1, easy to transport 2, adequate supply, have a cheapest price 3, Professional team, top-class service PuritySpecificationRbOH min.% 99.9Impurities max.% Cl-0.005 (SO4)2-0.0013 CaO0.002 MgO0.003 K2O0.0025 Na2O0.003 Fe2O30.0001 Pb0.0001 Al2O30.0015 As0.000012 Water insoluble 0.00015