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October 2004

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Subject:
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, David Douthit <[log in to unmask]>
Date:
Wed, 27 Oct 2004 05:30:51 -0700
Content-Type:
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text/plain (136 lines)
Graham,

Good point!!!

David A. Douthit
Manager
LoCan LLC

Graham Naisbitt wrote:

>James
>
>Taking-up the thread of this issue and noting the comments made by others, I
>don't care what type of coating is used, 1 or 2 part urethanes or whatever,
>this process should NOT be done as it will unquestionably affect the
>intended performance of the coating long-term and to an indeterminate
>extent.
>
>A conformal coating is used to help protect circuits long-term against
>hostile environmental conditions. It is not designed to resist various
>chemical cleaning processes submerged, and presumably at a temperature above
>ambient, for undefined periods of time. Using ultrasonics makes matters
>worse. If the coating has become even partially saturated, then the
>cavitation will surely further weaken the coating.
>
>No coating is impervious.
>
>My initial reaction is that the user of this device should complete the
>cleaning process and then apply the coating.
>
>Suggesting a cleaning process that will not affect the integrity of the
>coating nor the device itself is tough. I know of customers who do clean
>coated devices, but this would require input from them - Doug Pauls maybe??
>
>I hope this helps you
>--
>Regards Graham Naisbitt
>
>[log in to unmask]
>
>Concoat Limited - Engineering Reliability in Electronics
>A British Manufacturer
>
>NEW WEB SITE: www.concoat.co.uk :NEW WEB SITE
>
>Golf Quote of the week: The Royal Hong Kong Golf Club caddies hit the nail
>on the head; their term for golf: "Hittee ball, say damn."
>
>Cell: 079 6858 2121
>Office: +44 (0)1252 813706
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>
>
>
>>From: James TerVeen <[log in to unmask]>
>>Reply-To: TechNet E-Mail Forum <[log in to unmask]>, James TerVeen
>><[log in to unmask]>
>>Date: Mon, 25 Oct 2004 13:39:22 -0400
>>To: <[log in to unmask]>
>>Subject: [TN] conformal coating
>>
>>I am looking for a conformal coating that can withstand the use of a
>>cleaner (Lixton TS-974)
>>We have a customer who uses our parts that are coated with Humiseal 1A33
>>and is cleaning them in an ultrasonic cleaner that has Lixton TS-974 in it.
>>They are complaining that the coating is coming off.  With the ingredients
>>I see below there is no wonder.   So my first question was, is there a
>>conformal coating that will withstand this material or if not is there a
>>better cleaner I could recommend that will not remove the humiseal.
>>Remember it has to go into an ultrasonic cleaner.
>>
>>Thank in advance.
>>
>>
>>The ingredients are in this material are:
>>LIXTON
>>
>>50 - 10%    4-Hydroxy-4-methyl-pentan-2-0n
>>2.5 - 10%   N-methyl-2-pyrrolidome
>>2.5%           Alkylaminethoxylat
>>2.5%           modifiziertes Fettalkoholetethoxylat
>>
>>
>>
>>
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