Electronics Forum | Wed Aug 13 21:03:01 EDT 2003 | davef
Your dust collection / humidity / ionic path concern is reasonable. Consider applying your conformal material thick enough to form a good barrier between the device edge and the board, similar to what you do for QFP. [Admittedly the QFP is not a pre
Electronics Forum | Mon Jul 23 11:44:40 EDT 2007 | davef
NASA-STD-8739.1, 10.2.3 Thickness Measurements. Thickness measurements shall be made on coupons processed at the same time and under the same conditions as the PWA. The coupon substrate may be any compatible rigid material with a smooth flat surface.
Electronics Forum | Thu Aug 13 19:30:57 EDT 2009 | secura1
I'm new to all this... we have a board with one BGA blue tooth device. one test for the board is an rf test that measure successful packet transmission. we find that we get much lower error rates if we "reflow" the BGA with a heatgun. We do this
Electronics Forum | Mon Jul 13 11:21:52 EDT 2020 | dontfeedphils
1) Viscosity measurement of the coating prior to spray, spraying and charting metal coupons for sprayed and cured thickness of the coating at various points of the conformal coat run 2) Yes, manual inspection 3) No, it wasn't able to inspect with t
Electronics Forum | Mon Sep 21 20:45:55 EDT 2009 | davef
10.4. Pre-Cure Examination. Immediately after material application, the uncured conformal coating shall be examined for: a. Bubbles and Air Entrapments. These defects shall be broken by vacuum, with a sharp probe, or other appropriate tools. b. Bridg
Electronics Forum | Wed Nov 20 16:47:10 EST 2013 | aaronpavone
I have a right angle male shrouded connector and the whole set of termination leads is tin lead plated, at least 100 microinches thick. Should the entirety of the lead be conformal coated? Or can we have just the joint coated? I know I have coated le
Electronics Forum | Thu Oct 06 10:57:52 EDT 2005 | SuMoTe
Put a known thickness gage next to your boards to be coated. Then coat it in the same pass as your boards. Measure the "new" thickness of your gage and subtract the difference. That will be your coating thickness. This is assuming your coating your o
Electronics Forum | Sat Jun 12 03:51:17 EDT 2004 | Andy Wong
Hi, Can this machine control the coated thickness very tight and good repeatability. Thanks.
Electronics Forum | Wed Dec 01 15:53:59 EST 2004 | davef
uV light inspection indicates the "completeness" of coverage, but provides no measurement of coating thickness.
Electronics Forum | Wed Mar 02 07:47:57 EST 2016 | deanm
Sounds like over molding would be ideal, but if they don't want to spend for a mold I would look at silicone conformal coatings that can be used in a dip process. Silicones are thicker than other coating materials and multiple drippings may provide t
