Appearance: White or almost white, very hygroscopic powder 
Identification: Positive Reaction           
PH:  9.0 ~ 10.5              
Specific optical rotation:  -13.0°~  -15.0°   
Clarity of solution: Clear (1# Max)           
Color of solution: B₉ Max         
Water:1.0% Max                 
1,2-Dihydroxypropyl Phosphonate:1.0% Max          
Heavy metals:20ppm Max                 
Assay:95.0~101.0%