Insulating material is used to isolate solids from different conductors. Generally require solid insulation material both support. Solid insulation materials due to high density, and therefore the breakdown strength is much higher, solid insulation materials, insulation resistance, dielectric constant and a wide range of changes.
Solid insulating materials can be divided into inorganic and organic two categories.
Inorganic solid insulation materials: mainly powder mica and mica products, glass, glass fiber and its products, as well as porcelain, alumina film. They are resistant to high temperatures, are not aging, have considerable mechanical strength, some of which are materials such as low cost, occupying a certain position in the application.
The glass process is simpler than the ceramic and can be used to make it. Glass fiber can be made of silk, cloth, belt, with much higher than the organic fiber heat resistance, in the insulation structure to the development of high temperature plays an important role.
Organic solid insulation materials: natural in the 19th century, such as paper, cotton, silk, can be cured of vegetable oil. These materials are compliant, to meet the application process requirements, and easy to obtain.
Silicone resin combined with less alkaline glass cloth, greatly improved, the heat resistance grade. Polyethylene formaldehyde made of paint-based enameled wire to open up the broad prospects for enameled wire, replacing the silk and yarn package line. Polyester film thickness of only a few tens of microns, with it instead of the original paper and cloth, so that motor, electrical technology and economic indicators greatly improved. Polyarylamide fiber paper and polyester film, polyimide film used to make the motor slot insulation heat rating were F and H level. The elastomeric material also has a similar development, such as heat-resistant silicone rubber, oil-resistant nitrile rubber, and subsequent fluororubber, ethylene propylene rubber and the like.
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