No

 Specification

food grade Superior grade

 1

 Appearance 

white powder

 2

 Main content                         %≥

 98.0

 3

 P2O5                                    %≥

 58.0

 4

 pH of 1% water solution

 4.2-4.8

 5

 Water insoluble                     %≤

 0.1

 6 

 Heavy metal, as Pb                %≤

 0.001

 7

 Arsenic, as As                       %≤

 0.0003

 8

 Fluoride, as F                        %≤

 0.002

 9 

 Sieve test(Through60mesh)     %≥

 90.0