Electronics Forum | Thu Jun 11 22:57:45 EDT 2009 | davef
NASA recommends baking a PCB for a minimum of 4 hours at 93+/- 5.5�C before conformally coating. [NASA-STD-8739.1, �Workmanship Standard for Staking and Conformal Coating of Printed Wiring Boards and Electronic Assemblies,� August 6, 1999]
Electronics Forum | Thu Apr 01 22:59:00 EST 1999 | jackie hsieh
dear all: we use the HCFC,manufactored by 3M,for the ultrasonic stencil cleaner.but it's too expensive to us. I think is it possible to use no-volatility liquid for the ultrasonic stencil cleaner? or other solvent? thank for your help jackie hsieh
Electronics Forum | Fri Apr 05 16:31:55 EDT 2019 | slthomas
Never heard of such a thing. Are you sure the coating isn't just making the solder balls more prominent? Where are the "new" solder balls appearing after coating?
Electronics Forum | Thu Apr 21 11:43:03 EDT 2005 | davef
We understand the problem of trying to coat over RTV. We have seen the same problem with acrylic and urethane coatings not wanting to stick to RTV. Some acrylics seem to be worse than urethane. Since this is a new product, may be you could pot your
Electronics Forum | Thu Apr 21 12:35:15 EDT 2005 | jdumont
Well that doesnt sound very promising. What im going to do is make sure these two boards I just coated (with the RTV already cured) will be used in house only. In the future we will do any conformal coating operations before potting with whatever mat
Electronics Forum | Thu Apr 28 11:14:27 EDT 2005 | bbarr
If you apply the RTV after coating, what happens to bond strength since you are now bonding to the coating and not the board? Will the caps still survive vibration and shock? I specify applying RTV before coating for this reason. Am I correct? I als
Electronics Forum | Tue Aug 11 15:13:05 EDT 1998 | Xingsheng
Hi, can you please tell me how to make green coating and through-hole plating of PCB? Thanks! Xingsheng
Electronics Forum | Fri Apr 05 15:24:14 EDT 2019 | sever_83
What can cause solder balls to appear after conformal coating? Using Dymax 9-20557, light curing for 1.5 mins. Can too much heat from light cure cause solder balls?
Electronics Forum | Thu Apr 21 17:22:29 EDT 2005 | davef
We prefer epoxy.
Electronics Forum | Thu Apr 21 10:44:35 EDT 2005 | jdumont
Morning all. So today I have been tasked with conformally coating a few of our first run PCBs for a new product line. The problem is that they have already had all the larger caps potted with RTV. Are there any problems with spraying the CC over the