Rich

This is good. What do you use as a test coupon?

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


On Fri, Jun 26, 2020 at 4:58 PM Richard Kraszewski <
[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]] On Behalf Of GRIVON Arnaud
> Sent: Friday, June 26, 2020 7:29 AM
> To: [log in to unmask]
> Subject: [TN] [COM] Conformal Coating Adhesion Test Protocol Details |
> Acrylics & Silicone Coatings
>
> [EXTERNAL] This email was sent from outside of Plexus.  Use caution when
> opening attachments or links from unknown senders.
> .
> 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
>