... Grade 2.White Powder 3.SGS Quality Test before Shipping SHMP 68%,Sodium Hexametaphosphate--SGS Quality Approval Properties: White powder; ... .8-6.5SolubilitypassWater Insoluble matter % ≤0.05Polymerization9-21Fineness (mesh)60~80Application:Used in industries of oil fields, paper-making, textile ... must be stored in places well ventilated and dry. SHMP 68%,Sodium Hexametaphosphate--SGS Quality Approval