Product Class: Optical Brightening Agent For Plastic Product Name: Optical Brightening Agent OB-1 Chemical Name: 2.2-(4.4-diphenol vinyl) dibenzoxazol CAS No.: 1533-45-5 C.I. No.: 393 Structural Formula: Molecular Formula: C28H18N2O2 Molecular Weight: 414 Technical Index: Appearance: yellowish green powder Melting Point:358~360°C Purity:â?¥99% Uses : Mainly be used in whitening of polyester and plastic, as well in whitening of Nylon during polymerization. Package: 10kg or 25kg per fiber drum