[uses]: used to manufacture metaphosphate in medical or food industry. Used as a high effective k and p compound fertilizer. It contains totally 86% fertilizer elements, used as a basic raw material for n, p and k compound fertilizer. [standard executed]: hg2321-1992 Specifications Specifications technical grade food grade Main content, as kh2po4min98.0 99.0 Potassium oxide, as k2omin 33.9 34.0 Phosphorus pentoxide, as p2o5min51.251.5 Moisture. Max 0.2 0.2 Ph of 1% water solution. 4.3-4.8 4.3-4.8 Water insoluble. Max 0.1 0.1 Chloride, as cl. Max _ 0.02 Fluoride, as f. Max _ 0.005 Heavy metals, as pb. Max _ 0.001 Arsenic, as as max _ 0.0003 [packing]: plastic knit bag, net weight 25 kg