{"id":1928,"date":"2014-10-07T21:41:59","date_gmt":"2014-10-07T21:41:59","guid":{"rendered":"https:\/\/permabond.com\/curing-uv-adhesive\/"},"modified":"2025-05-02T19:45:03","modified_gmt":"2025-05-02T19:45:03","slug":"curing-uv-adhesive","status":"publish","type":"post","link":"https:\/\/permabond.com\/fr\/curing-uv-adhesive\/","title":{"rendered":"Curing UV Adhesive"},"content":{"rendered":"\r\n<p>See the factors that affect UV curing in this <a href=\"https:\/\/permabond.com\/factors-affecting-uvcure\/\">article,<\/a> they include:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Intensity at the adhesive site<\/li>\r\n<li>Time<\/li>\r\n<li>Wavelength<\/li>\r\n<li>Adhesive formulation<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>The above factors are interdependent to some extent.\u00a0 Increasing the intensity of UV light will decrease the time needed for the adhesive to cure.\u00a0 But both ends have limits.\u00a0 Using very high intensity short wave UV light will support a tack free surface cure with most products but can reduce the depth of cure.\u00a0 Lower intensity and longer wavelength light can increase the depth of cure but may produce a tacky surface.<\/p>\r\n\r\n\r\n\r\n<p>Being in control of the cure process provides advantages such as the ability to reposition or align parts, allow the adhesive to wick or flow into areas, etc\u2026 But it also presents questions of how much intensity and what wavelength of UV light is needed for adequate adhesion.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-light-sources-for-uv-curing\">Light Sources for UV Curing<\/h2>\r\n\r\n\r\n\r\n<p>Permabond manufactures adhesives that can be cured by a variety of UV light, including both mercury arc lamps and LEDs and even the sun.<\/p>\r\n\r\n\r\n\r\n<p>Ideally, the UV light source is measured with a radiometer <a href=\"https:\/\/www.eit.com\/\">Eit<\/a> to ensure a consistent curing process. Automated dispensing equipment ensures proper amount and placement of adhesive and a conveyor at a set speed passes the assembly at the same distance from the UV light for the same amount of time. In many cases the process controls are enough to satisfy the manufacturer\u2019s quality control requirements, but some manufacturers do destructive testing as well for added assurance.<\/p>\r\n\r\n\r\n\r\n<p>Other manufacturers rely solely on UV lamp hours as an indication of when the bulb should be changed.\u00a0 This method is not as controlled as a radiometer but can work effectively when additional quality control techniques, such as destructive testing, are in place.<\/p>\r\n\r\n\r\n\r\n<p>There are even large manufacturers in sunny climates \u2013 that use old fashioned sunshine very effectively.<\/p>\r\n\r\n\r\n\r\n<p>The methods and controls for each UV curing process are as varied as each adhesive application.\u00a0 Contact either the adhesive manufacturers, UV lamp manufacturers, or radiometer manufacturer for suggested UV curing schedules for your specific application.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-how-do-i-know-if-it-is-cured\"><span style=\"text-decoration: underline;\">HOW DO I KNOW IF IT IS CURED<\/span><\/h2>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-reducing-uv-curing-time\">Reducing UV Curing Time<\/h2>\r\n\r\n\r\n\r\n<p>Try UV curing at half that time and test for adhesion. If the adhesion is still the same, half the cure time again until you see a drop in strength.\u00a0 The time prior to the drop in strength is the lower limit of your cure process range.\u00a0 I also like to test adhesion at twice the suggested time.\u00a0 If adhesion has increased, the original time was inadequate.\u00a0 When further curing does not increase strength, you have complete cure.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-achieving-complete-uv-curing\">Achieving Complete UV Curing<\/h2>\r\n\r\n\r\n\r\n<p>It is tempting to manufacturers to increase cure times or intensity just to be sure.\u00a0 If a little is good, more is better, right? In discussing and reading others discussions of bond strength, temperature resistance, and a variety of other adhesive properties on a daily basis, I see the phrases \u201censure the adhesive is fully cured\u201d or \u201cafter thoroughly curing the adhesive\u2026\u201d or \u201cupon complete cure, the adhesive\u2026\u201d.\u00a0 So it is no wonder that we have some overly zealous \u201ccurers\u201d out there!<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\" id=\"h-side-effects-of-over-uv-curing\">Side Effects of Over UV Curing<\/h2>\r\n\r\n\r\n\r\n<p><a href=\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/UV-cure.jpg\"><img decoding=\"async\" class=\"wp-image-554 alignleft\" src=\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/UV-cure-300x194.jpg\" alt=\"UV curing\" \/><\/a><\/p>\r\n<p>Clearly, it is critical to ensure complete cure, so manufacturers with less controlled processes tend to err on the side of over curing.\u00a0 Generally, extending cure time 2 to 3 times the required amount of light is not detrimental to the adhesive.\u00a0 However, take care to ensure the additional exposure to heat is not degrading components. Often, a fan is sufficient.\u00a0 UV light aging and thermal aging processes produce many of the same effects on plastics, including color changes, shape-size changes, hardness and elongation changes, and embrittlement.\u00a0\u00a0 To test for thermal or UV aging of the adhesive, consider the cured adhesive as you would a plastic.\u00a0 Extreme over curing can degrade both plastic and adhesive.<\/p>\r\n\r\n\r\n\r\n<p>For more information on UV light Adhesives click <a href=\"https:\/\/permabond.com\/products\/uv-glue-uv-adhesive\/\" target=\"_blank\" rel=\"noopener\">here<\/a>\u00a0or <a href=\"https:\/\/permabond.com\/contact-us\" target=\"_blank\" rel=\"noopener\">contact us <\/a>to help you select the right adhesive for your application.<\/p>\r\n\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>See the factors that affect UV curing in this article, they include: Intensity at the adhesive site Time Wavelength Adhesive formulation The above factors are interdependent to some extent.\u00a0 Increasing the intensity of UV light will decrease the time needed for the adhesive to cure.\u00a0 But both ends have limits.\u00a0 Using very high intensity short [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1929,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[607,612],"tags":[165,66,85,322,323,324,87],"class_list":["post-1928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adhesive-selection-and-use","category-tips","tag-light-cure-adhesive","tag-uv","tag-uv-adhesives","tag-uv-cure","tag-uv-curing","tag-uv-glue","tag-uv-lamp"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - 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