1 Product optical brightener OB 2 CAS No. 7128-64-5 3 MF C26H26SO2N2 4 Appearance yellow crystal powder 5 Melting 198-201 Product nameoptical brightener OBCAS No.7128-64-5MFC26H26SO2N2Chemical name2.5-bis(-tert-butyl-2-benzoxazolyl)thiopheneAppearanceBright yellow crystal powderMelting Point198-201°CPurity99.0%(min)Use: It is used in thermoplastic plastics. PVC, PE, PP, PS, ABS, SAN, SB, CA, PA, ...