Sodium Hexametaphosphate(SHMP) 68%: 1.CAS No.: 10124-56-8 2.Purity: 68% Min. 3.Real manufacturer 4.Packing: 25kg ... , as Fe %≤0.050.054Ph value (1% solution) %≤5.8-7.35.8-6.55SolubilityQualifiedQualified6Heavy metals, as Pb %≤ --0.0017Arsenic, as As ...