{"id":7980,"date":"2025-12-25T09:00:00","date_gmt":"2025-12-25T09:00:00","guid":{"rendered":"https:\/\/uplastech.com\/platinum-cure-vs-peroxide-cure\/"},"modified":"2025-12-25T09:00:00","modified_gmt":"2025-12-25T09:00:00","slug":"platinum-cure-vs-peroxide-cure","status":"publish","type":"post","link":"https:\/\/uplastech.com\/ja\/platinum-cure-vs-peroxide-cure\/","title":{"rendered":"Platinum Versus Peroxide Cure: Speed, Purity and Inhibition"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure img{width:100%;height:auto;display:block;border-radius:10px}\n.upl-blog figcaption{font-size:13px;color:#6b7280;margin-top:10px;line-height:1.5}\n.upl-blog .toc{background:none;border:0;border-radius:0;padding:0;margin:0 0 34px}\n.upl-blog .toc .lwptoc{margin:0}\n.upl-blog .toc h4{margin:0 0 10px;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#0d5563}\n.upl-blog .toc ol{margin:0;padding-left:18px;font-size:14.5px}\n.upl-blog .toc li{margin-bottom:6px}\n.upl-blog table{width:100%;border-collapse:collapse;font-size:14.5px;margin:0 0 10px}\n.upl-blog th{background:#0d3b47;color:#fff;text-align:left;padding:11px 13px;font-weight:600;font-size:13.5px;border:0}\n.upl-blog td{padding:11px 13px;border:0;border-bottom:1px solid #e8ebed;vertical-align:top}\n.upl-blog tbody tr:nth-child(even){background:#fafbfc}\n.upl-blog .tablecap{font-size:12.5px;color:#6b7280;margin:0 0 30px}\n.upl-blog .myth{background:#fff8ef;border:1px solid #f6ddbd;border-radius:8px;padding:16px 20px;margin:0 0 26px;font-size:15.5px}\n.upl-blog .myth b{color:#a85c10}\n.upl-blog .callout{background:#f2f8f9;border-radius:8px;padding:18px 22px;margin:0 0 26px;font-size:15.5px;border-left:3px solid #14707f}\n.upl-blog .faq h3{border-top:1px solid #eceff1;padding-top:22px;margin-top:0;font-size:18px}\n.upl-blog .faq h3:first-of-type{border-top:0;padding-top:0}\n.upl-blog .cta{background:linear-gradient(135deg,#0b2b33,#0d5563);color:#fff;border-radius:12px;padding:34px;margin:48px 0 30px}\n.upl-blog .cta h2,.upl-blog .cta .cta-h{color:#fff;margin:0 0 10px;font-size:24px;font-weight:700;line-height:1.3}\n.upl-blog .cta p{color:#c9dee3;margin:0 0 20px;font-size:16px}\n.upl-blog .btn{display:inline-block;background:#e07a1f;color:#fff;text-decoration:none;font-weight:700;padding:13px 26px;border-radius:8px;font-size:15.5px}\n.upl-blog .rel{border-top:1px solid #e8ebed;margin-top:40px;padding-top:26px}\n.upl-blog .rel h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#6b7280;margin:0 0 14px}\n.upl-blog .rel ul{list-style:none;padding:0;margin:0}\n.upl-blog .rel li{padding:11px 0;border-bottom:1px dashed #e8ebed}\n.upl-blog .rel a{text-decoration:none;font-weight:600;font-size:15.5px}\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae\u3002\n   \u6ce8\u610f\uff1aClick to Chat \u7684\u70b9\u51fb\u903b\u8f91\u662f\u300c\u95ee\u5019\u5361\u5143\u7d20\u5b58\u5728\u5c31\u4e0d\u8df3\u8f6c\u300d\uff0c\u53ea\u9760 CSS \u9690\u85cf\u4f1a\u8ba9\u6c14\u6ce1\u53d8\u6210\u6b7b\u94fe\u63a5\u3002\n   Code Snippets #9\u300cUPL single post: WhatsApp bubble jumps straight to chat\u300d\u8d1f\u8d23\u628a\u8be5\u8282\u70b9\u4ece DOM \u79fb\u9664\uff0c\n   \u4e0b\u9762\u8fd9\u6761 CSS \u53ea\u662f\u79fb\u9664\u524d\u7684\u89c6\u89c9\u515c\u5e95\u3002\u5220 #9 \u524d\u5fc5\u987b\u5148\u5220\u8fd9\u6761\u89c4\u5219\u3002 *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/10\/platinum-cure-vs-peroxide-cure.jpg\" alt=\"Cure time against temperature for platinum and peroxide systems, and compression set against service temperature\" width=\"1536\" height=\"909\"><figcaption>Platinum reaches t90 in 60 seconds at 120 C against 90 for peroxide, and holds a 12 percent set at 70 C against 18.