&Insulation material is a kind of material that can prevent current from passing through. It has great resistance to DC current. Under the action of DC voltage, it is almost non-conductive except for very small surface leakage current. For AC current, there is capacitive current passing through, but it is also considered to be non-conductive. Antistatic products are made of insulating materials.

The higher the resistivity of insulating material, the better the insulation performance. Insulation material is an essential material in electrical products, which accounts for a large proportion in electrical equipment. Generally speaking, electrical machines and electrical equipment are composed of conductor materials, magnetic materials, insulating materials and structural materials. In addition to insulating materials, other materials are metal. During the operation of motors and electrical appliances, they are inevitably affected by the stress and vibration of temperature, electricity and machinery, harmful gases, chemicals, humidity, dust and radiation. These factors have more significant effect on insulating materials than other materials. It can be said that insulating materials are more sensitive to these factors, easy to deteriorate, resulting in damage to electrical equipment. Therefore, the insulation material is the key material to determine the reliability of motor and electrical appliances.

Insulation material is one of the key factors to determine the technical and economic indexes of motor and electrical appliances. One of the important technical and economic indexes of motor is the mass power ratio (kg / kW). Reducing the ratio is of great significance to the motor. From the perspective of the cost of motor and electrical products, the cost of insulating materials accounts for about half of the total cost, which shows the position and role of insulating materials in the motor and electrical industry.