Technical indexes: Chemical composition CdO ? 98.5% Cd ? 86% Pb < 0.002% Cu < 0.005% Tl < 0.004% Fe < 0.005% Zn < 0.001% S < 0.002% Sb < 0.002% As < 0.002% bulk density :1.4-2.3 cm3/g electrochemical capacity: 280mAH/g all passed the electric sieve of 80 screen mesh.