The product is a two-layer soft composite material made of a layer of polyester film and a layer of insulating paper bonded together. It is an E-grade insulating material. The product has excellent dielectric properties and mechanical strength. It is a stereotyping material for the production of small and medium-sized low-voltage asynchronous motors.

The resistivity is greater than 109Ω.cm materials are called insulating materials in electrical technology. The insulating materials commonly used by electricians can be divided into inorganic insulating materials, organic insulating materials and mixed insulating materials according to their different chemical properties.(1) Inorganic insulation materials: there are mica, asbestos, marble, porcelain, glass, sulfur, etc., mainly used for motor, electrical winding insulation, switch base plate and insulator, etc.(2) Organic insulating materials: shellac, resin, rubber, cotton yarn, paper, linen, silk, rayon, most of which are used in the manufacture of insulating paints, coated insulating materials for winding wires, etc.(3) Mixed insulation materials: various molded insulation materials processed from the above two materials are used as the base, shell, etc. of electrical appliances.

Longkou insulation materials should have good dielectric properties, that is, they have high insulation resistance and compressive strength, and can avoid accidents such as leakage, creepage or breakdown; secondly, they have good heat resistance, especially not due to long-term heating (thermal aging) and performance changes are important; in addition, they have good thermal conductivity, moisture resistance and high mechanical strength, as well as convenient processing.

While not reducing the original electrical insulation properties, improving the breakdown resistance and heat resistance of the insulation materials will play an important role in reducing the manufacturing cost of existing ordinary electronic and electrical products, reducing the weight and volume of the whole machine, and improving operating reliability. It will play an important role in promoting.In recent years, with the development of modern industrial technology, the requirements for the properties of insulating materials in the fields of microelectronics, special motors, electrical manufacturing, aviation, aerospace and other fields are no longer limited to electrical insulation and mechanical properties, and the demand for improving the breakdown resistance and heat resistance of insulating materials is getting higher and higher.Since the composition contains 90% inorganic fibers, inorganic ceramic fiber paper has outstanding heat resistance, heat resistance temperature up to 250℃, long insulation life, and is better than polyarylamide paper in terms of thermal conductivity and paint absorption ability; however, the tensile strength and elongation of inorganic ceramic fiber paper are lower than that of polyarylamide paper, and the paper is relatively soft, which greatly affects its widespread use.Under the premise of ensuring the stable and reliable quality of motors and electrical products, improving the breakdown resistance and heat resistance of the insulating layer is one of the important measures to improve the insulation of motors and electrical appliances. The key to improving the moisture absorption and heat resistance of insulating products lies in the selection of insulating materials with breakdown resistance and heat resistance.