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Look at products from companies such as Bergquist and Laird.All you had to do was search for something such as 'thermally conductive insulator' or go to the product search for some one like Digikey or Mouser or even Walmart.
The data sheet shows its electrical conductivity as 105 S/cm = 107 S/m, approximately that of graphite, while copper metal is approximately 6 x 107 S/m
According to https://sound-au.com/heatsinks.htm#s7 Kapton (polyimide) tape/sheet has a similar thermal resistance to Sil-Pads. Not cheap for the area you have in mind.
Quote from: pqass on September 20, 2021, 10:05:11 pmAccording to https://sound-au.com/heatsinks.htm#s7 Kapton (polyimide) tape/sheet has a similar thermal resistance to Sil-Pads. Not cheap for the area you have in mind.Kapton's not that expensive. McMaster-Carr has 12"x12" 1 mil sheets for $12. Laird sell a polyimide film pre-coates with a ceramic phase change material which is quite convenient if the mating surfaces are flat, called Tgard K52. I think it's like $30 for an ~11x18" sheet or something. If the surfaces aren't flat enough for that to work well you can also apply your own thermal compound either side of the plain film, the conductivity of the compound doesn't matter at that point as long as it doesn't bridge over the edge of the film. But it's probably not worth using anything fancy anyway, the regular silicone stuff is probably fine since you have the polyimide film in the anyway.