Electronics Forum | Wed Sep 09 12:20:28 EDT 2009 | richardli
What is the cause of this discoloarion? Soldermask masterial wrong? Thanks.
Electronics Forum | Fri Apr 16 11:51:26 EDT 2010 | shawnvike
Looks like a simple variance in the solder mask discoloring. Shawn
Electronics Forum | Mon Dec 30 23:51:13 EST 2013 | vileo72
Hi Dave , Thanks and will align accordingly .
Electronics Forum | Wed Apr 10 17:05:47 EDT 2019 | davef
I wonder if this discoloration isn't delamination. I'd discuss it with my board fabricator.
Electronics Forum | Fri Feb 10 15:19:28 EST 2006 | Chunks
Wow, how people get off track. You'll probably see OK joints, but the flux will be burt. Your boards will prob. discolor and possibly delaminate. Some of your parts amy discolor too. Depending on your paste, you will probably see some balling/bea
Electronics Forum | Thu Apr 20 22:14:51 EDT 2006 | raquel
hello! need ur inputs... if the Matte Sn pbfree finish of the component discolors AFTER having been exposed to bake, or, after reflow, will the base leadframe have any potential contribution to it? i know most likely suspects would be the plating pro
Electronics Forum | Mon Jul 24 11:35:42 EDT 2006 | Jimk@ics-inc.org
We have experienced a problem with tin leaching or discoloration of lead terminals on random parts on solder side of a paste/paste operation. The profile has been used on previous production runs and there doesn't appear to be any heat damage to othe
Electronics Forum | Fri Sep 12 17:58:30 EDT 2008 | robinj
Can someone let me know what is causing this black coloration around the pads? It is on the edge of all pads all over the board. The surface finish is OSP. I don't have any solderability issue. But the stencil printer is having trouble with picking u
Electronics Forum | Mon Aug 29 22:48:09 EDT 2011 | davef
Rich Here's what Humiseal says: Thermal Properties The coating must be able to withstand localized thermal 'hot spots' generated by components. High temperatures can cause short-term changes in coating characteristics, such as softening and lowered e
Electronics Forum | Fri Sep 02 16:30:02 EDT 2011 | duso02
Rich That is a standard reaction with Humiseal 1A33, nothing to worry about. Find a board that was coated over year ago and had been heated up at all and it will be an amber color. It does not violate the IPC for discoloration. We have coated boards
