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Non-electrical conductive machinable material

  1. Jun 5, 2009 #1

    I'm searching for a machinable material that in electrically non-conductive and can withstand temps up to 400C. Preferably looking for round-stock > 3"-diameter. I've already looked into machinable ceramics but the cost is > $100 / In.

    Some type of sheet might work too that I can cut. It will be approximately 3/8" thick when completed x 3"-dia. And will be sandwiched between a piece of 3"-diameter aluminum and several electrical leads.

  2. jcsd
  3. Jun 5, 2009 #2


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    You could try glass, some of them are machinable (or blowable / moldable if you have access to a glass blower, and/or can have some molds made). Outside of that, you might want to look into thermosetting plastics:

    Polyimide sounds like it might meet your temperature requirements. Unfortunately, things like teflon and PEEK are just inside (~340 C) of your desired operating temperature:

    EDIT: Just noticed the other bit about sandwiching this stuff between electrodes. You may want to look into high-temperature silicone, as well. If you need really precise shapes, you can probably get something cast. I googled silicone sheet, and these guys popped up (they'll sell you silicone slabs of varying firmness, depending on how much deformation you can accept):
    Last edited by a moderator: Apr 24, 2017
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