Electronics Forum | Thu Nov 19 22:48:22 EST 2009 | davef
Since the bubbles: * Are only on the solder connection, we'd guess there must be some compatibility issue between the flux residues and the conformal coat materials. * Occur after curing, we'd guess the cure recipe is too rapid and is entrapping voli
Electronics Forum | Fri Dec 17 03:37:42 EST 2010 | tselvan
I am facing bubbles issue in RTV process on IC location,ie in between lead,whats the root cause& how to avoid? Is it will affect the reliabilty?
Electronics Forum | Tue Mar 01 15:33:35 EST 2011 | jlawson
If I assume you running a selective coating machine ? Maybe you have small leak and system is sucking in air creating bubbles in mixture, like a sort of venturi action, just idea, can be a faulty fitting , elbow etc. Have had this before....
Electronics Forum | Tue Jul 05 16:14:06 EDT 2011 | blnorman
Is this an addition-cure silicone? We once had coating bubbling caused by the evolution of the solvent in the paste flux under leadless components.
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 | Tue Sep 20 05:21:41 EDT 2016 | abhilash4788
Hi, Currently we are facing bubble formation in conformal coatings in the pcba. Have varied various specs of the conformal coating machine, even during manual application also having the same issue. the material used is silicone conformal coating. N
Electronics Forum | Tue Dec 02 14:31:48 EST 2008 | dontfeedphils
Hey guys, just joined the site and I'm looking for some help. In our coating department we are running a Asymtek C-740 with a Jet and film coater. The coating that we are using is Humiseal 1B73 acrylic. The problem that we are having is that the C
Electronics Forum | Tue Feb 08 14:23:47 EST 2011 | dennisfo
Conformal coat bubbles using 1B73 and SC-205 nozzle I've read most of the posts on this subject. I'm using the SC-205 (airless) fan nozzle and 400 needle to apply 1B73 mixed with xylene thinner. I have micro bubbles which come directly out of the noz
Electronics Forum | Mon Jul 14 12:55:07 EDT 2008 | arminski
I have a board with the above problem from our PCB supplier. After they applied the solder mask and run the PCB's to HASL process, the solder mask bubbled on one side of the PCB making the solder mask thickness higher and PCB looking awkward. They s
Electronics Forum | Fri Oct 09 16:07:30 EDT 2009 | dlabelle
We use Dow 2620 silicone conformal coat applied with PVA1000 sprayer machine. If used on a daily bases, we have no problem. If we let the machine sit idle for over a week, we will get bubbles in the conformal coating. Sometimes, purging the line w
