No 

 Specification               

 Food grade Superior grade

 1 

 Appearance               

 white powder

 2  

 Main content                    %≥ 

 98.0

 3 

 P2O5                               %≥

 42.4

 4 

 Na2O                               %

 36-40

 5 

 pH of 1% water solution 

 11.5-12.5

 6      

 Heavy metal, as Pb           %≤ 

 0.001

 7 

 Arsenic, as As                  %≤

 0.0003

 8 

 Fluoride, as F                   %≤

 0.002

 9

 Water insoluble                 %≤

 0.1

10 

 Sieve test(Through60mesh)%≥  

 90.0