I've used Dymax 984-LVUF and would lose some fluorescence after curing, but it was still visible. Repeated curing would further reduce the fluorescence. After adjusting to what was typical (and verifying coupons for thickness) our inspectors were okay with it. We manually applied it in a spray booth that was fully blacklight illuminated, so coverage verification was easy for the sprayer while the coating was still wet. In addition, any reworked areas/components would be brighter than the surrounding areas due to the thickness increase and shorter overall exposure to the Fusion curing lamps. Regards, Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter Swanson Sent: Wednesday, February 10, 2010 4:47 AM To: [log in to unmask] Subject: Re: [TN] Fluorescent Tracers in UV Conformal Coating I am not sure about heat sensitivity (I have never heard of this problem), but you might have to look carefully at UV cured conformal coatings if the UV (or black light) fluorescence is important to you. Fluorescent tracers work by emitting visible energy in response to UV/black light energy. The black light inspection lamps used are usually low intensity, near-visible UV, and the visible light emitted is readily seen, especially in dim ambient conditions. This is not permanent - the visible response will become less and less over time as it is exposed to light. UV cured coatings use a high intensity, broad-band UV light to cure. The strength of this may be enough to "burn out" the fluorescent tracer, or make its response to black light quite poor. This is especially true when the coating is exposed to "more than enough" curing UV light. Luckily, some UV cured coatings are much more resilient to this than others, and their fluorescent response is still very good after normal UV cures. So include this in your testing when evaluating UV coatings. Also, do not overcure if you want to keep the optimal fluorescence for inspection purposes. Regards, Peter -------------------------------------------------------- Peter Swanson [log in to unmask] INTERTRONICS http://www.intertronics.co.uk Tel: +44 1865 842842 Oxfordshire, England INTERTRONICS is dedicated to providing quality material, consumable and equipment solutions to the high technology, high performance assembly industries, incorporating outstanding levels of technical support and customer service. Read our news! http://www.intertronics.co.uk/blog/blog.htm INTERTRONICS is the trading name of Cygnet Electronics Ltd, registered in England No 1835617. Registered office: 17 Station Field Industrial Estate, KIDLINGTON, Oxfordshire, OX5 1JD, ENGLAND. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski Sent: 10 February 2010 00:42 To: [log in to unmask] Subject: [TN] Fluorescent Tracers in UV Conformal Coating I seem to recall some details regarding UV conformal coatings, that perhaps their fluorescent tracers are more heat sensitive and fluoresce less than other non-UV conformal coatings. Can anyone substantiate or provide their experience? Rich K ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------