HIGH KV / mm INSULATION
HIGH KV / mm INSULATION
(OP)
I am searching for insulator materials with the highest dielectric strength per thickness possible. The best ones I've found seem to be Teflon @ about 40-80 kV / mm (short time) and CPVC @ about 40 kV / mm (short time).
My problem is that all the values I find say "short time", but this is not going to be a "short time" kind of thing, so I'm trying to find where I can find the "long time" values.
I also would like any suggestions as far as other materials go. I would like to use something that is bondable (not Teflon)
The application is basically for a ion mass spectrometer. It will be two anode plates @ 50-100kV separated by just a few mm, on the other side the plates must be insulated from magnetic pole faces with neutral potential. The insulation must be kept thin so that the magnetic dipole gap can be small for a greater field across the gap.
I appreciate any feedback
-Todd
My problem is that all the values I find say "short time", but this is not going to be a "short time" kind of thing, so I'm trying to find where I can find the "long time" values.
I also would like any suggestions as far as other materials go. I would like to use something that is bondable (not Teflon)
The application is basically for a ion mass spectrometer. It will be two anode plates @ 50-100kV separated by just a few mm, on the other side the plates must be insulated from magnetic pole faces with neutral potential. The insulation must be kept thin so that the magnetic dipole gap can be small for a greater field across the gap.
I appreciate any feedback
-Todd





RE: HIGH KV / mm INSULATION
How about glass ?
RE: HIGH KV / mm INSULATION
RE: HIGH KV / mm INSULATION
I would still be interested to hear input on other materials as I would assume that the PBN is probably pricey and doesn't seem like it's the easiest to machine although it's supposed to be machinable. I also will need some high voltage adhesives also, as itsmoked mentioned, so if there are any brand names or specific products that anyone can recommend that would be helpful also.
-Todd
RE: HIGH KV / mm INSULATION
After years of experience with HV and pulse power, I have yet to find a better bulk insulator than plain acrylic. Easy to machine, available in tube, rod, sheet, billet etc. It will easily withstand 1kV per mil (.001") in thicker sections.
For real thin applications, Kapton is the material of choice, but it is not available in anything but thin sheet form.
Timelord
RE: HIGH KV / mm INSULATION
Also, can you tell me if that 1KV / mil rating is good for long periods of time? How about in the presence of A/C or pulse DC?
Thanks again
-Todd