N Cook wrote:

Not the usual nylon or whatever ones that I never trust for high
temperatures (soften and deform over time, loosening thermal connection,runs
hotter, melts more ......

I can't say I've ever seen that myself.


Does anyone make them from whatever the plastic/mineral? is used for the
body of power transistors themselves, what is that material , what is it
called?

You mean Mica. It's a natural mineral. And no, transistor bodies aren't made
from mica btw.

http://uk.farnell.com/jsp/search/bro...tt= mica&Ntx=

Graham