U-R-179 Resin, Acrylic, Dental (S/S By A-A-53940)This specification covers acrylic resin composed of any of the following types of resin: (1) polyesters of acrylic acid, (2) polyesters of substituted acrylic acids, (3) vinlyesters (4) polystyrenes or, (5) copolymers, or mixtures, of any of the foregoing resins.