A Global Leader in Specialty Additives, Intermediates and Heat Transfer Fluids In 1992, we firstly developed and tried to produce Optical Brightener OB. In 1995, we started to manufacture 2,5-thiophenedicarboxylic acid(also called OB acid) and other kinds Optical Brighteners( OB-1, FP-127, ER) . In 2005, we started to make Biphenyl series, Optical Brightener CBS-X and Heat Transfer Fluids.