Chris

First you should be aware that the soon to be released revision of the
IPC-CC-830 will EXCLUDE adhesion testing.

Why? Because there seems to be no correlation between adhesion of the
Conformal coating with circuit reliability. Remember that the coating is
tested independently onto bare coupons (as are all other surface coatings:
resists, fluxes pastes etc) and adhesion in this condition  has not seemed
to be an issue.

However, when you put a resist in between and adhesion sometimes seems
poor? - The coating is not intelligent - so how does it know any
difference??

Also, are you using a silicone coating? If so, how is any tape (used in such
adhesion tests in the past) going to stick to the coating to make the test
meaningful?

Have you experienced a reliability problem? Are you testing the coating for
failure? Please advise....

Regards, Graham Naisbitt
__________________________________________________________________________

[log in to unmask]

Concoat Ltd
Alasan House, Albany Park
Camberley GU15 2PL UK                        http://www.concoat.co.uk

-----Original Message-----
From: Chris_Smith <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 12 February 1998 19:59
Subject: [TN] Conformal Coat adhesion testing?


>     All,
>       I am currently seeking a place to purchase a roll of mesh to do
>     conformal coat adhesion testing with.  What I've found so far is that
>     it should have 1/8 inch squares and should be an 1in wide.  It will be
>     made of a fiberglass, Holland cloth or a Dacron cloth material.  If
>     anyone has any other information or areas I could look please let me
>     know.
>
>     Thank you
>     Chris Smith
>     Manufacturing Eng.
>
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