Electronics Forum | Mon Nov 25 09:34:52 EST 2002 | davef
You're correct excessive temperature can cause dewetting, but that usually means realeeee hot. Excessive time at above liquidous will cause dewetting also.
Electronics Forum | Tue May 31 10:58:31 EDT 2005 | davef
There are a host of possibilities. Virtually any fabrication process prior to outer layer manufacturing prior to HAL could contribute to dewetting. That goes all the way to excessive brighteners in the copper plating line. Anything that prevents the
Electronics Forum | Thu Mar 05 22:08:14 EST 2009 | mleber
The dewetting is caused by using a silcone based adhesive. Select a tape that is acrylic based. Tapes are a high esd generator. Always use an ionizer.
Electronics Forum | Thu Jan 22 03:25:26 EST 2009 | stevewilde
What masking tape can people recommend for masking the board when conformal coating. I am using a PVA autocoat machine and humiseal 1B31. Current tape, is leaving residue on board when used to hold link wires down whilst glue cures and also when used
Electronics Forum | Sat Jun 01 04:35:48 EDT 2019 | gregoryyork
Can I ask what was the organic portion and did you find any phosphorus at all as too much in the plated gold will definitely cause dewetting
Electronics Forum | Mon Jan 28 08:44:21 EST 2013 | diamondmt
John, In addtion to the cleaning process you may wnat to look at the masking materials you are using as well. Are you using any temporary masking tape? If so, do the dewetted areas coincide? Some of these tapes use a silicone-based adhesive which wi
Electronics Forum | Thu Apr 20 02:27:11 EDT 2017 | pavel_murtishev
Mile, Please tell me more about your soldering process: - Are soldering process parameters the same for all three pins? - Is unsoldered pin connected to thermal heavy copper polygon? - What is your board surface finish? HASL? - Sn/Pb or LF process?
Electronics Forum | Mon May 24 19:31:55 EDT 2010 | jry74
Can anyone give me suggestions on tape used for masking. Of course, I am looking for the "perfect tape" that sticks well, is flexible, offers lubricity for rubbing the tape, does not leave adhesive, easily removed for demasking, and won't leacvh any
Electronics Forum | Thu Feb 17 15:01:23 EST 2005 | davef
We're not familiar with your DYMAX #984-LVUF. The problem is not with your conformal coating. The problem is with your 0805 [and not all of 0805, probably just those from a specific supplier]. This lack of coverage of components is called dewetting
Electronics Forum | Wed Aug 27 15:48:05 EDT 2008 | grics
Again, our paste manufacturer specifies TAL to be 30-60 seconds. Out of curiousity, how would part placement cause de-wetting? I am fairly new to SMT so elaboration would be helpful... Thanks
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