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'[PICLIST] [OT] What is Silicone Conformal Coating?'
2001\04\20@181810 by John Waters

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Hi All,

I saw in the electronic component store a kind of chemical called "Silicone
Conformal Coating", is it used for providing a layer of protective coating
covering up the PCB? If so, will high frequency signal(say, up to 12
MHz)leak through this kind of coating?

Thanks in advance!

John



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2001\04\20@195541 by David VanHorn

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At 06:18 PM 4/20/01 -0400, John Waters wrote:
>Hi All,
>
>I saw in the electronic component store a kind of chemical called "Silicone
>Conformal Coating", is it used for providing a layer of protective coating
>covering up the PCB? If so, will high frequency signal(say, up to 12
>MHz)leak through this kind of coating?

Radiated RF will fly right through it at any frequency. It's transparent to RF.



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2001\04\21@022724 by Peter Tiang

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I think you need metallic/conductive coating to
shield RF. Silicon will pass RF thru.

There are newer plastic material with metallic
anodizing that can shield RF and gaining popularity
in its use as casing.

Rgds,
Peter Tiang.

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