 
								 
								 
								 
								Tech grade Used as fire-extinguishing agent for fabric, woods, paper; as soft water agent for boilers; as food additive, and so on.
Food grade Used as boiler water softener; treatment of leather and fabrics to increase weight; flame retardant for fabrics, wood and paper in dyeing; culture medium for biochemical treatment; raw material for production of sodium pyrophosphate and other phosphates. 
                        
                    
	
 
	
| ITEM | SPECIFICATION | |
| TECH GRADE | FOOD GRADE | |
| Main content | ≥98.0 % | ≥98.0% | 
| PH of 1% solution | 8.8-9.2 | 9.0-9.4 | 
| Sulfate, as SO4 | ≤1.2 % | ≤1.2% | 
| Chloride, as CI | ≤0.05 % | ≤0.02% | 
| Fluoride, as F | ≤0.1 % | ≤0.005% | 
| Heavy metal, As Pb | - | ≤0.001% | 
| Arsenic, as As | - | ≤0.0003% | 
| Water insoluble | ≤0.10 % | ≤0.20% | 
	 
 
	 
 
