Electronics Forum | Mon Jul 04 14:21:14 EDT 2011 | davef
The three primary causes for bubble generation in solvent-based coatings are: * Air entrapment * Solvent flash-off * Curing the coating too quickly Tell us more about your process including: * When you first notice the bubbles * Extent of the probl
Electronics Forum | Fri Oct 18 12:40:35 EDT 2013 | robertwillis
Back in the mists of time there were two papers on the use of Parylene Coating and the improved thermal cycling results in 1990. It was on LCCC then shortly after on BGA. Does anyone know of results of recent trials or have a copy of the BGA papers.
Electronics Forum | Mon Apr 17 14:43:35 EDT 2017 | davef
Measurement of Conformal Coating thickness on Printed Circuit Boards [ http://www.defelsko.com/applications/conformal-coating/printed-circuit-boards.htm ] I receive no benefit from the supplier mentioned above. IPC-HDBK-830A, 8.11.1 talks to measu
Electronics Forum | Thu Nov 20 08:41:12 EST 2008 | grics
Good morning SMTNET FORUM!!! Its been a while since I have been on. Good to see people are out there still helping other people. I have a question... What is everyone using for Coating Dry Film thickness verification? We are using micrometers. My
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 | Mon Jul 23 16:17:19 EDT 2007 | mleber
We have not had the best of luck with wet film. I agree on your statement. Depending on the mix and amount of solvent your results will vary. We were looking for something easy, accurate and foolproof.
Electronics Forum | Tue Jul 24 13:41:41 EDT 2007 | jdumont
We just measure the coupon before and after. We are always btw .002" - .003" acrylic. No auditor will say a word if you are doing this much control. Unless its NASA I suppose..... we've never had a problem with any of the avionics guys doing this tho
Electronics Forum | Thu May 10 10:46:18 EDT 2012 | davef
Here is a thread on SMTnet that discusses a similar topic http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=13494&#Message57442
Electronics Forum | Wed Sep 08 20:22:38 EDT 2021 | emeto
Hello, do you perform any stencil maintenance? What type of controls do you use? Also interested if you have a way to measure nano coating thickness? Any ideas will be appreciated.
Electronics Forum | Thu May 02 10:25:14 EDT 2013 | wahahasteven
we have a Specialty coating system (SCS) precisoncoat spray coating system. we are using an acrylic coating material with about 80cp viscosity. The spraying pressure is around 4-6 psi. The main issue is the finish looking of the board. If we apply hi
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