Jon

I would direct you at some new water based coatings. We have an acrylic
water based coating able to go beyond 200DegC - more than enough for your
average electronic assembly. Bearing in mind that eutectic is 183Deg, I
can't see the need for more.

I certainly cannot add any more to Brian's explanation about silicones.
Frankly, I cannot see any benefits and don't forget Brian's earlier point
about the CTE of silicones with BGA COB Flip-Chip etc..

...and before anyone has a go, we have ALL the different types in our
portfolio, so we only recommend the best for a given application.

Regards, Graham Naisbitt

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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Jon Moore
> Sent: Friday, June 15, 2001 04:16
> To: [log in to unmask]
> Subject: Re: [TN] Silicon Conformal Coatings
>
>
> Silicones are able to withstand a much higher temperature range than
> acrylics.  You are right in your point that they will retain
> moisture, so if
> the temperatures are not too extreme and moisture is the primary problem,
> then I would recommend acrylic or urethane.  Silicones are also
> preferred in
> situations where a thick coating build up is called for due to dielectric
> need.  Acrylics tend to micro-crack easily if applied too thick.
>
> Jon Moore
>
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