Optical brightener OB-1 is mainly used for lanon and widely applied to ... ,-4'-vinyl biphenyl) dual benzoxazoleCAS No: 1533-45-5Structural NO.: C.I.393Molecular formula: C28H18N2O2Molecular weight: 414.4Appearance: Yellowish Green granuleMelting point ... , PS, HIPS,PA,PC, EVA and hard PVC etc. optical brightener OB-1