SEM/EDX analysis for silicone is not sensitive enough, especially
when use high kV, the sampling depth is way under the surface you are
interested. besides, it is elemental analysis, not conclusively
tell you it is silicon or silica or silicone... IMHO.
jk
On Jan 8, 2020, at 10:46 AM, Richard Kraszewski wrote:
> So Grivon I have been in your position with an auditor as well on
> this same topic.
>
> While FTIR is a great tool to detect the presence of silicone
> compounds (if you actually have one - unlike me who very jealously
> wishes we did), you can also use a functional test such as a
> solder spread copper/brass coupon to show that even if silicon
> is present, it has a negligible if any impact on solderability.
> IPC TM 650 has a method.
>
> The downside of using only chemical analytical instrumental is
> that now it is so sensitive that you can detect trace levels on &
> of almost anything. Issue is trying to define (correlate)a level
> at which you need to have concern. Hence adding a functional test
> such a solder spread can provide additional supporting evidence and
> value.
>
> In our case, we used both SEM/EDX and solder spread tests to avoid
> a potential audit finding at one of our sites.
>
> Every auditor is different.
> Good luck!!
>
> Rich Kraszewski
> Senior Staff Process Engineer
> Plexus
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of GRIVON Arnaud
> Sent: Tuesday, January 7, 2020 8:00 AM
> To: [log in to unmask]
> Subject: [TN] [COM] Evaluating/Monitoring Silicone Contamination
>
> [EXTERNAL] This email was sent from outside of Plexus. Use caution
> when opening attachments or links from unknown senders.
> .
> Happy New Year TechNet !
>
> Here is a first query for 2020...
>
> We all know about the need of carefully segregate acrylic/urethane
> from silicone conformal coatings, but how about evidencing and
> demonstrating (say for an angry auditor) the actual lack of
> silicone cross-contamination on toolings, ovens and workspaces ?
>
> Are you aware of any reliable test system to perform silicone
> contamination evaluations? What are their principles and related
> test methods & acceptance criteria?
>
> It looks like some suppliers offer Surface Silicone Contamination
> Test Kits :
>
> - Henniker Plasma<https://ddei3-0-ctp.trendmicro.com:443/
> wis/clicktime/v1/query?url=https%3a%2f%2fplasmatreatment.co.uk%2fwp%
> 2dcontent%2fuploads%2f2016%2f09%2fHenniker%2dPlasma%2dTechnology%
> 2dOverview.pdf&umid=5D81E98C-9B8D-3105-
> A422-6CBEC76778FA&auth=fa0282dc3c44b189bcc708f19c936975d8469bfe-165e1d
> 080a0a9e9f188777d6b054340861c5087c> : https://ddei3-0-
> ctp.trendmicro.com:443/wis/clicktime/v1/query?url=https%3a%2f%
> 2fplasmatreatment.co.uk%2fhenniker%2dplasma%2dtechnology%2fproducts%
> 2fsurface%2dtest%2dequipment%2ftest%2dfor%2dsurface%2dsilicone%
> 2dcontamination%2f&umid=5D81E98C-9B8D-3105-
> A422-6CBEC76778FA&auth=fa0282dc3c44b189bcc708f19c936975d8469bfe-99a2c6
> 33c2b699940a1b64811a5d44fb38a31589
>
> - Anderson Materials Evaluation : http://
> www.andersonmaterials.com/test_methods/testing-facilities-for-
> silicone-contamination.html#<http://www.andersonmaterials.com/
> test_methods/testing-facilities-for-silicone-contamination.html>
>
> Any practice of such test kits and return of experience to share?
>
> Thanks in advance for your feedbacks.
>
> Best regards,
>
> Arnaud Grivon
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