Steve,

Curious that you have shortlisted Acrylic AR and Paraxylylene XY. On what
basis?

As XY is applied by vapour deposition in a vacuum chamber, it follows that
it is being applied and cured correctly. If you apply and cure the AR
correctly, which is not always the case, then you should get comparable
results.

The difference? AR provides easier repairability, less sophisticated
application and does not fall off if applied over "no-clean". (Now that
should create something of a stir!)

Regards, Graham Naisbitt

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Concoat Ltd             Phone: +44 1276 691100
Alasan House          Fax:      +44 1276 691227
Albany Park
CAMBERLEY
GU15 2PL UK
-----Original Message-----
From: Lustig, Steven K.. <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 09 April 1999 00:01
Subject: [TN] selecting coatings


>TechNetters,
>
>I am working on selecting a coating for a PCB assembly, and am focusing
>on an acrylic and parylene.  What factors should I consider and which
>coating is better for those particular factors?  Also, if I do choose
>parylene, what should be the basis for my decision on how thick a
>coating I should specify?
>
>Thanks for the help.
>
>-Steve
>
>Steven K. Lustig
>Process Engineer
>EMS Technologies, Inc.
>Norcross, GA
>(770) 263-9200 x4714
>[log in to unmask]
>
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