The performance of polyacrylonitrile fiber is very similar to wool, with good elasticity. When it is stretched by 20%, the resilience can still be kept at 65%. It is fluffy, curly and soft, and its warmth retention is 15% higher than that of wool. It is called synthetic wool. The strength is 22.1~48.5 cN/tex, which is 1~2.5 times higher than wool. It has excellent light resistance. It can be used as curtain, curtain, tarpaulin, and cannon coat after being exposed to the sun for one year. It can resist acid, oxidant and general organic solvent, but has poor alkali resistance.