Sodium Hexametaphosphate(SHMP) (CAS No.: 68915-31-1 ) Executive Standard: HG/T2519-1998 Molecular Formula: (NaPO3)6 MW: 611.82. Character: White powder or white granular ;the density is 2.484(20'C);It is soluble in water easily, but it isn't soluble in organic impregnant; It is a good agent for water treatment. Usage: It is usded as bonding agent, floating and selection agent, separating agent, water softener and buffer, etc. Specifications Technical Grade. Total phosphate, as P2O5% Min 68.0. Inactive phosphate, as P2O5 % Max 7.5. Fe % Max 0.05. Water insoluble % Max 0.06. PH Value of 1% water solution 5.8-7.0. Package: 25kgs woven bag lined with plastic bag, according to the customer's demand , Stored at draughty dry places.