A polymer of acrylonitrile that is the basic material used in the manufacture of a number of synthetic fibers, e.g., “Orlon” and “Dynel.” When combined with other materials it produces a hard resin having high solvent resistance
and high-temperature stability; from these are made such items as moldings, shoe soling, wall panels, and the like. See Acrylonitrile; Acrylic Resin; Acrylic Fiber.