Item	Frist Grade	Second grade	Third grade
ZnO Dry	99.7 min	99.7 min	99.7 min
Pb	0.037max	0.06max	0.1max
Mn	0.0001max	0.0001max	0.0001max
Cu	0.0002max	0.0002max	0.0002max
Insoluble in hydrochloric acid	Insoluble in hydrochloric acid	0.01max	0.01max
Loss on ignition	0.2max	0.2max	0.2max
Screen residues(through 45 micron wet screen)	0.1max	0.1max	0.1max
volatile( 105 degree Celsius)	0.3max	0.3max	0.3max