Polyphenyl ether, chemically known as poly2,6 -- dimethyl -- 1,4 -- phenyl ether, also known as polyphenyl oxide or polyphenyl ether. Polyphenylene ether is one of the five engineering plastics, is the lightest engineering plastic, halogen-free flame retardant, is also permittivity, dielectric attenuation of the lowest engineering plastic, in new energy vehicles, photovoltaic, integrated circuits and 5G communication has a broad application and market development space.