No

 Specification              

food grade Superior grade

 1 

 Appearance    

 white powder

 2  

 Main content                         %≥

 98.0

 3 

 P2O5                                    %≥

 32.8

 4 

 K2O                                     %≥

 65.0

 5 

 pH of 1% water solution

 11.5-12.5

 6  

 Water insoluble                     %≤

 0.05

 7 

 Heavy metal, as Pb               %≤

 0.001

 8 

 Arsenic, as As                      %≤

 0.0003

 9 

 Fluoride, as F                        %≤ 

 0.003

 10

 Sieve test(Throngh 60 mesh)  %≥

 90.0