Hallelujah!

Nobody believes me when I tell them this Brian! We have seem this time and
again with customers specifying a silicone because they want a 'more
waterproof' coating. They always end up using so much more material to get
the same performance.

Alan Brewin.
Concoat Ltd.

-----Original Message-----
From: Brian Ellis <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 21 May 2000 10:26
Subject: Re: [TN] Silicone Confromal Coating


>Ken
>
>Just remember that silicone coatings are generally 2-10 times faster in
>passing osmotic humidity for a given thickness than acrylic (best),
>epoxy or polurethane, so the final protection against vesication is
>considerably inferior, especially if it is a type that does not require
>a special (aggressive) primer to ensure adhesion. Many think that,
>because silicone coatings are water-repellent, they are also
>moisture-repellent. Nothing is farther from the truth.
>
>Brian
>
>Ken Bloomquist wrote:
>>
>> Hi TechNet,
>>
>> We have a customer that wants us to spray Silicone confromal coating on
>> their boards. We currently spray polyurethane and acrylic.
>>
>> My question is: Is there any problem adding Silicone to our process? What
>> art the things we need to consider in adding this process?
>>
>> Thanks,
>>
>> Ken Bloomquist
>>
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>--
>Brian Ellis
>Protonique SA
>PO Box 78
>CH-1032 Romanel-sur-Lausanne, Switzerland
>Voice: +41 21-648 23 34 Fax: +41 21-648 24 11
>E-mail: [log in to unmask]
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>       http://www.protonique.com
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>
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