Tan,
Most of your coating adhesion tests will trace its roots back to
ASTM-D-3359, which has a good experimental procedure on how to do the
scoring.  You can either score the coating to make a checkerboard pattern
of multiple squares, or score in an X pattern and look at adhesion at the
intersection of the score marks.

As to the relation of before or  after thermal shock, it depends on what
you want to learn.  If you want to learn if Parylene coating sticks better
or worse after thermal shock, then do the test after thermal shock. If you
are doing simple materials property testing, then do it before.


Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins

On Thu, Feb 12, 2015 at 7:46 PM, Tan Geok Ang <[log in to unmask]> wrote:

> Any comment or advice?
>
> ________________________________________
> From: TechNet [[log in to unmask]] on behalf of Tan Geok Ang [
> [log in to unmask]]
> Sent: Thursday, 12 February, 2015 5:42:25 PM
> To: [log in to unmask]
> Subject: [TN] Adhesion, Polymer Coating ( IPC-TM-650 2.4.16 )
>
> Will like to check whether it is a common practice  to subject parylene
> coated boards to thermal shock cycles before performing adhesion test
> method in accordance to IPC-TM-650 2.4.16 (similar to ASTM 3955)?
>
> At the same time, Section 4.0 (Apparatus or Material) of IPC-TM-650
> 2.4.16, does not indicated what tool is used to create the pattern under
> section 5.2 (though it refer to IPC-DD-135 which is an obsoleted standard)
> as the line width of the pattern is 0.1mm. Razor blade thickness is about
> 0.2mm.
>
> Hope to get advice you all.
>
>
>
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