Electronics Forum: bubbles (Page 1 of 24)

Conformal coating bubbles with 1B73

Electronics Forum | Fri Feb 18 08:08:55 EST 2011 | floydf

I have found that depressurizing the tanks when the machine is not in use reduces bubbles.

Conformal coating bubbles with 1B73

Electronics Forum | Tue Mar 01 15:07:00 EST 2011 | dennisfo

Update on 1B73 bubbles, Changed over to a mixture of Humiseal 73 thinner with coating (25 sec on Zahn 2) observed a reduction in bubble formation (approx. 20%) but still present.

Conformal Coat (Urethane) & bubbles

Electronics Forum | Tue Jan 24 10:24:18 EST 2006 | kmorris

We've got a problem here, where we're hand spraying a urethane conformal coat on over a rectangular inductor. The inductor body is a plastic tube, with potting to fill. The top is not always flat (sometimes concave). The problem is that bubbles appea

Conformal coating bubbles with 1B73

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....

Conformal coating bubbles with 1B73

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

Conformal Coat (Urethane) & bubbles

Electronics Forum | Tue Jan 24 12:29:45 EST 2006 | patrickbruneel

Contact Graham Naisbitt he is an expert in this field. Graham.Naisbitt@concoat.co.uk

Conformal Coat (Urethane) & bubbles

Electronics Forum | Tue Jan 24 21:07:17 EST 2006 | davef

We all genuflect to Graham Naisbitt, a generous contributor to SMTnet. Moisture-curing urethanes may form minute bubbles if the coating is too thick or the coating environment is too humid. So, tell us more about your urethane and the method you u

Conformal coating bubbles with 1B73

Electronics Forum | Fri Feb 18 12:00:08 EST 2011 | dennisfo

That has also been the standard here. We have a urethane line which pulls a vacuum on the mixture before transfering to the can. I plan on testing this out before receipt of the 73 thinner. I've also received some feedback with indication that the mi

Conformal Coat (Urethane) & bubbles

Electronics Forum | Tue Jan 24 19:00:15 EST 2006 | MikeF

Graham Naisbitt is definitely an expert on conformal coating, he has posted answers here for years. Check your material to see what the cure mechanism is. Most urethanes need moisture from the air to cure, the higher the relative humidity the faste

Conformal coating bubbles with 1B73

Electronics Forum | Wed Feb 16 12:47:58 EST 2011 | dennisfo

I've been here approx. 3 months. It was indicated that Xylene has alwas been used but it was never indicated that bubbles were not present in the past (ignored or touchup). I have a sample of Humiseal 73 thinner ordered for testing. We've been thinne

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