Fluorescent brightener OB-1 C.I.Index No.: Fluorescent brightener 393 Trade Name of Foreign Similar Product: Eastobrite OB-1 Properties: Melting Point: 355-360 Max. Wavelength of Ultraviolet Absorption: 374nm Max. Wavelength of Fluorescent Emission: 434nm Specification: Appearance: yellow powder Strength%: similar to Eastobrite OB-1 Shade: similar to standard product DOSAGE(per 100kg polymer): PVC white 0.01-0.05%(10-50g)you can adjust the dosage according the using effectTransparent 0.0001-0.001%(0.1-1g) PS white 0.001%(about 1g) transparent 0.0001-0.001%(0.1-1g) ABS natural color 0.01-0.05%(10-50g) white 0.01-0.05%(10-50g) PE,PP colorless 0.0005-0.001%(0.5-1g) white 0.005-0.05%(5-50g) Other plastic are like above PACKAGING:Packaged in cardboard barrels,50kg or 25kg each.