Thank you all on the advice and comment.

I am testing it on PCBA. Do anyone/ your customers did a peel test base on ASTM-D-3359 after thermal shock cycles? I did and it "failed" (only meet 3B of the rating).

I believe I will need to work harder if someone did and passed the test. Thanks.

________________________________
From: lduso - Diamond-MT.com [[log in to unmask]]
Sent: Friday, 13 February, 2015 9:36:31 PM
To: TechNet E-Mail Forum; Tan Geok Ang
Subject: Re: [TN] Adhesion, Polymer Coating ( IPC-TM-650 2.4.16 )

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<http://www.Diamond-mt.com>

On Thu, Feb 12, 2015 at 8:46 PM, Tan Geok Ang <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Any comment or advice?

________________________________________
From: TechNet [[log in to unmask]<mailto:[log in to unmask]>] on behalf of Tan Geok Ang [[log in to unmask]<mailto:[log in to unmask]>]
Sent: Thursday, 12 February, 2015 5:42:25 PM
To: [log in to unmask]<mailto:[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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