP&#8217;s"},"content":{"rendered":"<p><span style=\"color: #333333;\">\u00a0<img loading=\"lazy\" decoding=\"async\" class=\" size-medium wp-image-1438 alignleft\" src=\"http:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2016\/09\/Monroe-Seals-EPM-300x172.jpg\" alt=\"monroe-seals-epm\" width=\"300\" height=\"172\" srcset=\"https:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2016\/09\/Monroe-Seals-EPM-300x172.jpg 300w, https:\/\/monroeengineering.com\/blog\/wp-content\/uploads\/2016\/09\/Monroe-Seals-EPM.jpg 468w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>We are often asked about\u00a0the differences between the various ethylene-propylene rubber compounds. There are a slew of acronyms used for EP and there are also different cure systems. What are the differences? Well, it is important to know what the differences are because what may work well in one application, may not work well in another.<\/span><\/p>\n<p><span style=\"color: #333333;\">Let\u2019s start by giving a general overview of ethylene-propylene rubber. EP has excellent ozone, UV, and weather resistance. It also has good mechanical properties. In regards to fluids, EP\u2019s typically have resistance to dilute acids, alkalis, ketones, alcohol, automotive brake fluids, phosphate ester-based hydraulic fluids and water. On the flip side, EP\u2019s will swell considerably in petroleum based fluids.<\/span><\/p>\n<p><span style=\"color: #333333;\">Ethylene-propylene elastomers can be compounded to operate in continuous service temperatures of<\/span><br \/>\n<span style=\"color: #333333;\"> -65\u00b0F to +300\u00b0F. In steam service the EP can operate at up to 400\u00b0F.<\/span><\/p>\n<p><span style=\"color: #333333;\">An EP molecule is made up of smaller molecules call monomers. The monomers are linked together to form a chain. The types of monomers used, dictate the type of EP you have.<\/span><\/p>\n<p><span style=\"color: #333333;\">Let\u2019s define the most common acronyms you see for EP: EPM, EPDM EPT, and EPR.<\/span><\/p>\n<p><span style=\"color: #333333;\"><strong>EPM<\/strong> is what you call the ethylene-propylene copolymer. The copolymer is just what it sounds like; it is made up of two monomers, ethylene and propylene.<\/span><\/p>\n<p><span style=\"color: #333333;\"><strong>EPDM<\/strong> is the acronym for<\/span> <span style=\"color: #333333;\"><strong>e<\/strong>thylene-<strong>p<\/strong>ropylene-<strong>d<\/strong>iene<\/span> <span style=\"color: #333333;\"><strong>m<\/strong>onomer. This type of EP is made up of 3 monomers. When you have 3 monomers it is called a terpolymer, thus<\/span> <span style=\"color: #333333;\"><strong>EPT<\/strong><\/span> <span style=\"color: #333333;\">stands for <strong>e<\/strong>thylene-<strong>p<\/strong>ropylene-<strong>t<\/strong>erpolymer and is the same thing as EPDM.<\/span><\/p>\n<p><span style=\"color: #333333;\"><strong>EPR<\/strong> simply stands for ethylene-propylene rubber and can be used to describe the entire family of ethylene-propylene elastomers.<\/span><\/p>\n<p><span style=\"color: #333333;\">When EP was first invented the only available cure system utilized peroxide. Peroxide cured materials are difficult to process because they stick to the mold, they are hard to deflash, and are susceptible to scorching. Posed with this problem, rubber chemists added the 3rd monomer, the diene monomer, to the EP molecule. This 3rd monomer allowed for a cure site for the sulfur cure system.<\/span><\/p>\n<p><span style=\"color: #333333;\">Sulfur cured EPDM elastomers are easier to process and generally cost less than the peroxide cured materials. You would generally use sulfur cured EP products for environmental seals where service temperatures do not exceed 212\u00b0F. This may be window glazing, potable water applications, or where resistance to weather is important.<\/span><\/p>\n<p><span style=\"color: #333333;\">You would use the peroxide cured EP\u2019s for more demanding applications where temps may reach 300\u00b0F. The peroxide cured EP\u2019s offer better heat resistance, and compression set resistance. Typical applications are automotive brake systems or steam applications.<\/span><\/p>\n<p><span style=\"color: #333333;\">If you have any questions,<\/span><strong><span style=\"color: #8b0f04;\"> <a style=\"color: #8b0f04;\" href=\"http:\/\/www.monroeseals.com\/contact.php\" target=\"_blank\" rel=\"noopener\">contact us<\/a><\/span><\/strong><span style=\"color: #333333;\"> or<\/span> <strong><span style=\"color: #8b0f04;\"><a style=\"color: #8b0f04;\" href=\"http:\/\/www.monroeseals.com\/\" target=\"_blank\" rel=\"noopener\">visit our website<\/a><\/span><\/strong>.<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #333333;\">We are Monroe! How can we help?<\/span><\/h2>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0We are often asked about\u00a0the differences between the various ethylene-propylene rubber compounds. There are a slew of acronyms used for EP and there are also different cure systems. What are the differences? Well, it is important to know what the &hellip; <a class=\"continue-reading\" href=\"https:\/\/monroeengineering.com\/blog\/lets-talk-eps\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":19085,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[84],"tags":[],"class_list":["post-1431","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seals"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Let&#039;s Talk EP&#039;s | OneMonroe<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/monroeengineering.com\/blog\/lets-talk-eps\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Let&#039;s Talk EP&#039;s | OneMonroe\" \/>\n<meta property=\"og:description\" content=\"\u00a0We are often asked about\u00a0the differences between the various ethylene-propylene rubber compounds. 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