Appearance:white crystals, 
 pH:4.0-5.0 
Cl:0.01% max,  

Assay:98.0% min, 
K2O: 38.4% min,
P2O5: 58.3% min, 
Fe (mg/kg):50 max,
Moisture:0.1% max , 

Molecular Weight:120.07,
Heavy metal (mg/kg):50 max,
Molecular Formula:KH2PO3,
Phosphate (as PO4):0.2% max, 

Insoluble matter in water:0.3% max,