Indexes                                   Industrial Grade
Assay Na5P3O10 %                        ≥94.0 
P2 O 5 %                                      ≥57.0 
Water Insoluble Matter %                ≤ 0.15 

Iron(Fe) %                                     ≤ 0.015 
PH value (1% water solution)           9.2-10.0 
Whiteness %                                   ≥90 
Ignition loss                                     1.0 
density (g/cm3)                              0.35-0.9 
Phase I                                            10-30