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Anonymous Poster

conductivity agent for coating

01/30/2010 11:22 AM

If you were to make a conductive coating, what would be the agents you would recommend?

I see in some sources silver bead and flakes while in other some aliminum particles. Some say carbon can also be used.

Any experience with that? Which is best, which one can achieve reasonable conductivity?

Secondly, does anyone recommend any binder for those kind of applications?

Thnx

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#1

Re: conductivity agent for coating

01/30/2010 12:22 PM

Ag is the best for conductivity. And oxides of silver remain conductive. It's what is used in the aerospace industry. Use an epoxy resin as the carrier. You want a resin with a low coefficient of thermal expansion. If the material expands too much you will loose conductivity.

I've used Ag filled silicones many times in the past. If heated beyond a certain temperature, they become totally non-conductive.

Just Google conductive epoxy.

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#2

Re: conductivity agent for coating

01/30/2010 12:23 PM

It depends upon your purpose for conductivity. We had one of our 500'000 gallon fuel tanks lined with concrete and epoxy (to prevent future leaks) and they finished with a black conductive coating. I believe it was carbon in an epoxy paint.

Our purposes for the coating was to relax static charge from the fuel during and after receipt.

A quick google search for conductive paint coating brought up several solutions and products ranging from silver/aluminum paints to metallic coatings plus graphite (carbon).

Drew

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#3

Re: conductivity agent for coating

01/30/2010 1:31 PM

Drew K's comments are more to the point.

Depends if you want to conduct electricity or just bleed a charge from a surface.

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Anonymous Poster
#4

Re: conductivity agent for coating

01/30/2010 2:58 PM

"Make a conductive coating" ... In most cases "purchase a factory made conductive coating" is a better way to approach the problem. Others have already paid the price of trial and error.

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Anonymous Poster
#5
In reply to #4

Re: conductivity agent for coating

01/30/2010 3:25 PM

hi again,

one problem with that is the companies which produce conductive coatings and paints sell them for gold like prices. For the house wellness in order to coat the glass (window) and paint the room the total target budget is around 1000 dolar.

So if the price of the most affordable german paint is 350 Euro a galon then the budget with the glass curtain is simply destroyed even if one paints everything on his own.

My estimation is that if the price of a galon of paint can be 150 USD a galon then it can be a real improvement in people's wellness. For more information of EM rad on health you may check the relation on melatonin and EMF.

But I need a coating or a paint with an affordable price where the target is not to leak out the random currents but to establish a resistance 200 ohm/cm or less with affordable materials. Graphite is one of them but it is not enough alone while silver flakes are damn to expensive.

Now I need your help again.

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#6
In reply to #5

Re: conductivity agent for coating

01/30/2010 9:50 PM

Conductive materials are expensive. Silver, copper, tin, are used commercially as well as carbon fiber and steel.

The textiles are interesting. Using conductive threads in a woven pattern may be a way to economize and maximize the value returned for material invested. Thin wire can be used, or you could try making conductive thread. One thing about a textile, you can easily test it to see if the design produces the desired effect. Another thing, with textile you can start small if you don't have much money. Make a blanket first and test it and improve on it until you're satisfied that the design is right. Then make enough to cover your interiors if that's what you want to do.

Coating the windows with paint sounds nasty. Unless of course it's clear. A polarizing film is marketed for windows - expensive, it's true. Nice product.

I have seen conductive nanotubes marketed as a powder to mix paint, but I think it's been established there are health risks for certain, in handling the powder, and unknown risks if the tubes are around in your environment that would defeat the purpose of being concerned about your health.

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