Electronics Forum | Tue Feb 08 17:23:55 EST 2011 | bandjwet
Has someone had really good experience with the softening of silicone conformal coating using a specific chemical? One of our clients just came in with a board with Dow 1502 silicone coating on it. We generally mechanically remove the coating for re
Electronics Forum | Mon Aug 29 22:48:09 EDT 2011 | davef
Rich Here's what Humiseal says: Thermal Properties The coating must be able to withstand localized thermal 'hot spots' generated by components. High temperatures can cause short-term changes in coating characteristics, such as softening and lowered e
Electronics Forum | Wed Aug 02 05:27:00 EDT 2017 | tmennink
We did this test, we opened the tape and turned it upside down, indeed some leds were staying inside the tape. We will try placing them next week with a fuji NXT line. We also contacted the manufacturer, apparently heat perhaps during transport coul
Electronics Forum | Fri Sep 14 07:46:34 EDT 2018 | charliedci
If it is "wondermask" made by Techspray, it is supposed to be water soluble. It being overcured (we have experienced this before), water will not touch it. We used acetone which softened it up to remove it with an orange stick. We apply it ourselves
Electronics Forum | Thu Jan 13 12:51:30 EST 2000 | Dave F
David: I'd suggest: 1. Cutting and not bother desoldering all leads (to save the pads). Trust me, desoldering is not as easy as some would lead you to believe!!! 2. Levering that puppy offa there with a screw driver and some "padding" to protect t
Electronics Forum | Fri May 25 00:31:07 EDT 2007 | Mike Konrad
Never use a water softener for defluxing. They add sodium to the water which is bad for boards. The white residue may be flux. If that's the case, either the dishwasher is not powerful enough or the wash water is not hot enough. Another possibili
Electronics Forum | Mon Aug 06 09:55:32 EDT 2012 | dyoungquist
Techspray makes a liquid called "Eco-Stencil SMT Stencil Cleaner" and also pre-saturated wipes by the same name. We spray the cleaner on the stencil and then use the wipes to clean the paste off of the stencil. Putting 1 wipe in each hand and rub
Electronics Forum | Sat Jan 06 22:09:53 EST 2001 | Greenman
Cory, I've got a lot of experience of testing of this type. The physical (not chemical) nature of the flux residues is the crucial issue in compatibility. If you have a softer residue (either caused by a thick initial solder paste deposit, or a low p
Electronics Forum | Thu Oct 26 09:10:30 EDT 2000 | ptvianc
I am not familiar with the "HALT" terminology. Do you mean HAST testing? As for thermal fatigue, the most severe conditions are typically those cited for military and/or satellite applications. There are several temperature ranges that are used to
Electronics Forum | Fri Jun 19 15:17:54 EDT 1998 | Chris Jackson
We are in the process of validating Silicon 1C55 (thermal cure) conformal coating over Alpha LR725 solder paste. I am looking for anyone who may be using this process, or has been exposed to someone who is doing this process. Our concern is with the
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