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