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In 60s, the heat resistant resins containing heterocyclic and aromatic rings have made great progress, such as polyimides, polyaromatics, polysulfone and polyphenylene sulfide, which belong to H grade and higher heat-resistant materials. The synthesis of these heat-resistant materials has created favorable conditions for the future development of F class and H grade motor. Polypropylene films have also been successfully used in power capacitors at this time.

Thermosetting resin composite materials refers to thermosetting resins such as unsaturated polyester resin, epoxy resin, phenolic resin, vinyl ester resin as matrix, glass fiber, carbon fiber, aramid fiber and UHMWPE fiber reinforced composite material. Epoxy resin is characterized by excellent chemical stability, electrical insulation, corrosion resistance, good adhesion and high mechanical strength. It is widely used in chemical, light industry, machinery, electronics, water conservancy, transportation, automobile, household appliances and aerospace etc.

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