(1) A polymer of acrylonitrile, used in the production of manufactured fibers, as a fabric finish and as a size. (2) A synthetic resin prepared from acrylic acid or from a derivative of acrylic acid. Polymers of acrylic or methacrylic esters, sometimes modified with nonacrylic monomers such as the ABS group. The acrylates may be methyl, ethyl, butyl, or 2-ethylhexyl. Usual methacrylates are methyl, ethyl, butyl, laural, and stearyl. The resins may be in the form of molding powders or casting syrups and are noted for their exceptional clarity and optical properties. Acrylics are widely used in lighting fixtures because they are either slow burning or self-extinguishing and do not produce harmful smoke or gases in the presence of flame.