At last Falls IPC Cleaning Symposium in Rosemont, IL  Lamar Young / SCS
presented a paper where he wasn't using tape, but rather lifting the
squares with a needle and assessing the adhesion using a Likert scale.
He claimed the results were more consistent than tape.  I think that the
testing for that presentation was actually done on parylene.

You should be able to find the proceedings somewhere in IPC. 


Rich Kraszewski / PLEXUS


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mary Lou Sachenik
Sent: Saturday, May 09, 2009 6:48 AM
To: [log in to unmask]
Subject: [TN] Parylene Adhesion Tape Test

We recently had some issues with lack of adhesion of Parylene coating

What types of notes are being used on drawings to define parylene
conformal coating adhesion test on pwa's?
Is the ASTM3359-08 (for assessing the adhesion of coating films to
metallic substrates) the best spec to call out for this testing .
I presently don't have pwb coupons to perform destructive cross hatch
test.

What type of tape is being used testing parylene adhesion on the PWA's? 
Some specs call out 3M-250 tape, the ASTM D 3359 calls out the Permacel
99.
Actually I prefer the Wescorp 79210 clear Anti-static Tape, does this
seem acceptable?

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