Optical brightener OB is a kind of benzoxazole compound, odorless, mainly used in ... point201-202Ash≤ 0.1Volatile content≤ 0.4% PROPERTIES: Optical brightener OB is a kind of benzoxazole compound, lt is odorless, hard ... used in the polymers, the optimal dosage of optical brightener OB should be adjusted.DOSAGE: (per 100 kg polymer ): PVC ... cool and dry place. Optical Brightener for printing ink /OB 184