There is nothing really wrong with mica if it is of good quality and
mounted right. All insulators eventually carbonize and become conductive
(even silicon rubber ones which turn into white puffy slimy dust with
nil mechanical resistance when heated enough), but mica does not, as it
contains no carbon afaik. It withstands very high temperatures (as in hot
air blowers that run at 500+degrees C etc).

Peter

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