First grade

Qualified product

ZnO /%

95～98

95～98

Moisture /%

0.7

0.7

Water soluble matter/%

0.5

0.7

Loss on ignition/%

1～4

1～4

Insoluble matter in HCl/%

0.04

0.05

Lead oxide (as Pb) %

0.01

0.05

Manganese oxide (as Mn) %

0.001

0.003

Copper oxide (as Cu) %

0.001

0.003

Fineness (residue on 45μm sieve)

0.1

0.4

Specific surface area m²/g

45

35

Bulk Density g/cm³

0.35

0.40