... . 1,Chemical Name: Sodium Hexametaphosphate,Sodium Tetrapolyphosphate.2,M. F. : (NaPO3)63,M. W. :611.174,Physical properties: White powder,density ... .1Iron (Fe) ≤%0.05-PH (1% aqueous solution) 5.8-6.5-Arsenic (As) ≤%0.00030.0003Heavy Metal (as Pb) ≤%0 ...