Fluorescent brightener OB (C.I.184) CAS Number: 7128-64-5 Appearance: Bright yellow ... crystal powder Content: 99.0%min Fluorescent brightener OB (C.I.184)Chemical name: 2.5-bis(5-tert-butyl ... in thermoplastic plastics. PVC, PE, PP, PS, ABS, SAN, SB, CA, PA, PMMA, acrylic resin. polyester fiber paint, coating the brightening ...