Profile: Hebei Xingyu Chemical Co., Ltd. specializes in providing basic dyes & intermediates, fluorescent brighteners & intermediates, thiourea dioxide and industrial potassium carbonate. We also offer basic zinc carbonate, toluhydroquinone, sodium cumenesulfonate and manganese carbonate. Fluorescent brightener ER-FBA 199 is suitable for terylene chemical fiber, acetate fiber, polyamide fiber and plastics for whitening & blooming processes. Thiophene-2,5-dicarboxyl acid is a white or off-white powder. It is used as an intermediate for pharmaceutical optical brighteners. We are accredited with ISO 9002 certification.