Electronics Forum | Thu Jun 19 20:52:19 EDT 2008 | davef
Please give us more information about the source of the solder that you mention. Is it: * HASL applied by your supplier * Solder on pads after wave soldering * Solder paste after printing * Solder on pads after reflow soldering ... or what?
Electronics Forum | Tue Mar 16 18:27:34 EST 1999 | Earl Moon
| We are having a small number (~2%) of our boards pass our manufacturing diagnostics, fail once they reach the customer, fail when they get back to us and then start working again after handling them for a short time. We have eliminated a lot of it
Electronics Forum | Mon Aug 24 10:26:39 EDT 2015 | derrikf
I've recently pushed the company I work for to switch to a halogen-free solder that our supplier carries, Kester's NP 505 HR, prior we were using Kester NXG1. NP 505 HR performs great on the screen, we have a lot of down time in between prints (we d
Electronics Forum | Wed Feb 23 00:45:49 EST 2011 | tsvetan
Does someone with technical knowledge knows what exactly happend with the solder paste after the shelf life pass? What we have seen is sometimes flux separation which disapear after a good mix, and change of viscosity i.e. drying. The tin, silver and
Electronics Forum | Fri Feb 11 08:51:45 EST 2000 | HMAL
Dear Masdi, Perhaps you should check again your screen print process. Small amounts of solder paste under stencil can cause your problems. This paste is from previous printed pcb. When printing next pcb this paste attachs to places that it doesn't
Electronics Forum | Wed Aug 23 16:57:10 EDT 2000 | Dr. Ning-Cheng Lee
Regarding solder paste printing, many books available on the market all have some sections addressing this topic. Unfortunately, as of today, solder paste printing has not been the main theme of any book yet. I consider the better sources of informat
Electronics Forum | Wed Sep 01 14:23:04 EDT 1999 | Dave F
| Has anybody run across a good concise book or other source on solder paste, its characteristics, handling, storage, stencil design, printing and reflow? Yes I asking for the world! | | TX | Mark | Mark: Jennie Hwang, a sometimes SMTnet visitor,
Electronics Forum | Sun Apr 05 19:02:34 EDT 1998 | Graham Naisbitt
Peter, Take a look at IPC-ANSI J-STD-001A and B, J-STD-004 and I think, 005/006 which cover solder paste (?) I think. Whatever, they do reference one another. | Question: Whatparameters are used to determine "good" Solder Paste? What reference doc
Electronics Forum | Fri Sep 13 12:30:05 EDT 2002 | bobm
I have heard a lot of different stories about reusing solder paste. I take what is left on the screener at the end of the day (yes i try to watch the amounts that are put down)and transfer it to a clean solder paste jar. I would like to hear any inpu
Electronics Forum | Thu Aug 28 20:24:30 EDT 2003 | yukim
Hi, do you know how much the problem can be reduced by using anti-tombstoning solder paste? I tried two different lots using same solder paste (containing Ag). With one we did not see any improvement and with the other one, a lot. So, I am not quite
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