Thermal conductivity is high so mica insulators are useful for heatsinking transistors or other components with electrically conductive cases. Puncture resistance is good but the edges of the mica should be flush against a flat surface to prevent flaking. Mica finds uses in composite tapes and sheets which are useful to 600 degrees centigrade with excellent corona resistance. Sheets and rods of mica bonded with glass can tolerate extreme temperatures, radiation, high voltage, and moisture. This rather expensive laminate may be machined and it will not burn or outgas.
Neoprene rubber is the material used for most wet suits.
This black rubber is commonly used for gaskets, shock absorbers, grommets, and foams. Nomex is a Dupont aromatic polyamide with an operating temperature range over 220 degrees centigrade and with superb high voltage breakdown. It is an excellent choice for standardization since it outperforms many other materials. Nylon has good resistance to abrasion, chemicals, and high voltages and is often used to fashion electro-mechanical components. Nylon is extruded and cast and is filled with a variety of other materials to improve weathering, impact resistance, coefficient of friction, and stiffness.