Electronics Forum | Tue Feb 03 11:42:54 EST 2009 | lmartenson
We use PVA and I have had bubbles that came from the pressure in the pressure pot being to high. Also the material filter was slightly clogged. I'm not sure of your setup hope this helps.
Electronics Forum | Thu Nov 25 05:01:05 EST 2010 | raghu
Thanks for your reply sir... Please tell me, materials you have suggested are reworkable or not...?
Electronics Forum | Thu Mar 24 15:54:43 EDT 2011 | davef
You're correct. There's no point in conformal coating a board that you intend to pot. We're aware of no IPC [or IPCish] standards or guidelines for potting or encapsulation. We'd guess that materials and / or equipment suppliers would be the best pl
Electronics Forum | Tue Jul 05 17:43:43 EDT 2011 | davef
We agree. As Bill says, given that you seem to have bubbles in a restricted area and not broadly dispersed across your board, this seems to indicate an interaction between process materials, rather than a cure or thickness issue.
Electronics Forum | Fri Nov 04 16:36:53 EDT 2011 | davef
tombstonesmt: Ammonia based masks can create solderability issues after they are removed. You can get non-ammonia based latex mask material but down side is slower cure and cost a little more as they have higher levels of latex etc
Electronics Forum | Mon Feb 25 03:45:57 EST 2013 | odedkal
Hi Davef, The question is which product is better ? Do you know if there is some kind of research regarding these (or maybe others)materials ? best regards, Oded
Electronics Forum | Mon Jun 18 14:35:40 EDT 2018 | davef
That's a reasonable question for a supplier to ask his / her customer. It depends ... It depends on the materials use in the process the assembly and the reflow temperature recipe
Electronics Forum | Thu Aug 20 07:31:07 EDT 2020 | sssamw
It depends on what material you used, but normally viscosity, adhesion, thickness and coverage is usually being inspected in production.
Electronics Forum | Wed Feb 20 10:12:27 EST 2013 | dontfeedphils
Hey Bill, it really depends on the material you're looking at using UR, SR, AR, the easiest to deal with being AR, although if you can find a UR that doesn't clog up the machine too bad those are usually more viscous and easier to apply selectively u
Electronics Forum | Fri May 18 10:43:32 EDT 2012 | davef
Umar Chapter 7 of IPC-HDBK-830, Guidelines for Design, Selection and Application of Conformal Coatings deals with compatibility of the different materials in the chain. Have you: * Tested your bare boards at incoming for cleanliness with your Omega
