Index name

Value

Quality index

HG/T 2572-94

First grade

Qualified product

Zinc oxide (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, %

0.02

0.05

PbO(as pb), %≤

0.01

0.05

Manganese oxide (as Mn), %≤

0.001

0.003

CuO(as Cu), %≤ 

0.001

0.003

Fineness (45μm test sieve Residue on screen ), %≤

0.1

0.4

Specific surface area ,m2/g ≥

45

35

Bulk density ,g/ml ≤

0.35

0.40