Electronics Forum: silicone potting causing contamination (Page 1 of 6)

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

Lead contamination in wave solder pot...

Electronics Forum | Tue Feb 08 11:09:44 EST 2005 | jdumont

Hi all, we're preparing for the switch to lead free and I was wondering how dangerous/harmful to our new wave oven it would be to run tin lead parts through the no lead wave. Will the lead build up and cause issues?

Conformal coating

Electronics Forum | Fri Dec 10 12:24:46 EST 2010 | davef

Causes of dewetting in conformal coating. Factors that influence dewetting usually involve non-ionic contamination such as: * Residues from board manufacture including silicone surfactants from solder resist & HASL rinse contamination * Component res

Silver Sulphide Contamination of Resistors

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

Paint flaking from Lead Free solder pot

Electronics Forum | Fri Sep 08 11:50:39 EDT 2006 | Rob

SN100C is designed not to corrode your pot, and can be used on standard solderpots (after a proper clean out), whereas SACX is still corrosive and if the coating is compromised then could cause problems. Get it in writing from the supplier that the

Solder balls

Electronics Forum | Thu May 03 10:14:10 EDT 2001 | davef

Now, I'm not going to talk solder balls, in a traditional sense. I have an image of bilbous, globs of excess solder near the ends of PTH leads. If that's not what you have, ignore the following [and help us understand your situation better] ... Yo

Gold contamination: MOSFET lead pre-tinning

Electronics Forum | Thu Sep 02 21:51:54 EDT 2004 | davef

Curious, but thoughts are: * Your pretinning pot is loaded with gold that has been removed from lead over a period of time * Your failed solder connections are caused by something else other that gold intermetallics * Your tinning process is undiscip

Reflow Oven Chain Lubrication

Electronics Forum | Sun Oct 13 22:19:28 EDT 2002 | mikestringer

Hi Everyone What lubricants do your maintenance people use for the chains in your Reflow ovens? The manuals for our ovens have one recommendation - but I am always open to other people�s experiences and recommendations. Another option may be easie

Re: Dross Removal

Electronics Forum | Tue Dec 12 13:33:52 EST 2000 | justin medernach

Dross removal is dependent upon the "activity" in your solder pot and the usage of a inert or an "air" atmosphere. The more moving that agitate the solder, the more dross. Basics first and then the answers will make sense. What is dross? Oxidatio

problem in solderability

Electronics Forum | Wed Sep 10 14:14:03 EDT 2008 | gregoryyork

Yes why did the Electroless Nickel layer split this is the ROOT cause. My guess is still that the resist was slightly miss registered over the copper and therefore poor adhesion of the Nickel ensued OR like I said originally the resist had contaminat

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