ميكا

Mica are sheet silicates historically significant for their ability to be split into large, thin sheets that are uniquely useful for their electrical, thermal, and mechanical properties. They have high electrical and thermal insulating properties; they are resistant to chemical attack; they can be split into

transparent or optically flat films; and they can be cut or stamped to shape .

-it have several types :

1- Sheet mica Sheet mica consists of "books" of mica laminate and is classified according to the thickness, purity, and maximum usable area that can be cut or stamped.

2- Built-up mica Also known as micanite, built-up mica is a fabricated sheet of desired thickness made by overlapping irregularly shaped splittings and then binding them together with an organic or inorganic binder, heat, and pressure ,it is produced as an alternative to natural sheet mica for electrical insulation applications..

3- Mica paper Mica paper is a fabricated alternative to natural sheet and builtup mica products. Scrap mica is delaminated through a combination of thermal, chemical, and mechanical treatments , on a papermaking machine into a continuous, homogeneous sheet of uniform thickness..

4- Flake mica Flake mica is essentially nonfactory-generated scrap mica. It is recovered by flotation from mica ores, from which quartz and feldspar are also generally separated and recovered, or as a floated byproduct during the beneficiation of feldspar, kaolin, or lithium-bearing ores.