Electronics Forum | Mon Nov 06 10:51:23 EST 2006 | SteveH
We have 2 PVA2400 4 axis selective spray machines that we use to spray Humiseal 1B31 and 1A33. They take a bit of programming to get right, though this is easy to do, but do the job OK. Another to consider if you need the 4 axis of movement would b
Electronics Forum | Thu Jan 22 03:25:26 EST 2009 | stevewilde
What masking tape can people recommend for masking the board when conformal coating. I am using a PVA autocoat machine and humiseal 1B31. Current tape, is leaving residue on board when used to hold link wires down whilst glue cures and also when used
Electronics Forum | Thu May 31 15:00:33 EDT 2012 | jdumont
I use Trace Labs and certainly recommend them. I actually just had this test done last week. Adhesion test per ASTM-3359 Method B. We also use Humiseal 1B73, which is similar to the 1B31 you use. Is your soldermask "active" enough for this coat
Electronics Forum | Wed Oct 17 02:04:39 EDT 2018 | robl
SCC3 has an operating temperature of 200C, as long as it is heat cured at 100C. https://www.electrolube.com/pdf/tds/044/DCA.pdf It's also a silicone so needs to be coated & cured away from anything you value. Otherwise there are plenty of PU's and
Electronics Forum | Thu Feb 25 07:37:42 EST 2010 | pcbrown
We are using Humiseal 1B31 and polyester dots for masking. We are spraying this in a Binks sprayer mixed at almost 1:1 with 521 thinner. Whe are seeing the coating creating thin halos around the poly dots as if the dots are "rejecting" the coating. T
Electronics Forum | Fri Dec 18 09:07:24 EST 2009 | tommyg_fla
dave, where I work they are having the same problems with 1B31 acrylic. The coating thickness is 6-8 mils dried so that have to do several passes with an air dry between them and a final oven cure. They think that it might be related to the heating r
Electronics Forum | Mon Jan 19 09:10:17 EST 2009 | stevewilde
Thank you for all of the advice. I am using the extended spray for these cards. Humiseal have recommended using their own thinners 600 instead, so will run some trials with this and also the humiseal pre-mixed material (at the moment we mix our ow
Electronics Forum | Wed Mar 24 15:04:05 EST 1999 | Greg Curler
I am looking into replacing another business division's Acrylic coating process with our Urethane coating process. Unfortunately, MIL-I-46068 doesn't differentiate AR/UR's performance, and the MFR data sheets don't match up at all (they each spec di
Electronics Forum | Wed Mar 24 21:40:05 EST 1999 | Dave F
| I am looking into replacing another business division's Acrylic coating process with our Urethane coating process. Unfortunately, MIL-I-46068 doesn't differentiate AR/UR's performance, and the MFR data sheets don't match up at all (they each spec
Electronics Forum | Fri May 18 06:49:58 EDT 2012 | kahrpr
We us a lot of 1B31 it could be one of the most common coatings out there. We do not clean the boards and do not have an issue. I would check the solder mask compatibly. I would also see how the 3rd party company is testing the boards what criteria o
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