sci.physics.electromag

Thank for the reply.

I found Y-SHIELD
http://www.lessemf.com/paint.html
which looks like a usable solution.

The plan is to paint my office with it
so the guitar paint is a little too expensive.


Benj wrote:
> On Jan 31, 1:37 am, Knud Soerensen <4tuu4k...@sneakemail.com> wrote:
>> Hi
>> I have read about em blocking paint.
>
> Depends what you mean by "EM blocking". One would be shielding paint
> (as found painted in wooden guitar cavities to shield from hum and
> noise) and the other would be EM absorbing paint (as found on black
> helicopters to make them "invisible" to radar).
>
>> But who makes it and where do you buy it ??
>
> The conductive paint for shielding is available from guitar parts
> suppliers on the Internet. The EM absorbing paint is probably also
> available if you search around. Look for supplies for EM anechoic
> measurements.
>
>> Is possible to make yourself by mixing metal powder in ordinary paint ?
>
> I suppose it's possible to make either type. The shield paint is just
> metal powder (silver) or other conductive powder (carbon = aquadag) in
> some kind of base. The tricky part is to have the particles touch each
> other to make a conductive sheet when the paint dries. Absorbing
> paint is similar only you mix in things like carbon particles to
> absorb the EM and in this case (where reflections are undesirable) you
> have to adjust the impedance of the paint to maximize the dissipation
> of the incident radiation. Thus, the paint probably needs to be
> optimized for frequency. I think this stuff is around for painting EM
> test rooms as well as the traditional pyramid carbon-impregnated
> foam.
>
> I once tried to make conductive paint by just adding powdered silver
> to Krylon clear plastic spray "paint". It didn't work! When the paint
> dried the particles were isolated from each other and sheet of silver
> paint was NOT conductive!
>
> OK?
>


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