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March 2007

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Subject:
From:
"Douglas O. Pauls" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 9 Mar 2007 08:25:09 -0600
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We take masking off after the coating has come to a tack free state, but
before cure.  That way we can touch up any coating that comes up prior to
cure.    I suspect that the coating is getting under the spray fixtures and
the cured coating adheres it in place.

Doug Pauls



                                                                           
             Jeff Smith                                                    
             <jeffs@PENTAGON-E                                             
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             03/08/2007 02:10          [TN] CC fixture issue               
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                Jeff Smith                                                 
             <jeffs@PENTAGON-E                                             
                  MS.COM>                                                  
                                                                           
                                                                           




We have a customer using a masking fixture for their conformal coating
process.  They're running into an issue with the cover adhering to the
board
after curing.  The fixture is made from 6061 Aluminum, and the coatings
being
used are:

Arathane 5750 A/B with a Cellosolve acetate Thinner
Aptek 2512
Humiseal 1B31 with Humiseal 521 Thinner

We make thousands of these fixtures a year and haven't run into this
problem.  We're exploring possible solutions, so I thought I'd post a
couple of
questions:

1) Does the board need to remain in the fixture until fully cured?
2) is there an issue with these specific coatings?

Thanks!

Jeff Smith
[log in to unmask]

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