<\/figcaption><\/figure>\n<div class=\"toc\"><\/div>\n<h2 id=\"two\">Two chemistries, two sets of rules<\/h2>\n<p>Silicone rubber cures by one of two reactions. Peroxide cure uses an organic peroxide that decomposes under heat and abstracts hydrogen from the polymer, creating radicals that combine to form crosslinks. Platinum cure uses a hydride-functional crosslinker and a vinyl-functional polymer, joined by a platinum catalyst in an addition reaction.<\/p>\n<p>The difference is not a matter of degree. Peroxide cure produces volatile by-products, needs no catalyst metal, and works with almost any silicone. Platinum cure produces no by-products, needs a very small amount of a very expensive metal, and is poisoned by a long list of materials.<\/p>\n<p>Most of the properties people associate with silicone, the low compression set, the absence of taste and odour, the optical clarity, come from the platinum system. Most of the robustness in a dirty factory comes from the peroxide system. Choosing between them is choosing which problem to have.<\/p>\n<h2 id=\"speed\">Platinum is faster and sets better<\/h2>\n<p>At 120 C a platinum-cured compound reaches 90 percent of its cure in 60 seconds; a peroxide compound takes 90. At 140 C the figures are 35 and 55, at 160 C 20 and 32, and at 180 C 12 and 20. Platinum is about 35 to 40 percent faster across the range.<\/p>\n<p>The gap in compression set is larger and it widens with temperature. At 70 C service the platinum compound sets 12 percent against 18 for peroxide, at 100 C 16 against 26, at 130 C 22 against 36 and at 160 C 30 against 48.<\/p>\n<p>The reason is the by-product. A peroxide cure leaves fragments of the peroxide and of the abstracted hydrogen in the network, and those fragments act as a plasticiser and as sites for further rearrangement. The network is less perfect, and it relaxes more under load. Platinum leaves nothing behind, so the network is cleaner and holds its shape.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\n<th>Platinum<\/th>\n<th>Peroxide<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cure time at 120 C<\/td>\n<td>60 s<\/td>\n<td>90 s<\/td>\n<\/tr>\n<tr>\n<td>Cure time at 160 C<\/td>\n<td>20 s<\/td>\n<td>32 s<\/td>\n<\/tr>\n<tr>\n<td>Compression set at 70 C<\/td>\n<td>12 percent<\/td>\n<td>18 percent<\/td>\n<\/tr>\n<tr>\n<td>Compression set at 160 C<\/td>\n<td>30 percent<\/td>\n<td>48 percent<\/td>\n<\/tr>\n<tr>\n<td>By-products<\/td>\n<td>None<\/td>\n<td>Volatile fragments<\/td>\n<\/tr>\n<tr>\n<td>Catalyst poisons<\/td>\n<td>Many<\/td>\n<td>Almost none<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 \u2014 What the two systems deliver, side by side.<\/p>\n<h2 id=\"poison\">Peroxide tolerates dirty rubber<\/h2>\n<p>The platinum catalyst is inhibited by sulphur, amines, tin, phosphorus and several metals, at concentrations measured in parts per million. A moulding shop that also runs sulphur-cured rubber will poison a platinum compound from the air, the mould, the gloves or the mixer, and the symptom is a batch that will not cure at all.<\/p>\n<p>The inhibition is not always total. A small amount of a poison slows the cure, so the part comes out with a tacky surface and a soft interior, and the operator responds by raising the temperature, which cures the surface harder and leaves the interior worse. That is the classic failure mode of a platinum compound in a contaminated shop.<\/p>\n<p>Peroxide cure has almost no such sensitivity. It works in a shop that also runs sulphur rubber, it works with a filler that contains trace metals, and it works with a mould that was used for something else. That robustness is why it survives in general-purpose rubber moulding even though its properties are worse.<\/p>\n<div class=\"callout\">If a platinum compound stops curing and the cure curve looks flat, suspect a poison before you suspect the catalyst level. Test by curing a sample in a clean laboratory press.