Electronics Forum | Thu Jun 27 06:22:30 EDT 2019 | robl
OSP is water based so guessing more involved is evaporation and dilution from humidity. From memory this may have been something to do with loosely bound electrons to the nitrogen atoms that could be easily freed up compromising the coating, but I
Electronics Forum | Wed Jul 29 21:16:17 EDT 2020 | SMTA-64387706
Hi, I have a PCB that works fine when tested before conformal coating with HumiSeal 1B73. It seems like the CC is causing electrical issues. We brush it on, so it is a bit thick. After curing we are getting QFNs that do not seem to connect well and a
Electronics Forum | Wed Feb 16 08:03:04 EST 2000 | Dave F
Steve: Fused HASL is a routine HASL coating that has been reflowed, giving it a flatter, less domed surface. Awww ol' Moonie always liked to set things like "fused HASL" straight, at least from the perspective of ... Ta Dave F
Electronics Forum | Thu Jan 04 20:16:02 EST 2001 | Mike Konrad
Hi Cory, As a manufacturer of aqueous cleaning systems, my advise is somewhat biased, however I believe it to be accurate. We have hundreds of customers who have implemented no-clean programs. The programs have been successful when measuring the r
Electronics Forum | Wed Dec 06 19:55:13 EST 2000 | Dave F
it's a "clear" material printed on top of each via [top & bottom side]. Apparantly, there is some color to it so it changes ... * Mask blue from green * Gray stuff in the vias to gray stuff colored [although it may be some other color and the clea
Electronics Forum | Mon Apr 17 19:44:20 EDT 2000 | Dave F
Ashok: Well, your customer probably has a good reason for wanting you to send them boards without holes in the solder mask. What is their goal for the mask capabilities after you get do reworking the boards? * Cosmetic surface coat? * Performance t
Electronics Forum | Wed Feb 21 19:55:12 EST 2001 | davef
References on corrosion are: * "ASM Corrosion Handbook No. 13" [0871700077]. * "Electronic Packaging and Corrosion" ME Nicholson [0871702916]. Please explain how you determined that you have silver-sulfide contamination. Where is the silver comin
Electronics Forum | Wed Feb 21 22:08:23 EST 2001 | Dave E
Well, the vendor claims the contaminant caused the component failures. So? The only feasible possibilities would be contaminated solder paste, wash water or coating -- or maybe the problem is due to defective resistors?
Electronics Forum | Mon Apr 23 20:33:37 EDT 2001 | davef
I agree that solderability is THE issue, but we choose not to get into that pissin' contest. [We don't like the selected test method, either.] We believe that our coating thickness spec provides: * Solderability level that we seek. * Repeatable tes
Electronics Forum | Thu Jul 20 16:02:46 EDT 2000 | newf
Will component manufactuers need to look at possible new coatings for pins when to be used in a PB- free enviroment? PT 2 Will new solder joint inspection criteria have to be developed for the use of lead free solder?
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