Electronics Forum | Tue May 02 14:19:26 EDT 2000 | Bill Schreiber
There are two primary causes of epoxy adhesive bond failure, heat and over exposure to moisture. Ultrasonic cavitation is a only a mechanical "scrubbing" action on a microscopic level. However, if the adhesive bond is week or has small areas of det
Electronics Forum | Tue Nov 16 14:10:30 EST 1999 | Bill Schreiber
According to a paper by Richard Clouthier, published in 1996, there are two major factors about normal cleaning chemistries that may affect stencil adhesives. 1) Elevated temperature above 110 degrees F. (45 degrees C). Stencil adhesives are heat c
Electronics Forum | Fri Mar 09 17:49:08 EST 2007 | Frank
Thanks, Michael, this proves my point. There are already shows everywhere, so if you don't want to fly to LA and get "shot at", by all means, go to your local show. If enough people stop going to APEX (SoCal) then the other shows will gladly take u
Electronics Forum | Thu Jun 15 21:51:17 EDT 2000 | Dave F
Jeff: You're correct �7.1.3 of ANSI J-STD-001C states " Drying / Degreasing states the assembly may be treated to remove moisture and other volitiles." We don't bake "FR4" for love nor money. The archive are littered with threads along this line.
Electronics Forum | Tue Nov 29 12:53:56 EST 2005 | bschreiber
Hello Billy, You are correct when you say that you may want to look at the detergent (chemistry) you're adding to the stencil wash. However, "geared for epoxy removal" depends on how the chemistry is designed to remove the epoxy. If it is a "water
Electronics Forum | Fri Dec 07 12:14:18 EST 2012 | sarason
A few years back I got a splinter of steel in my eye which destroyed my super good eyesight. Which now means it is difficult for me to work in electronics. The pain of steel was difficult to explain but, a year earlier I had a nail shot into my finge
Electronics Forum | Mon Feb 19 13:04:17 EST 2001 | billschreiber
The ultrasonic frequency used in today�s stencil cleaners is usually a 40 kHz �sweep� frequency (also used on semiconductors and other sensitive cleaning applications). This frequency is not low enough to cause stencil damage (the lower the frequen
Electronics Forum | Thu May 20 15:07:12 EDT 1999 | JohnW
Earl, your colourful impressive descrptions are a joy to read..well lighten's up my day but maybe it's just me...ummmm..? anyhoo, Omat, as Earl has said ..this is a moisture sensative problem basically the reason you blow the shit out of the compon
Electronics Forum | Sat May 22 19:38:59 EDT 1999 | Omat Marasigan
| Earl, | | your colourful impressive descrptions are a joy to read..well lighten's up my day but maybe it's just me...ummmm..? | | anyhoo, Omat, as Earl has said ..this is a moisture sensative problem basically the reason you blow the shit out of
Electronics Forum | Fri May 28 16:30:39 EDT 1999 | JohnW
| Yes l know this problem keeps cropping up on the forum but l've missed some of the follow-ups. | | Our problem is that the lifting only occurs on 3% of production so actually detecting an improvement is difficult. We're actually having to inspect
