Index Tech Grade, %
COSO4.7H2O ≥ 97
Fe ≤ 0.05
Zn ≤ 0.03
Ni ≤ 0.8
Ca ≤ 0.002
Na ≤ 0.0006
Cd ≤ 0.001
Cu ≤ 0.02
Furthermore, we can supply the other index ones according to your satisfication.