Electronics Forum | Wed Nov 04 17:11:25 EST 2009 | davef
What is the advantage of asphalt versus potting compound?
Electronics Forum | Tue Sep 10 17:40:14 EDT 2013 | caurbach
Let me start off by saying that although we pot a decent variety of products, we have never been asked to do something like this, so this is not based on personal experience. This is just my gut talking here. I suppose you could use some sort of ca
Electronics Forum | Thu Feb 08 12:09:06 EST 2001 | BLNorman
Potting compounds and conformal coatings. Any 1 or 2 component liquid thermoset material.
Electronics Forum | Thu Mar 31 20:50:13 EDT 2011 | tkirk
I disagree with the others about conformal coating before potting. Some of the softer urethane potting compounds can absorb water leading to caustic nastiness in the voids under the parts. Conformal coating can help fill/seal the voids and keep the n
Electronics Forum | Tue May 06 15:53:52 EDT 2003 | bremerg
The coating is pliable and is air cured for 24 hours. The potting compound goes into the top assemnbly in 3 diferent stages. The circuit boards are coated using urethane type conformal coating. The unit is also placed into an ESS chamber -40� to +
Electronics Forum | Mon Feb 02 05:08:37 EST 2004 | heccles
Anybody seen problems with potted trimpots and reflow soldering - specifically poor wetting as a consequence of lead contamination from the potting compound. Regardless of reflow profile used (MIL -STD -202) cannot get a good joint formed ! If you us
Electronics Forum | Mon Feb 02 16:47:33 EST 2004 | davef
If you have potting compound on your solderable surfaces, you can develop reflow recipes until they are picking cotton on Antarctica and they will not take solder. You should: * Tell your buyer [customer] not to purchase parts with unsolderable lead
Electronics Forum | Fri Jun 25 14:39:59 EDT 2004 | Hoss
Any chance your potting compound was changed in the timeframe mentioned or the unit(s) were used under high heat stress conditions? If significant thermal expansion of your potting material happened and it is a hard durometer, it could shear at your
Electronics Forum | Mon Feb 26 09:36:08 EST 2001 | blnorman
ASTM E 443 is a test for sulfur by Oxygen Flask Combustion. Other instruments will detect sulfur (I assume a SEM with EDS capability will pick up the sulfur). We had an addition cure silicone potting compound inhibition problem last year that was t
Electronics Forum | Tue Jan 24 21:07:17 EST 2006 | davef
We all genuflect to Graham Naisbitt, a generous contributor to SMTnet. Moisture-curing urethanes may form minute bubbles if the coating is too thick or the coating environment is too humid. So, tell us more about your urethane and the method you u
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