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Date: | Thu, 8 Feb 2018 10:06:54 +0700 |
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A few solutions we have been offering are to
* Pre-coat critical components in a hydrophobic coating before actual
assembly
* Pre-apply a hydrophobic coating around the connectors before
application.
* Apply the hydrophobic coating to masking boots
This gives the components or masking some ability to "reject" the
conformal coating being applied due to the change in surface tension and
certainly can reduce incidence of capillary. Contact me offline for more
details.
Best Regards
Dr Lee Hitchens
Please be aware that I am personally based in Thailand and travel frequently due to business.
If I am unavailable you can also contact my offices directly in the UK, USA and India for support.
Mob: +66 95 418 5931
Skype: leehitchens
UK: +44 1226 249 019
India: +91 900 038 3674
USA: +1 206 257 9787
www.conformalcoating.co.uk
SCH Technologies is a Division of SCH Services Limited
On 08/02/2018 10:01, Richard Kraszewski wrote:
> Yup Real common for unsealed connectors.
>
> You either have to find a better masking solution (often not possible) and/ or use multiple layers of a highly atomized (dry ) spray that is not very mobile when it hits the PCBA.
>
> Some unsealed ZIF connector styles where the requirement is coat the leads but contacts are all KOZ are really a problem for me due to capillary action of the coating if still wet when it hits the PCBA.
>
>
>
> Rich Kraszewski
> Senior Staff Process Engineer
> Plexus Engineering Solutions
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>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Wednesday, February 07, 2018 4:17 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC-CC-830 (Conformal Coat)
>
> sorry for the long delay (and thank you for the responses) but as I was reviewing these posts I had another question:
>
> Have you ever heard of problems with conformal coating material wicking up the connector leads and causing intermittent connections?
>
> thanks again,
> Jack
>
>
> On Wed, 6 Dec 2017 14:09:46 -0500, lduso - Diamond-MT.com <[log in to unmask]> wrote:
>
> (..snip...)
>> It's up to me to decide how close to J1 to get with the coating. I once
>> coated the leads of all the fine-pitch connectors and the customer said
>> that was too close. The next customer will reject the work if I don't
>> coat the leads.
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