... ,E11 1145-1180.solubility; 25g/L at 25'C. Purity 98.2% min. Optical Brightening Agent for detergent, CBS-X (OBA 351) CAS ... at 25°C Packaging: Packaged in cardboard drums, 25kg eachProperties:Fluorescence Brightener CBS-X is bis-cinnamene monobiphenyl type optical fluorescence ... brightener 31#, the effect will be better. detergent whitening agent/Optical Brightening Agent for detergent/OBA CBS-X 351