ITEM	STANDARD
Na5p3o10 % ≥	95.0
p2o5 % ≥	57.0
water insoluble % ≤	0.05
F % ≤	0.003
As % ≤	0.00013
Heavy metals (Pb) % ≤	0.001
chloride (Cl) % ≤	0.025
sulphate (so4) % ≤	0.4
whiteness % ≥	85
ph(1% aqueous solution)	9.5-10.0