Project requirements dry hydrate type I type II type III type I type II type III tin dioxide (calculated as Sn) w/% ≥ 60.0 50.0 40.0 28.0 23.0 13.0 Moisture w/% ≤ 0.3 0.5 0.8 35.0 45.0 50.0 Lead (Pb )/(mg/kg) ≤ 300 300 300 50 100 100 Arsenic (As)/(mg/kg) ≤ 100 100 100 20 30 30