We are an EU approved CE certified, REACH Certified and RoHS Certified company manufacturer of Optical Brighteners OBA 220 for Paper Industry. We all want our papers to be as white as possible, don't we? Well, that's where optical brightening agents BBU Powder come in. The raw material of paper often consists of impurities such as snippets of bamboo sticks and wood. These impurities dampen the brightness of the paper. We have various Whitening Agent Optical Brightener Available for Paper application like... Optical Brightening Agent OBA 220 in powder form Optical Brightening Agent OBA 220 in Liquid form Optical Brightening Agent OBA 264 in Liquid form Optical Brightening Agent OBA 24 in powder form Optical Brightening Agent OBA 253 in Liquid form Optical Brightening Agent OBA 28 in powder form Optical Brightening Agent OBA 154 in Liquid form Optical Brightening Agent OBA 28 in powder form. Additional Information Physical Appearance : Greenish-Yellow Powder CAS No.: 16470-24-9 EINECS No.: 240-521-2 Specific Gravity / Bulk Density : 0.8-1.0 pH of Liquid or 1% Solution : 8-9 Strength by 100% : 100% Shade/Hue: Bluish white Whiteness/ Brightness : Equal to Std % of Active Substance : 21.95% Absorbance (18mg/l) : 0.217 Moisture Content : 2.40%