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Science Forum Index » Physics - Electromagnetic Forum » em blocking paint
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| Knud Soerensen |
 Posted: Thu Jan 31, 2008 1:21 am |
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Hi
I have read about em blocking paint.
But who makes it and where do you buy it ??
Is possible to make yourself by mixing metal powder in ordinary paint ? |
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| Guest |
| Posted: Thu Jan 31, 2008 3:15 am |
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Knud Soerensen <4tuu4k002@sneakemail.com> wrote:
Quote: Hi
I have read about em blocking paint.
But who makes it and where do you buy it ??
Is possible to make yourself by mixing metal powder in ordinary paint ?
Do you mean EM absorbing paint?
Just about any metallic paint is EM blocking to one degree or another
as is aluminum foil.
--
Jim Pennino
Remove .spam.sux to reply. |
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| Benj |
| Posted: Fri Feb 01, 2008 9:59 am |
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On Jan 31, 1:37 am, Knud Soerensen <4tuu4k...@sneakemail.com> wrote:
Quote: 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).
Quote: 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.
Quote: 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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| Knud Soerensen |
| Posted: Fri Feb 15, 2008 9:45 am |
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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:
Quote: 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?
--
Test din kandidat http://xn--krlighedsfolket-xlb.dk/spoergsmaal/ |
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| Benj |
| Posted: Fri Feb 15, 2008 5:05 pm |
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Guest
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On Feb 15, 8:45 am, Knud Soerensen <4tuu4k...@sneakemail.com> wrote:
Quote: Thank for the reply.
I found Y-SHIELDhttp://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.
I'm sure guitar paint is expensive because of the small quantities.
Even that paint isn't exactly cheap! Interesting stuff though. It's
seems to be a sort of aquadag (colloid graphite in water used to paint
on CRT tubes etc.) where they have substituted an acrylic water-base
suspension for the water. Apparently it retains the conductivity after
drying. yeah, sounds like an answer.
Of course you could coat the walls with adhesive and use metal foil
to coat them. copper foil would be best because you can solder the
seams for electrical contact. Aluminum foil would be nearly free but
making good contact a bit more tricky. Perhaps conductive paint down
the seams!
Benj |
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