There are mainly two types of modified polyacrylonitrile fibers produced in the recent industrial production: fibers made of copolymer of acrylonitrile and vinyl chloride; The fiber is made of the copolymer of acrylonitrile and vinylidene chloride, namely vinylidene chloride polyacrylonitrile fiber. These two types of modified polyacrylonitrile fibers are sometimes collectively referred to as nitrile chloride fibers, which have good flame retardancy.

Acrylic fiber is called artificial wool. It has the advantages of softness, bulkiness, easy dyeing, bright color, light resistance, anti-bacterial, and worm resistance. It can be pure spun or blended with natural fibers according to the requirements of different uses. Its textiles are widely used in clothing, decoration, industry and other fields.