Can I Use JB Weld to Build DIY High Voltage Vacuum Feedthroughs?

[SupaVillain]

I want to build high voltage feedthroughs (vacuum) from epoxying pieces of alumina together, and then epoxying alumina strips on the outside to cover the spaces between. Can I use JB weld, as far as things go electrically? People have reported that JB weld is unexpectedly wonderful for vacuum.

Provided I have the correct amount of alumina per the amount of kv I am applying to it, the electricity won't break down or break through the linings of epoxy will it? It's very expensive to get blocks of alumina and machine them

 

[gleem]

I think it would be useful to see a drawing of the feedthrough and where you intend to use the epoxy. Also what vacuum are you trying to maintain?

 

[SupaVillain]

A vacuum of 10^-4 torr, it's really not a question of design it's more about the epoxy, I am asking if the voltage will be able to move through the epoxy and connect to the vacuum chamber or other nearby objects within the voltages reach.

 

[Nidum]

http://www.jb-weld.co.uk/technical-data-sheets

 

[gleem]

Unless you have the specs on it dielectric strength, or test it with at least twice voltage you intend to use I wouldn't use it. Why do you have to make your own feed through? Experimental rule: if you can buy a part that meets your needs at a reasonable price then buy it. High voltage vacuum feed throughs are common accessories for vacuum systems.