In article .com, bschwand
says...

I do not know how to make an electrically insulated, vacuum and heat
resistant electrical port. The material of the port needs to be as
inert and heat resistant as possible, it can not release gases or any
contaminant under vacuum (thus drilling a hole in the chamber, putting
a rod through and sealing it with epoxy or any resin won't work). I
thought of using glass, but I can not fuse the glass to the metal
because of the different thermal expansion rate of glass and metal.

You need to define what pressure you need to achieve.

10e-3 torr?

10e-6 torr?

10e-12 torr?

Once you define a desired pressure range, that will
deterrmine the kinds of vacuum feedthroughs you will
pick.

Jim


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