Electronics Forum | Thu Apr 15 14:09:48 EDT 2010 | richardli
We found stains on the boards come out of reflow oven. The board itself color changed to yellowish from white . We understand discolor soldermask due to high temperature. This can be acceptable by our customer not the stains. The stains look like wa
Electronics Forum | Fri Apr 16 14:01:48 EDT 2010 | richardli
It could be the flux condensed in the oven. We plan to clean the vent and filter next week. Then we see if help. I just want to see if anybody has same problem in experience. Soldermask supplier told us the same white soldermask always change to a l
Electronics Forum | Fri Nov 15 11:12:15 EST 2002 | V.RAMANAND KINI
I have tried this white s/m coating. I want some thing better. I am looking at a metal frame cover over the PCB or leave the PCB surface with HAL avoiding soldermask. Will this HAL withstand -40 to +85 deg?
Electronics Forum | Fri Apr 16 12:17:51 EDT 2010 | richardli
We have asked the supplier use whiter soldermask taking more heat. We also asked the board supplier to double coat board with soldermask. All these tries failed. We are wondering if the stains are flux contamination.
Electronics Forum | Fri Apr 16 13:22:48 EDT 2010 | stepheniii
Have you tried running a few bare boards through the oven? If there is no flux on them and you still get the "stains" then I think you can eliminate the flux as the cuprit. And I've been told that white is the second most difficult solder mask colou
Electronics Forum | Thu Jan 28 14:10:57 EST 1999 | Tom B
Hello Netters, I need some info, Earl or Dave, I have a PCB that exhibits a white layer on solder side. It does not appear to be surface residues (IPA has no effect), but looks like its under solder mask. My first guess is that the LPI solder mask
Electronics Forum | Fri Apr 16 23:33:41 EDT 2010 | isd_jwendell
If you are trying for a nice reflective surface you will get a white with better spectral reflection if you paint with an appropriate formula after the board is soldered.
Electronics Forum | Fri Apr 16 12:47:48 EDT 2010 | boardhouse
White solder mask does have a tendency to yellow within the lead free environment. so double coating will not help any. I due believe the flux is a factor in the yellowing but due to the color is the main reason. Find out what brand of S/M mask they
Electronics Forum | Thu Jan 28 15:43:16 EST 1999 | Dave F
| Hello Netters, | | I need some info, Earl or Dave, I have a PCB that exhibits a white layer on solder side. It does not appear to be surface residues (IPA has no effect), but looks like its under solder mask. My first guess is that the LPI solde
Electronics Forum | Thu Jan 28 20:00:54 EST 1999 | Dave F
| Okay, | | Another question, if the soldermask in not cured, then it is washed will water ingress (from wash or ambient ) play havoc with capacitance or dielectric of PCB. I mean will my crystal and clock circuits start "Y2K'n" on me. OR will my P
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