Electronics Forum | Tue Nov 13 22:40:02 EST 2012 | davef
I expect that suppliers can just about always hold solder mask registration within a true position of 3 thou. That's the old SMT padstack think ... make the solder mask openings extend 3 thou larger than the copper. That way, even if the copper and t
Electronics Forum | Fri Mar 15 16:26:04 EDT 2013 | hegemon
Mask the pad on the PWB using liquid solder mask. Cure the mask and away you go. Use a mini stencil and a squeegee to maintain planarity and minimize issues at paste print. We have used this technique before. In other cases we have masked the bott
Electronics Forum | Wed Jul 06 06:17:11 EDT 2016 | pavel_murtishev
Dear members, Recently we have found that solder mask thickness variation could lead to solder balling under QFN packages for a high reliability device. Is there any industry proven method for solder mask thickness checking? Any equipment or any me
Electronics Forum | Mon Sep 24 11:28:55 EDT 2018 | etmpalletguy
Use a solder pallet, the pallet will mask off the locations required, thus eliminating the need for any kind of masking!! You've eliminated the need to apply, but you still have to peel off, not much of time saver. Pallets can be used for batch or s
Electronics Forum | Thu Feb 22 15:04:12 EST 2001 | markkrmp
I have been reballing some BGA's. Some of the BGA's have solder mask damage and cannot be recovered until I find a way to reapply the solder mask. Are there any suggestions?
Electronics Forum | Tue Dec 14 11:17:45 EST 1999 | John Thorup
Hello Mike You'll have to be a bit more specific. Do you mean permanent solder mask like the normally green material or a temporary mask like the peelable/washable material? John Thorup
Electronics Forum | Thu Oct 07 22:05:23 EDT 1999 | Dreamsniper
Is there an IPC Standard stating the max. number of times that a PCB can pass through a reflow or wavesolder machine without having solder mask breakdown. PCB is FR4 Solder Mask is LPI Reflow and W/S Profile = Standard thanks and regards,
Electronics Forum | Thu Aug 27 21:59:56 EDT 1998 | Xingsheng
Hi, Friends, Could you please recommend me some solder mask materials and equitements for high quality solder mask? Details such as company name, phone numer et al are welcomed. Thanks! Have a good day Xingsheng
Electronics Forum | Thu Dec 13 15:14:07 EST 2001 | cc
Does anybody know what is the nominal thickness for via masking and is there a set max.? I recently have some bridging on some fine pitch components and my suspicion is that the new fab with new via masking is the culprit. Thanks CC
Electronics Forum | Wed Dec 18 08:38:17 EST 2002 | davef
Thanks Tim. Additional thoughts are: * We've talked here on SMTnet about hole fill previously. * That your ability to get hole fill is probably limited by mask in the hole makes us very uneasy, because hole could have varying levels of solder mask i
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