WE ARE THE LEADING MANUFACTURER AND EXPORTER OF PHOSPHOTUNGSTIC ACID. WE EXPORTS THE SAME TO UNITED STATES, BRAZIL, TURKEY AND VIETNAM. WE ARE ALSO SUPPLYING TO LEADING REPACKERS OF LABORATORY CHEMICALS. HERE ARE THE SPECIFICATIONS OF PHOSPHOTUNGSTIC ACID. -MW Max 6628 -Loss on ignition at 750 oC Max 17% -Insoluble Matter Max 0.01% -Fe Max 0.02% -CL Max 0.01% -SO 4 Max 0.01% -Nitrogen Max 0.05% -PB Max 0.005% -CU Max 0.001% ALSO WE ARE MANUFACTURING BELOW PRODUCTS: AMMONIUM CERIC NITRATE AMMONIUM CERIC SULPHATE CERIC NITRATE CERIC SULPHATE CERIUM OXIDE PHOSPHO TUNGSTIC ACID SILICO TUNGSTIC ACID PHOSPHO MOLYBDIC ACID SODIUM ARSENATE SODIUM ARSENITE LEAD PERCHLORATE LITHIUM PERCHLORATE BARIUM PERCHLORATE DI BORON TRIOXIDE