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Date: | 22 Nov 96 08:15:11 -0500 |
Content-Type: | text/plain |
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I use silicone coatings. We cannot use the tape test, since no
adhesive tape that we have found sticks to the silicone. All tape
tests failed between the tape and coating.
We have used alternate methods. We used wet 3-1753 (or 1765) as an
adhesive between the coating and a substrate used for pull tests.
In every test, the failure mechanism was cohesive, within the coating.
The only problems where adhesive failure occurred was with one vendor
who was shipping "dirty" boards.
Aric Parr
[log in to unmask]
______________________________ Reply Separator _________________________________
Subject: RE: Conformal Coating Adhesion Testing
Author: [log in to unmask] at internet
Date: 11/22/96 1:09 AM
I recommend that you read through ASTM D3359 "Methods for Measuring
Adhesion by Tape Test" and a recent CRADA report "Evaluation of
Low-Residue Soldering for Military and Commercial Applications: A Report
from the Low-Residue Soldering Task Force".
The CRADA study included coating adhesion evaluation using ASTM D3359 like
tape adhesion tests on MIL-I-46058C coupons. There is a good description
of the test, the sample conditioning and some of the pitfalls of the test.
Experience is needed to get consistent cut and peel-by-tape testing.
Every cut has to be made with a good sharp blade. An experienced
operator examines his blade often under magnification and replaces it at
the first sign of wear. Also, he/she is able to apply consistent
pressure on each cut.
Mary Davis
Sr. Material & Process Engineer
Alliant Techsystems
206-356-3311
[log in to unmask]
----------
From: Yuen, Mike[SMTP:[log in to unmask]]
Sent: Thursday, November 21, 1996 7:04 PM
To: [log in to unmask]
Subject: ASY: Conformal Coating Adhesion Testing
I need any information of how to test the adhesion of silicone conformal
coatings. I have heard about performing tape tests, but I would like
more
information. Currently, we are using Dow Corning 1-2577 and 3-1765. Any
help would be appreciated.
Heather Benedict
Process Engineer
414-751-5490
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