Electronics Forum | Tue Dec 28 03:59:06 EST 2010 | riscy00
I'm investigating heat transfer by 1st order approximation between PCB and ambient air via encapsulate material (epoxy or gel or silicone), they have thermal conductivity of 0.2W/C but it hard to find specific heat capacity and density. Has anyone
Electronics Forum | Tue Jan 30 14:12:12 EST 2007 | blnorman
We use nothing but silicones and have for at least the last 7 years. We don't have relays, but we do have motors. No issues with soldering, but our lines are constructed such that the last solder operation is a good distance from the coating or pot
Electronics Forum | Wed Jul 06 15:52:36 EDT 2011 | duso02
Ricky What silicone coating are you using? Are you using at as a coating or as a potting? In other words how thick are you applying it.
Electronics Forum | Mon Jan 29 11:52:55 EST 2001 | blnorman
We have been using a VOC-free, no-clean flux on our boards that we conformally coat with no problems. We're using both a UV cured and a heat cured Silicone conformal coating. One thing to beware of is inhibition in the silicone. We found that out t
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 | Thu May 17 15:17:42 EDT 2001 | blnorman
Parylene is arguable the best conformal coating there is, unfortunately it's also the most expensive. We had considered using it some time back, but due to environmental and safety issues, we would have had to build a new building to house the proce
Electronics Forum | Wed Apr 19 16:43:05 EDT 2006 | samir
Silicone-based coatings "repel" most foreign,non-compatible materials like peelable solder mask, and rubber or vinyl boots. The result is, uncured material around the vicinity of where the boot was. Trust me. Been there and done that. As a rookie
Electronics Forum | Wed Mar 02 07:47:57 EST 2016 | deanm
Sounds like over molding would be ideal, but if they don't want to spend for a mold I would look at silicone conformal coatings that can be used in a dip process. Silicones are thicker than other coating materials and multiple drippings may provide t
Electronics Forum | Wed Aug 14 13:39:59 EDT 2013 | eadthem
Most of this you have probably covered, but these are what have caused heating issues for us in our 1707 EXL. First, you would probably notice, but check that all blowers are turning by looking at there cooling fans in the top and bottom, Our 170
Electronics Forum | Tue Nov 15 14:31:59 EST 2005 | Samir Nagheenanajar
Back in the days when I was in charge of a Paintline Dip conformal coater, I had the same issue with a non-hermetically sealed Potentiometer. We tried to use rubber boots, but the capillary/wicking action of our silicone-based heat cured coating was
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