Content(%) Grade A(%) Grade B(%) Co ¡Ý21 ¡Ý20.5 Ni 0.0008 0.001 Fe 0.0005 0.001 Cu 0.0003 0.001 Mn 0.0005 0.001 Zn 0.0003 0.001 Ca 0.001 0.002 Mg 0.001 0.001 Na 0.0015 0.002 Pb 0.001 0.001 As 0.001 0.001 Cl- 0.01 0.02 Si 0.0025 0.01 Insol. In water 0.01 0.02. In knitted bag, inside with plastic sealed package, 25kg/bag palleted.