<\/div>\n<h2 id=\"inhibit\">Inhibition and pot life<\/h2>\n<p>A platinum compound needs an inhibitor to be workable at all. Without one, the addition reaction would begin as soon as the catalyst met the crosslinker, and the compound would cure in the mixer. The inhibitor holds the reaction back at room temperature and is consumed or driven off at cure temperature.<\/p>\n<p>That gives a pot life measured in hours or days at room temperature, and it also makes the cure sensitive to anything that affects the inhibitor. A compound stored warm ages faster; a compound mixed with a tool that carries a trace of a poison cures unevenly; a compound that is milled too hot loses inhibitor before it is used.<\/p>\n<p>Peroxide compounds have a different time problem. The peroxide itself decomposes slowly at room temperature, so a compounded batch has a shelf life of weeks rather than months, and it is stored cool. The advantage is that the cure does not depend on an inhibitor balance, so it is far less sensitive to how the batch was handled.<\/p>\n<h2 id=\"taste\">Set, volatiles, taste and clarity<\/h2>\n<p>Peroxide cure leaves volatile fragments that come out over time. In a sealed application they fog a lens, in a food application they taint the product, and in a medical application they are an extractable that has to be declared. A post-cure oven drives most of them off, and it is an extra step that has to be specified.<\/p>\n<p>Platinum cure has no by-products, so it is the default for anything that touches food, skin, drinking water or a pharmaceutical. It is also the default for optical parts, because a peroxide cure scatters light and a platinum cure does not.<\/p>\n<p>The trade is cost. The platinum catalyst is expensive and the compound price reflects it, sometimes by a factor of two. On a part where the properties do not matter, that factor decides the choice; on a part where they do, it does not.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u7533\u3057\u8fbc\u307f<\/th>\n<th>System<\/th>\n<th>Reason<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Baby bottle teats<\/td>\n<td>Platinum<\/td>\n<td>No by-products, no taste<\/td>\n<\/tr>\n<tr>\n<td>\u533b\u7642\u7528\u30c1\u30e5\u30fc\u30d6<\/td>\n<td>Platinum<\/td>\n<td>Extractables and clarity<\/td>\n<\/tr>\n<tr>\n<td>Optical lenses<\/td>\n<td>Platinum<\/td>\n<td>No light scattering<\/td>\n<\/tr>\n<tr>\n<td>General seals<\/td>\n<td>Either<\/td>\n<td>Cost decides<\/td>\n<\/tr>\n<tr>\n<td>Sulphur-contaminated shop<\/td>\n<td>Peroxide<\/td>\n<td>Platinum would be poisoned<\/td>\n<\/tr>\n<tr>\n<td>High-temperature gaskets<\/td>\n<td>Platinum<\/td>\n<td>Lower compression set<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 \u2014 Which system is used where, and why.<\/p>\n<h2 id=\"choose\">How to choose<\/h2>\n<p>The decision comes down to four questions, and the first two usually settle it.<\/p>\n<ol>\n<li>Does the part touch food, skin, water or a patient? If yes, platinum.<\/li>\n<li>Does the part have to be clear, or free of odour? If yes, platinum.<\/li>\n<li>Is the shop shared with sulphur-cured rubber, or is the filler of unknown quality? If yes, peroxide.<\/li>\n<li>Is the part cost-dominated and the specification loose? Peroxide is cheaper, and it will do the job.<\/li>\n<\/ol>\n<p>The one thing not to do is to choose platinum for a shop that cannot keep it clean. A compound that cures reliably in a laboratory and intermittently on the floor is worse than a peroxide compound that cures every time, whatever the data sheet says.<\/p>\n<div class=\"faq\">\n<h3>Which cures faster, platinum or peroxide?