The Optical Brightener OB-1 is used to whiten and brighten PVC, PS, PP, ... used in thermoplastic plastics. PVC, PE, PP, PS, ABS, SAN, SB, CA, PA, PMMA, acrylic resin. polyester fiber paint, coating the ... net weight of each drum is 25kg .The Optical Brightener OB-1 Optical Brightener ...