... and USP. 1,Chemical Name: Sodium Hexametaphosphate,Sodium Tetrapolyphosphate.2,M. F. : (NaPO3)63,M. W. :611.174,Physical properties: White powder,density ... is 2.484(20°C),easily soluble in water,but nearly ... to dampness. it easily chelate with metallicions such as Ca,Mg.5,Quality standard:(GB1890-1989,FCC-IV) Name of index ...