Product Name: Optical Brightener OB-1 Chemical Name: 2,2'-(Vinylenedi-p-phenylene)bisbenzoxazole Molecular Formula: C28H18N2O2 Molecular Weight: 414.4 UV absorption wavelength: 374nm Cas No.: 1533-45-5 C.I. No.: 393 EC No.: 216-245-3 Specifications: Appearance bright yellowish/greenish crystal powder Melting Point 357-361 Purity â?¥98.5% Color Shade Blue Fineness â?§200 mesh Water insoluble Content â?¦0.5% Properties: Optical brightener OB-1 is crystallized substance, has strong fluorescence. It is odorless, hard to dissolve in water. It can be used for whitening polyesters, nylon fibre and various plastics such as PET, PP, PC, PS, PE, PVC, etc. Package: 25kg per carton drum with double layer PE bag inside, or adjust according to clients demand. Storage: Store at cool and dry place. Expiry date: 24 months.