{"id":2049,"date":"2015-11-25T00:42:38","date_gmt":"2015-11-25T00:42:38","guid":{"rendered":"https:\/\/permabond.com\/heat-cure-epoxy-making-adhesive-properly-cured\/"},"modified":"2025-02-11T19:12:59","modified_gmt":"2025-02-11T19:12:59","slug":"heat-cure-epoxy-making-adhesive-properly-cured","status":"publish","type":"post","link":"https:\/\/permabond.com\/de\/heat-cure-epoxy-making-adhesive-properly-cured\/","title":{"rendered":"Heat cure epoxy \u2013 making sure the adhesive is properly cured"},"content":{"rendered":"\r\n<h2 class=\"wp-block-heading\" id=\"h-what-is-epoxy-adhesive\">What is epoxy adhesive?<\/h2>\r\n\r\n\r\n\r\n<p><a title=\"Single part epoxies\" href=\"https:\/\/permabond.com\/products\/epoxies-single-part\/\" target=\"_blank\" rel=\"noopener\">Single part epoxies<\/a> contain both resin and hardener in one mixture. Unlike <a title=\"two part epoxies\" href=\"https:\/\/permabond.com\/products\/epoxies-two-part-epoxy-adhesives\/\" target=\"_blank\" rel=\"noopener\">2 part epoxies<\/a> where each part is separate and mixed before use). The curing mechanism of heat cure epoxy is activated when exposed to high temperature and cures the adhesive.\u00a0 Continued exposure to heat enables cross linking of polymers as they form and ensures a high strength, rigid cured solid material.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-curing-temperatures-and-cure-schedules\">Curing temperatures and cure schedules<\/h2>\r\n\r\n\r\n\r\n<p>Most Permabond <a title=\"single part epoxies\" href=\"https:\/\/permabond.com\/products\/epoxies-single-part\/\" target=\"_blank\" rel=\"noopener\">single part epoxies<\/a> cure between 100 and 150\u00b0C although there are a few exceptions.\u00a0 Several heat cure epoxy adhesives cure at temperatures below 100\u00b0C. These are for plastic bonding or for bonding sensitive electronics or sensors where higher temperatures could distort or damage parts. Some heat cure epoxy adhesives, when used in thin film, (for example, an epoxy sealant) can be cured at higher temperatures.\u00a0 But for depth curing of bulk material there can be an unwanted exothermic reaction as the cure process itself produces heat.<\/p>\r\n\r\n\r\n\r\n<p>It is important to follow the cure schedule as specified on the epoxy adhesive manufacturers \u00a0technical datasheet. Deviation from this may result in an under cured or charred adhesive.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-troubleshooting-my-adhesive-is-still-soft-not-fully-cured-or-the-strength-is-limited\">Troubleshooting \u2013 my adhesive is still soft \/ not fully cured or the strength is limited<\/h2>\r\n\r\n\r\n\r\n<p>Although you may have set your oven at 150\u00b0C (for example) and the assembly has been in there for the recommended time, there may be some other factors which may have prevented a complete cure:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>How big the assembly is \u2013 how long is it taking to warm up to 150\u00b0C?<\/li>\r\n<li>How loaded is the oven? If there are a lot of parts in the oven it could take longer<\/li>\r\n<li>Is the oven the same temperature throughout? Many ovens have hotspots or cooler zones<\/li>\r\n<li>Is the thermostat in the oven reliable?<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-how-do-i-check-the-oven-is-working-properly\">How do I check the oven is working properly?<\/h2>\r\n\r\n\r\n\r\n<p>You could use a temperature logger with a thermocouple attached (with a long piece of wire leading inside the oven and placed on the part). It will record the entire oven cycle on a graph.\u00a0 If you don\u2019t have access to a temperature logger, you could use an electronic thermometer. Again with thermocouple attachment so you can monitor what is going on inside the oven without opening the door.<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"alignleft\"><a href=\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/thermometer-with-thermocouple.jpg\"><img decoding=\"async\" class=\"wp-image-870\" src=\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/thermometer-with-thermocouple-300x300.jpg\" alt=\"thermometer with thermocouple\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-how-can-i-tell-if-the-epoxy-bond-is-fully-cured\">How can I tell if the epoxy bond \u00a0is fully cured?