<\/h3>\n<p>Platinum, by about 35 to 40 percent. It reaches t90 in 60 seconds at 120 C where peroxide takes 90, and in 12 seconds at 180 C where peroxide takes 20.<\/p>\n<h3>Why does platinum give a lower compression set?<\/h3>\n<p>Because it leaves no by-products. Peroxide fragments remain in the network and act as a plasticiser, so it relaxes more under load at temperature.<\/p>\n<h3>What poisons a platinum cure?<\/h3>\n<p>Sulphur, amines, tin, phosphorus and several metals, at parts per million. A shop that also runs sulphur-cured rubber can poison a platinum compound from the air or the mould.<\/p>\n<h3>Can peroxide-cured silicone touch food?<\/h3>\n<p>Only with a specified post-cure to drive off the volatile fragments, and even then it is a compromise. Platinum is the standard for food contact.<\/p>\n<h3>Why is platinum-cured silicone more expensive?<\/h3>\n<p>The catalyst is a platinum complex used at low concentration but at a high metal price. The compound can cost twice as much as the peroxide equivalent.<\/p>\n<h3>My platinum compound will not cure. What should I check?<\/h3>\n<p>Contamination first: mould, gloves, mixer, filler, and any sulphur rubber in the building. Cure a sample in a clean laboratory press to separate a poison from a formulation problem.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Choosing a cure system for a silicone part?<\/p>\n<p>Tell us what the part touches and what temperature it sees. We will recommend platinum or peroxide and say what the choice does to the price and the lead time.<\/p>\n<p><a class=\"btn\" href=\"https:\/\/uplastech.com\/ja\/silicone-rubber-products\/\">Ask about silicone cure systems<\/a>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/ja\/silicone-compound-formulation\/\">Silicone Compound Formulation: Filler, Catalyst and Inhibitor<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ja\/hcr-solid-silicone-rubber\/\">HCR Solid Silicone Rubber: Compound, Milling and Moulding<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ja\/medical-grade-silicone\/\">Medical Grade Silicone: What the Certification Actually Covers<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ja\/food-grade-silicone\/\">Food Grade Silicone: Compliance, Cure and Extractables<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ja\/silicone-transfer-molding\/\">Silicone Transfer Molding: Pot Life, Runner and Scrap<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Platinum cures in 60 seconds at 120 C where peroxide needs 90, and its compression set is 12 percent at 70 C against 18. What it will not tolerate is sulphur, amines or tin, and that is the whole trade.<\/p>","protected":false},"author":1,"featured_media":7979,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Platinum vs Peroxide Cure: Which Silicone","_seopress_titles_desc":"Platinum addition cure against peroxide cure in silicone: cure time and compression set compared, inhibition and catalyst poisons, by-products, taste and odour,","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"39","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[39],"tags":[],"class_list":["post-7980","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-silicone-rubber-products"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/posts\/7980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/comments?post=7980"}],"version-history":[{"count":0,"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/posts\/7980\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/media\/7979"}],"wp:attachment":[{"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/media?parent=7980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/categories?post=7980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uplastech.com\/ja\/wp-json\/wp\/v2\/tags?post=7980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}