Electronics Forum | Mon Mar 13 09:09:37 EST 2006 | russ
Our PCB also had this process.
Electronics Forum | Mon Mar 06 09:19:50 EST 2006 | russ
I have had the purple silkscreen, I don't remember the exact details but it was from either an incomplete cure or a mixing issue. End result was no problems just looked funny.
Electronics Forum | Sun Mar 12 18:20:08 EST 2006 | jldowsey
Thanks Russ. As it turned out, it was an incomplete cure at the fab house. Rhey sent another fab over from the same lot that had sat for 3 more days, and it came out lavender instead of purple! have a good one!
Electronics Forum | Fri Sep 14 17:50:54 EDT 2007 | ratsalad
I remember reading about this in the forums before. Search for silkscreen in the forums, and you will find the thread I am thinking about. http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=10013&#Message40186
Electronics Forum | Sat Mar 04 13:26:41 EST 2006 | jldowsey
Something unusual happened yesterday, we reflow soldered two boards with white silkscreen legend, and they came out of the oven with purple silkscreen legend. Not tan or brown from overheating, but purple. The boards were reflowed on their normal pr
Electronics Forum | Mon Mar 06 07:42:48 EST 2006 | davef
Epoxy inks tend to be more resistant to discoloration than the acrylics that are used more widely now. The acrylic-based inks vary in their ability to maintain color after heat cycles. The technical data sheets from the ink supplier should indicate:
Electronics Forum | Sun Mar 12 19:09:45 EST 2006 | cmiller
We had the same issue on a batch of boards and the board house concluded it was because they did the sikscreen before the imersion gold. (which was done out of house-which is very undesireable). I never knew if this was really the case but thought I
Electronics Forum | Sat Aug 21 17:10:12 EDT 1999 | K. Vikas Sharma
| | Want to know the Tools/ Process required to get started with CSP prototyping and R & D. | | Anyone working on this , please help out. | | | Depending on the type, size, and pitch - just like BGA's, they aren't tough. Our 1mm types went through p
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