Classification of insulating materials

Insulating materials commonly used by electricians can be divided into inorganic materials, organic insulating materials and mixed insulating materials according to their chemical properties.

(1) Inorganic insulating materials: mica, asbestos, marble, porcelain, glass, sulfur, etc., mainly used for motor and electrical winding insulation, switch bottom plates and insulators.

(2) Organic insulating materials: shellac, resin, rubber, cotton yarn, paper, hemp, silk, rayon, most of which are used to make insulating varnish and coating insulation for winding wires.

(3) Mixed insulating materials: various shaped insulating materials processed from the above two materials, used as the base and shell of electrical appliances.