The document discusses acrylic fiber, including its definition, chemical composition, properties, characteristics, advantages, uses, and commercial applications. Acrylic fiber is a synthetic fiber made from polymers containing acrylonitrile. It is often used as an artificial replacement for wool in applications like sweaters, socks, and blankets due to its softness and insulating properties. Major uses of acrylic fiber include knit apparel, carpets, and home furnishings due to its ability to wick moisture, durability, and resistance to moths and chemicals.