Chemical name: 2.5-Bis-(5-tert-butyl-2-benzoxazolyl)thiophene CAS No.：7128-64-5                                Molecular formula：C26H26N2O2S Molecular weight：430                                            Appearance: Slight greenish yellow powder Assay, %：≥98.0 Melting point，℃：200 – 204 Volatility, %: ≤0.5 Ash, %: ≤0.5 Particle size: pass 200 mesh                                                            Optical Brightener OB has excellent thermal stability, special whitening performance, good light stability and low volatility. It has an excellent blue effect. It is easily soluble in organic solvents and has good compatibility in different substrates. It is especially suitable for film and sheet for whitening and brightening of polyvinyl chloride, polystyrene, polyethylene polypropylene, thermoplastics, ABS, acetate, paints, paints and printing inks. The maximum absorption of the spectrum is 375 nm (in ethanol) and the maximum emission wavelength is 435 nm (in ethanol).  info at hhochem. com