Electronics Forum | Wed Apr 22 12:22:46 EDT 2020 | mvargas
Hi, We are currently using WonderMask PX Peelable Solder Mask # 2222 for the wave rework process, but we are having a lot of trash in the pot. I understand that it is because the solder mask resists the pot temperature (500F) but not the rework tim
Electronics Forum | Sun Sep 08 15:07:42 EDT 2013 | davef
PCB designers specify the application of solder mask [eg, varnish, solder stop mask, solder resist, etc] to fabricators to reduce the potential of bridging between two conductive traces during assembly soldering processes [eg, wave, reflow and hand s
Electronics Forum | Fri Apr 26 12:35:05 EDT 2002 | blnorman
Sounds like the mask wasn't properly cured. What kind of solder mask is it? We use a photoimageable mask on our boards. The secondary cure is ~ 90 minutes @ 150�C. One of the cured mask tests is solder bath resistance where it has to resist degra
Electronics Forum | Tue Aug 27 22:07:45 EDT 2002 | davef
Pad. Land. A portion of a conductive pattern used as a termination area. Metal surrounding a hole on a printed circuit board. Mask. A material applied to allow selective etching, plating, or protection of the surface of a printed circuit board.
Electronics Forum | Thu Apr 05 11:48:25 EDT 2012 | pbarton
Are you running individual point soldering on each component lead, of are you drawing lines with the solder fountain to increase the speed of the process? Could be that if you are drawing lines, coupled with the very low flux levels you say you are
Electronics Forum | Tue Dec 22 12:32:16 EST 1998 | Earl Moon
| Folk's, | I'm in need of some help / direction. I'm working on my thesis for a masters based on looking at the effect's of the solder resist promoting / reducing the amount of solder ball's during wave. I'm looking at thing's like colour, texture,
Electronics Forum | Wed Dec 24 16:05:14 EST 2003 | pdeuel
Kapton tape is heat resistant to tempratures accociated with wave solder process. If your process is not no clean then masking compound will work.
Electronics Forum | Wed Mar 11 18:28:03 EDT 2015 | gregoryyork
Hi its undercured solder resist which leaves a clear waxy/oily residue and can be seen as brown tar/oil in the molten solder wave. This also causes MicroSolder Balling and some snail trails of solder pick up and worst case bridging and peeling resist
Electronics Forum | Sat Aug 12 09:23:02 EDT 2000 | Dave F
Peter: Most of the stuff you read on BGA was purloined from a single document written by Motorola. Amoung the things it discusses are solder mask defined and nonsolder mask defined pads. Check it out:
Electronics Forum | Wed Oct 24 18:09:44 EDT 2001 | davef
Allowing the board fabricator to define the board you expect to receive is fine, as long as they do a good job. Regardless of the existence of a clear product definition or not, it�s reasonable for you to argue that your receipts must meet the requi
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