Electronics Forum | Fri Feb 02 08:36:14 EST 2007 | CK Flip
Wow, I cut first cut my teeth in the Industrial motor control industry. My 1st company made motor control products like variable speed drives, solid state overload relays, soft starts, etc. and in our shop, we used nothing BUT Dow Corning silicone p
Electronics Forum | Fri Aug 06 11:25:48 EDT 2021 | stephendo
You really need your customer to provide a drawing of coated, keep out, and don't care. People new to coating don't realise the importance of having a don't care buffer area around the keep out areas. And conformal coating wicks up leads quite easil
Electronics Forum | Thu Sep 09 10:50:59 EDT 2004 | agkettle
Does anyone have any experience with underfill of HD connectors? New customer wishes to underfill 6 HD connectors that have been pressed into PCB. Capillary action is causing the conformal coat to wick up into connector. Material is acrylic.
Electronics Forum | Tue Nov 01 09:16:03 EDT 2011 | austinpeterman
Hello, Looking for a solution to silicon conformal coating wicking up into connectors. We build IPC-A-610 class 2. We are using a PVA 650 with Dow Corning 1-2577 conformal coating. We have solder joints that must be coated 1.25mm from the connecto
Electronics Forum | Wed Sep 14 15:42:45 EDT 2011 | nowak18
During temperature cycling we have determined that the conformal coating wicking underneath our BGAs has caused fractures in our solder balls. One proposed solution is to run an RTV dam around the parameter of the BGA to prevent the CC from wicking u
Electronics Forum | Wed Jan 31 10:56:23 EST 2018 | dontfeedphils
I'm working on bringing up a new conformal coat process/workcenter and have a few questions I'm hoping someone might have experience with. Right now we're manually spraying both coating materials (1B31 and 1A33 from Humiseal) using HVLP guns. I run
Electronics Forum | Tue Nov 01 10:06:00 EDT 2011 | davef
Humiseal says: Typically, there are three main approaches to avoid coating wicking into press-fit connectors (and other keep out areas). Wicking is a phenomenon caused by a combination of low viscosity of conformal coating material and strong capilla
Electronics Forum | Tue Apr 07 20:06:27 EDT 2009 | davef
We doubt that HASS has much to do with your conformal coat peeling. Sure, poor wicking [low surface energy] could cause the issue that you see. Here are links to a couple of good [no formulas or differential equations] articles on surface energy: * h
Electronics Forum | Tue Feb 06 16:36:51 EST 2018 | dontfeedphils
For anyone looking back on this post, I ended up figuring out something that will work for my process. Jack up the atomization pressure on the guns, lower material flow, quicker-lighter coats, less time between coats, and more coats. Smooth, even f
Electronics Forum | Tue May 25 13:03:35 EDT 2010 | jdumont
Hello, I have no experience with CE-1155 but a ton with 1B73. I would say Justin hit it right on the head. 1B73 does not like to be anywhere near silicone residues. We make sure the boards are handled with gloves after wash, before coat. Unfortunat
