
item First grade Second grade Third grade ZnO dry 99.7min 99.7min 99.7min Pb 0.037max 0.06max 0.1max Mn 0.0001max 0.0001max 0.0001max Cu 0.0002max 0.0002max 0.0002max Loss on ignition 0.2max 0.2max 0.2max volatile( 105 degree Celsius) 0.3max 0.3max 0.3max