Uses]: used for boile water treatment, ferment industry(phosphor and kalium regulator)and liquid fertilizer, and buffering agent for ethylene glycol regrigeran [standard executed]:enterprise standard Specifications specifications technical grade food grade Main content, as na4p2o7min98.098.0 Phosphorus pentoxide, as p2o5. Min 30.5 30.5 Ph of 1% water solution. 9.9¡«10 9.9¡«10 Water insoluble. Max 0.1 0.1 Potassium oxide(as k2o)max Through test Through test Heavy metals (as pb) Max --- 0.001 Arsenic, as as. Max ---- 0.0003 Chloride(as k2o) Max 0.3 0.3 [packing]: plastic woven bag, net weight is 25kg.