Tan

Mr Pauls follows the same method as we do. We apply Parylene as a service
and if adhesion testing is requested by the customer, the D3359 is usually
the spec called for unless they generate their own. We have purchased a
specific test kit with the proper size blades just for this. The only
caution is that the substrate you use as a test coupon must be the exact
same substrate material of what you want the parylene to have max adhesion.
In other words, if you are coating a CCA, don't use a glass slide as a
coupon. All you are doing is testing parylene adhesion to glass, not solder
joints or device leads. Parylene will adhere to each differently.

Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com

On Thu, Feb 12, 2015 at 8:46 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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