What are the characteristics of commonly used insulation materials

Since the insulating material has a resistivity of more than 107 rn, only a very small current is passed under the applied voltage, which is generally considered to be non-conductive. The main characteristic of insulating materials is its insulating properties and heat resistance. The insulation performance is measured by the insulation compressive strength; the heat resistance refers to the ability of the insulating material to change its dielectric, mechanical, physical and chemical properties under high temperature.