Common inorganic insulating materials: mica, asbestos, marble, porcelain, glass, sulfur, etc., mainly used for motor winding insulation, appliances, switch backplane and insulators. 

    organic insulating materials: shellac, resin, rubber, cotton, paper, hemp, rayon, etc., for the manufacture of most of the insulating varnish of the winding wire of the insulating cover and the like. 

    Forming an insulating material by mixing various insulating materials made of these two materials processed, and used as electrical base shell. 

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