Hopebright OB-1

OB-1 (C.I. Fluorescent Brightener 393, CAS 1533-45-5) is a benzoxazole-based high-performance optical brightener. It features outstanding thermal stability with high melting point, suitable for high-temperature plastic processing. It delivers strong whitening and brightening effect, low dosage, good migration resistance and excellent compatibility with polymers. Widely used for polyester fiber, masterbatch, PP, ABS, PS, rigid PVC, PC, EVA and engineering plastics. It is the preferred brightener for polyesters and high-temperature thermoplastics.