Profile: Shanghai Purity International Trade Co., Ltd. provides active pharmaceutical ingredients and food additives. Our products include tetra potassium pyrophosphate, sodium sulfide, sodium sulfate, sodium nitrite, sodium nitrate, potassium hydroxide, phosphoric acid, and potassium carbonate. Tetra potassium pyrophosphate is available as a white block or powder grain. It is deliquescent and soluble in water. It is widely used as a cyanide-free electroplating and detergent agent. sodium sulfate is used as a filling material in detergent, as cooking agent in the production of sulfate pulp in paper-making industry and is used as a substitute of soda in glass industry. It also serves as a raw material to produce sodium sulphide, sodium silicate and other chemicals. It is also used in textiles, pharmacy & leather industries.