Tb4O7 99.9% 1.Tb4O7 99.9%, REO 99.0% 2.REO Impurity Max 0.1% 3.Other Impurity Fe2O3 0.002%, SiO2 0.005%, CaO 0.002%, Cl- 0.02% Tb4O7 99.99% 1.Tb4O7 99.99%, REO 99.0% 2.REO Impurity Max 0.01% 3.Other Impurity Fe2O3 0.0002%, SiO2 0.002%, CaO 0.0005%, Cl- 0.005% Packing 10/25kgs in vacuum plastic bag