With the core advantages of high\/low temperature resistance, weathering and aging resistance, and electrical insulation, silicone rubber is widely used in new energy power battery sealing rings, electronic thermal conductive pads, power insulation components, smart wearable watch bands, and other fields. However, pure silicone rubber itself has a limiting oxygen index of only about 21%; in the conventional UL94 vertical burning test it can only reach HB level, and it can continue burning when exposed to fire with melting dripping, so it cannot meet the fire safety requirements of high-end fields. As safety standards in the new energy and electronics\/power industries continue to upgrade, upgrading silicone rubber products to UL94 V-0 has become a rigid admission requirement for many downstream customers. Unlike ordinary engineering plastics that rely on matrix charring for flame retardancy, silicone rubber mainly produces silica at high temperatures and cannot easily form a dense protective layer on its own; therefore, plastic flame-retardant formulations cannot be directly applied, and a dedicated halogen-free flame-retardant system must be designed according to the characteristics of the silicone substrate.<\/p>\n
At present, to achieve V0 flame retardancy in silicone, the industry mainstream adopts a compound approach of \u201cinorganic filler as the base + platinum-based synergist\u201d. A single aluminum hydroxide (ATH) system has low cost and good smoke suppression, but it requires an extremely high filling amount to meet the standard, which seriously loses the resilience and tensile properties of silicone, making products hard and prone to cracking. A more balanced solution is ATH combined with a platinum-based synergist, which is also a flame-retardant technical path unique to silicone rubber: a trace amount of platinum compound can catalyze rapid crosslinking of silicone rubber molecules in the early stage of combustion, forming a dense SiO\u2082-C composite char layer; the synergy of the two can greatly reduce the total filling amount, achieving V-0 while preserving the original elasticity and softness of silicone to the greatest extent. For thin-walled products with higher requirements, an appropriate amount of phosphorus-nitrogen flame-retardant components can also be compounded to supplement gas-phase flame retardancy and char formation promotion, further improving flame-retardant efficiency. Two key details in formulation design cannot be ignored: first, addition-curing liquid silicone rubber should avoid flame retardants containing free amino groups to prevent platinum catalyst poisoning that causes delayed vulcanization or incomplete curing; second, the thinner the product, the higher the efficiency requirement for the flame-retardant system\u2014thin-walled parts below 1 mm cannot directly use the addition ratio for thick products and require targeted optimization of filler particle size and compound ratio; at the same time, fillers treated with silane surface treatment can significantly improve compatibility with the silicone matrix and reduce exudation and blooming.<\/p>\n
Dongguan Hongtaiji Flame Retardant Materials has launched a dedicated halogen-free flame retardant series for silicone rubber systems, among which FR-562A is suitable for thin-walled silicone scenarios, with good compatibility and strong anti-exudation ability; while reaching UL94 V-0, it can retain the original resilience and surface smoothness of silicone, and the entire product series complies with RoHS and REACH environmental standards. Overall, the core of achieving V0 flame retardancy in silicone rubber products is to balance flame-retardant rating and material physical properties through multi-component compounding synergy, and to make precise selections based on the curing system and product thickness, so as to stably meet the standard without affecting the original performance of the product.<\/p>","protected":false},"excerpt":{"rendered":"
\u7845\u6a61\u80f6\u51ed\u501f\u8010\u9ad8\u4f4e\u6e29\u3001\u8010\u5019\u8001\u5316\u3001\u7535\u6c14\u7edd\u7f18\u7684\u6838\u5fc3\u4f18\u52bf\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u65b0\u80fd\u6e90\u52a8\u529b\u7535\u6c60\u5bc6\u5c01\u5708\u3001\u7535\u5b50\u5bfc\u70ed\u57ab\u7247\u3001\u7535\u529b\u7edd\u7f18\u4ef6\u3001\u667a […]<\/p>\n","protected":false},"author":1,"featured_media":1180,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"class_list":["post-1704","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industrial-news"],"_links":{"self":[{"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/posts\/1704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/comments?post=1704"}],"version-history":[{"count":1,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/posts\/1704\/revisions"}],"predecessor-version":[{"id":1705,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/posts\/1704\/revisions\/1705"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/media\/1180"}],"wp:attachment":[{"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/media?parent=1704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/categories?post=1704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dghtj.com\/en\/wp-json\/wp\/v2\/tags?post=1704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}