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Organic solid insulating material is a kind of insulating material of solid insulating material. Solid insulation is a solid that is used to isolate different potential conductors and also has a supporting role. Compared with the gas and liquid insulating material, the density is high and the breakdown strength is much higher, which is of great significance to reduce the insulation thickness. Including insulation paint, plastic insulation, insulation paper, fiber insulation products, plastics, rubber, paint and linoleum pipe insulation impregnating fiber products, electrical products and composite film, adhesive tape, electrical laminate etc.

In the early nineteenth Century, it was mainly made of paper, cotton, silk, rubber and curable vegetable oil. These materials had flexibility, which could meet the requirements of application process and were easy to get.
In twentieth Century, synthetic polymer materials were used. The first is bakelite is used as insulating material, later appeared in polyethylene, polystyrene, due to their dielectric constant and dielectric loss is very small and can meet the high requirements, to adapt to the development of new technologies such as radar. Organosilicon resin combined with less alkali glass cloth, greatly improve the heat resistance of motor and electrical appliances.

Formaldehyde is made of polyethylene paint enameled wire opened up the wide prospect of the enameled wire, instead of wire and wire. The thickness of the polyester film is only a few tens of microns. It is used to replace the original paper and cloth, so that the technical and economic indexes of the motor and electrical apparatus are greatly improved. Polyaramid fiber paper, polyester film and polyimide film are used to make the heat resistance of motor slot insulation grade F and H respectively (see insulation heat resistance grade and thermal aging test). Elastomer materials also have similar developments, such as heat-resistant silicone rubber, oil resistant nitrile rubber, and subsequent fluorine rubber, ethylene propylene rubber, etc.

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