Polished steel Qpanel from Q-labs.
Rich Kraszewski /Plexus
Senior Staff Process Engineer
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From: lduso - Diamond-MT.com [mailto:[log in to unmask]]
Sent: Friday, June 26, 2020 4:03 PM
To: TechNet E-Mail Forum <[log in to unmask]>; Richard Kraszewski <[log in to unmask]>
Subject: Re: [TN] [COM] Conformal Coating Adhesion Test Protocol Details | Acrylics & Silicone Coatings
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Rich
This is good. What do you use as a test coupon?
Lloyd Duso
General Manager
Diamond-MT
(814) 535-3505
https://ddei3-0-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=www.Diamond%2dmt.com&umid=E563B0DF-A903-0A05-BB94-4C0442595C5B&auth=a79cf964896a44925c32628edeb2301b3739bcef-768f8ee839f4308af6ba3cd76a89aa63daed63ad<https://ddei3-0-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.Diamond%2dmt.com&umid=E563B0DF-A903-0A05-BB94-4C0442595C5B&auth=a79cf964896a44925c32628edeb2301b3739bcef-02a54c43faffbccd71e7b4895ba52d214085737f>
On Fri, Jun 26, 2020 at 4:58 PM Richard Kraszewski <[log in to unmask]<mailto:[log in to unmask]>> wrote:
We have customers that require this test to be performed on the coatings that we apply to their assemblies .
Internally we require all coatings materials we use to be tested to the IPC test method prior to use on any product.
As a result, we roll that requirement down to the coating manufacturers through our distributors. They only ship us lots that pass our requirement.
The test itself is not perfect and can be somewhat subjective.
I consider it be more "qualitative" in nature, rather than quantitative. Able to identify and prevent "really bad" coating batches from being accepted and used.
Therefore we keep the acceptance level on the low side
Rich Kraszewski
Plexus
Senior Staff Process Engineer
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]<mailto:[log in to unmask]>] On Behalf Of GRIVON Arnaud
Sent: Friday, June 26, 2020 7:29 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: [TN] [COM] Conformal Coating Adhesion Test Protocol Details | Acrylics & Silicone Coatings
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Hi TechNet,
I know that, contrarily to PCB solder mask adhesion tests, adhesion tests for conformal coatings are not standardized or covered by shared/uniform practices.
Without willing to open a new can of worms, I would be interested by the detailed adhesion test protocol/methodologies from those who are successfully performing this kind of test in qualification and/or production.
For both acrylics and silicone conformal coatings, say 1B73 for acrylics and 1-2577 or RTV-3140 for silicones if coating references can help driving responses.
Questions in particular :
- What reference standards are used for the adhesion test methodology (e.g. IPC-TM-650 - method 2.4.28 for the tape test) ?
- What types and references of tapes ? This may differ between the two considered kinds of coatings.
- For adhesion tests with cross-hatching : tools and blade spacings (1mm vs. 2mm) specified
- Acceptance criteria with the related reference standard (e.g. : grade xx as per EN ISO 2409 or ASTM D3359)
Thanks in advance for your inputs.
Have a nice week-end.
Arnaud Grivon
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