No 

 Specification               

 Industrial grade 

 Food grade

 1 

 Appearance               

 white powder   

 white powder

 2  

 Main content                  %≥ 

 98.0

 98.0

 3 

 P 2 O 5                               %≥

 42.4

 42.4

 4 

 Na 2 O                             %

 36-40

 36-40

 5 

 pH of 1% water solution 

 11.5-12.5

 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

 0.1

10 

 Sieve test(Through60mesh)         %≥  

 90.0

 90.0