<\/h2>\r\n\r\n\r\n\r\n<p>This can be difficult as the adhesive may appear solid but it may not have \u201ccross-linked\u201d fully. Testing the Shore D hardness is probably the easiest and cheapest test without having to purchase a tensometer for measuring shear strength!<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"alignleft\"><a href=\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/Shore-D-hardness2.jpg\"><img decoding=\"async\" class=\"wp-image-871\" src=\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/Shore-D-hardness2-300x300.jpg\" alt=\"Shore D hardness2\" \/><\/a><\/figure>\r\n<\/div>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-are-there-any-other-methods-of-curing-single-part-epoxy-without-using-an-oven\">Are there any other methods of curing single part epoxy without using an oven?<\/h2>\r\n\r\n\r\n\r\n<p>Yes, some users successfully cure single part epoxy adhesive using:<\/p>\r\n<ul>\r\n<li>Heat guns<\/li>\r\n<li>Infra-red lamps<\/li>\r\n<li>Custom made heated clamps<\/li>\r\n<li>Induction coil<\/li>\r\n<\/ul>\r\n<p>This can be hit and miss &#8211; some of these methods make it very difficult to ensure the parts are exposed to the correct temperature for the recommended time. In this case all you can really do is check the hardness of the cured product.\u00a0 Induction methods of curing are only suitable for certain substrate materials which are conductive.<\/p>\r\n\r\n\r\n\r\n<p>See Permabond <a title=\"single part epoxy\" href=\"https:\/\/permabond.com\/products\/epoxies-single-part\/\" target=\"_blank\" rel=\"noopener\">single part epoxy<\/a> adhesive cure schedules <a title=\"cure schedule\" href=\"https:\/\/permabond.com\/products\/epoxies-single-part\/\" target=\"_blank\" rel=\"noopener\">here<\/a>.\u00a0 If you have questions about your heat cure process click <a title=\"Contact\" href=\"https:\/\/permabond.com\/contact-us\/\" target=\"_blank\" rel=\"noopener\">here<\/a>.<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>What is epoxy adhesive? Single part epoxies contain both resin and hardener in one mixture. Unlike 2 part epoxies where each part is separate and mixed before use). The curing mechanism of heat cure epoxy is activated when exposed to high temperature and cures the adhesive.\u00a0 Continued exposure to heat enables cross linking of polymers [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2059,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[607,612],"tags":[75,134,137,106],"class_list":["post-2049","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adhesive-selection-and-use","category-tips","tag-epoxy","tag-heat-cure-epoxy","tag-single-part-epoxy","tag-two-part-epoxy"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Heat cure epoxy \u2013 making sure the adhesive is properly cured<\/title>\n<meta name=\"description\" content=\"Heat cure epoxies or single part epoxies contain both resin and hardener in one mixture Factors affecting cure are discussed.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/permabond.com\/de\/heat-cure-epoxy-making-adhesive-properly-cured\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heat cure epoxy \u2013 making sure the adhesive is properly cured\" \/>\n<meta property=\"og:description\" content=\"Heat cure epoxies or single part epoxies contain both resin and hardener in one mixture Factors affecting cure are discussed.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/permabond.com\/de\/heat-cure-epoxy-making-adhesive-properly-cured\/\" \/>\n<meta property=\"og:site_name\" content=\"Permabond\" \/>\n<meta property=\"article:publisher\" 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Gibbons","image":{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/secure.gravatar.com\/avatar\/ef30a45eda5c8ff1e3f4c6288df66f8a58ab5b054fecced621a7c58e0e6fe4ba?s=96&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/ef30a45eda5c8ff1e3f4c6288df66f8a58ab5b054fecced621a7c58e0e6fe4ba?s=96&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/ef30a45eda5c8ff1e3f4c6288df66f8a58ab5b054fecced621a7c58e0e6fe4ba?s=96&r=g","caption":"Laurie Gibbons"},"description":"Laurie has worked in the adhesive industry for over 30 years. 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