Mica insulator

In the manufacturing of electronic devices, a mica insulator is a die-cut punched insulator of natural or "block" mica splittings.

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Micas are a group of aluminium phyllosilicate minerals which are found worldwide. Commercial deposits are found in India and Madagascar. It is mined in the form of "blocks" or rocks, which are then rifted to arrive at thin flexible natural mica splittings. When these are die-cut specifically for the transistor industry, the resultant product is called a "mica insulator".

Resin-bonded mica or micanite or built up micanite from splittings or agglomerated micanite made from pulped mica powder are called micanites. All these products have additives, like resins, and the resultant products, while having inferior insulation properties to natural "mica insulators" are called micanites or micafoliums.