1、Chemical Name: Sodium Hexametaphosphate、Sodium Tetrapolyphosphate. 2、M. F. : (NaPO3)6 3、M. W. :611.17 4、Physical properties: White powder，density is 2.484（20℃），easily soluble in water，but nearly insoble in organic solution，it is absorbent to dampness in the air。absorbabsorbent to dampness. it easily chelate with metallicions such as Ca,Mg. 5、Quality standard:（GB1890-1989、FCC-Ⅳ） 6、Packing: It is packed with ployethylene bags as line-r , and a woven bag as the outer layer. The net weight of each bag is 25kg. 7、Storage and transport: It should be stored in a dry . ventilative and clean warthouse; kept away from moisture and hot, Furthermore, it should be stored separstely from poisonous Substances.