Electronics Forum: conformal and coat and gasket (Page 1 of 5)

silicone conformal coat and electrical contacts

Electronics Forum | Fri Jan 26 13:26:30 EST 2007 | rw

We are developing a new product that requires conformal coating on the motor controller. We selected a silicone based conformal coat due to its ease of use. There has been disagreement among engineers as to its impact on the motor. We have contact

silicone conformal coat and electrical contacts

Electronics Forum | Thu Feb 01 09:46:54 EST 2007 | blnorman

Especially VCM - volatile condensable materials. Strictly verboten around optics.

silicone conformal coat and electrical contacts

Electronics Forum | Mon Jan 29 20:25:24 EST 2007 | davef

We allow no silicone in our shop, because they ruin solderability.

silicone conformal coat and electrical contacts

Electronics Forum | Wed Jan 31 17:01:34 EST 2007 | rw

I'm not that concerned about the solderability of the motor. Our customer is concerned about the outgassing of the conformal coat effecting the motor brushes. Silicone will break down into SiO2 and SiC will result from a spark between the brushes a

silicone conformal coat and electrical contacts

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

silicone conformal coat and electrical contacts

Electronics Forum | Tue Jan 30 18:34:56 EST 2007 | realchunks

Hose and/or Dave, Please elaborate of how the silicone can affect soldering. Material itself or fumes?

silicone conformal coat and electrical contacts

Electronics Forum | Thu Feb 01 08:47:07 EST 2007 | davef

NASA is concerned about outgassing in high-vacuum environments. They select materials to minimize outgassing. http://outgassing.nasa.gov/og_desc.html

silicone conformal coat and electrical contacts

Electronics Forum | Fri Jan 26 16:47:35 EST 2007 | electronhose

IMHO I would avoid sprayed silicones like the plague. They can travel around your facility and cause solder wetting issues that you will never know the root cause for. Also found this e-drive article on using silicones around motors and relays. Loo

silicone conformal coat and electrical contacts

Electronics Forum | Wed Jan 31 14:07:24 EST 2007 | electronhose

Material, fumes, cured or uncured, all are suspect. Silicone gets on an operator's hands, that operator handles components ( even a day or more later ) silicone is transferred to the solder connections = contamination. Process and workcell control

silicone conformal coat and electrical contacts

Electronics Forum | Tue Jan 30 20:38:32 EST 2007 | davef

NASA Internal Advisory: NASA-Issued Return to Flight Wristbands Contaminated with Silicone [snip] 10. PROBLEM DESCRIPTION: Recently we have been made aware of a silicone problem associated with the "Return to Flight" wristbands. These wristbands are

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