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RichfortuneChem:A Global Leader in Specialty Additives, Intermediates andHeat Transfer FluidsIn 1992, we firstly developed and tried to produce OpticalBrightener OB. In 1995, started manufacture 2,5-thiophenedicarboxylicacid(also called OB ...
optical brightener, heat transfer fluid, intermediate, rubber accelerators, antioxidant, uv absorber, flame retardants,