Electronic – Thin insulation for 400v plates

high voltageinsulation

In a design of mine, I need to place two plates on top of each other as close as possible. With a 400v potential difference possible between the plates, what is the best material that can be placed in a very thin layer between the plates to keep them electrically isolated? I understand that there will be a degree of capacitance induced by such a setup, but it will be negligible for me.

I have thought about KAPTON tape. All of this is very small (< 5mm plates).

I found the following quote on DuPont’s website about their KAPTON polyimide tape:

Excellent dielectric strength makes Kapton® polyimide film a perfect material for thin electrical insulation applications. With a dielectric strength rating of 7700 V/mil for a .001”-thick film, no other material can provide such protection in such a small space.

Best Answer

In a design of mine, I need to place two plates on top of each other as close as possible. With a 400v potential difference possible between the plates, what is the best material that can be placed in a very thin layer between the plates to keep them electrically isolated? I understand that there will be a degree of capacitance induced by such a setup, but it will be negligible for me

If 0.002" is not too thck:

Per mil - ~= mica 3000 V, Teflon 1500 - 4000 V

So for 5 x 5mm square plates Mica seems "useful".

Digikey mica insulator
0.002" thick (6000 V nominal) - $0.42 in stock. MAkes maybe 4 OF 5 X 5 mm spacers.

Thinner may be available.

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