PVDF mainly refers to a copolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and other small amount of fluorine-containing vinyl monomer. It has the characteristics of fluororesin and general-purpose resin, in addition to good chemical resistance and high temperature resistance. In addition to oxidation resistance, weather resistance, and radiation resistance, it also has piezoelectric, dielectric, and pyroelectric properties.