Electronics Forum | Thu Aug 27 08:34:50 EDT 2009 | floydf
I am having trouble with little air bubbles in my conformal coat. It ranges from a few pin sized bubble to looking like spit. We are using Dow 2620 silicone conformal coat applied with a PVA sprayer machine. The conformal coat comes in bladder bags t
Electronics Forum | Tue Sep 20 09:07:23 EDT 2016 | davef
5 Common Causes of Bubbles in Conformal Coating (and Their Remedies)[Diamond-MT's Blog]
Electronics Forum | Fri Jan 16 06:53:33 EST 2009 | stevewilde
I am using Humiseal 1B31 conformal coating and xylene mix on a PVA coating machine. Bubbles are appearing between the pins of LCCs mainly and bubbling is worse when put through the IR oven. Does anyone have any suggestions or tips to elliminate this
Electronics Forum | Thu Nov 19 05:18:37 EST 2009 | prodivegsr
Hi All, Recently we are working on the conformal coating process using Humiseal chemical 1B73 and thinner 521. Bubbles on component body/joints are seen after gone through the IR Reflow Oven. During the conformal coating, only tiny bubbles seen af
Electronics Forum | Sun Nov 22 18:40:47 EST 2009 | 89jeong
Hi The bubble shows only around component body after ir reflow. I think bubble means that there is a moisture. How do you dry the PCB(?) before IR reflow? Thanks Ju-young.
Electronics Forum | Sun Nov 22 19:53:10 EST 2009 | prodrivegsr
Hi Ju Yong, The PCB are dry in an airseal cabinet(Staging Chamber) before IR Oven. The bubbles show at around body and solder joint area. You mean the moisture will create bubbles ? Able to advice the humidity and temperature that you are using in
Electronics Forum | Mon Jun 24 22:39:25 EDT 2019 | sssamw
yes, the void should not expose the conductor or bridge the conductor, the coating there should be thick as IPC required but you need minimize the voids and bubbles. ALso for those small chips, a void or bubble on it means possible ECM, normlly shou
Electronics Forum | Wed Nov 19 18:43:04 EST 2014 | gregcr
Hi All, I've been in the CM world for a long time and it seems like there has been little change in the packaging techniques used at the end of the day. Assembled circuit boards in small/flex volume are bagged or bubble wrapped and boxed up to ship
Electronics Forum | Sun Nov 22 19:59:26 EST 2009 | prodivegsr
Hi Davef, The bubbles occurs at the body also...there's also a washing process before the conformal coating:-the Flux residue are removed after washing. ... The curing profile is also something that we are looking into during the initial troubles
Electronics Forum | Thu Sep 15 15:27:50 EDT 2016 | rvines1
Has anybody else had issues with shipping circuit boards in static shield bubble bags? It appears that parts are getting ripped off during shipping. I suspect that they're getting caught in the bubbles when the boards shift in the bags as the boxes
