Acrylic yarn is a kind of chemical fiber, and its performance is very similar to wool, so it is called "synthetic wool". Molecular structure: Acrylic fiber is unique in its internal large substructure, showing an irregular helical conformation, and there is no strict crystalline region, but there are high-order and low-order arrangements. Because of this structure, acrylic fiber has good thermal elasticity (bulked yarn can be processed), and the density of acrylic fiber is smaller than that of wool, and the fabric has good thermal insulation. The elasticity is better, second only to polyester, about 2 times higher than nylon, and has better shape retention. At a temperature of 20 °C and a relative humidity of 65%, the moisture absorption rate is only 1.5%, so it has the advantage of not being afraid of water and not deformed after entering the water, it can always keep the hairy shape, and it can still be smooth and wrinkle-free after continuous washing.

　　The light fastness of acrylic is the best of all synthetic fibers for one year of open-air exposure, with only a 20% drop in strength. Because acrylic yarn has good fluffiness and soft hand, it is often used to make wool, carpets, etc.; because of its good weather resistance, mildew resistance and moth resistance, it can also be spun purely or blended with natural fibers, and is widely used in various tarpaulins, decoration, and industrial fields, curtains and other industries; because of its good warmth, it is also used to make clothing, plush, artificial fur, etc. Acrylic yarn is characterized by good sunlight resistance and weather resistance (ranking first), poor moisture absorption, and difficult dyeing. Pure acrylic fiber has a tight internal structure and poor wearing performance, so by adding the second and third monomers to improve its performance, the second monomer improves elasticity and hand feel, and the third monomer improves dyeability.

　　The light resistance and weather resistance of acrylic fibers are the best among all natural fibers and chemical fibers, except fluorine-containing fibers. The main use of acrylic fiber is civilian, it can be spun or blended to make a variety of wool, wool, blanket, sportswear; also: artificial fur, plush, bulked yarn, hose, parasol cloth, etc.