Item

Value

Top-grade

First grade

Qualified product

Top-grade

First grade

Qualified product

Zinc oxide (as dry )% ≥

99.70

99.50

99.40

99.70

99.50

99.40

Metals (as Zn)% ≤

no

no

0.008

no

no

0.008

PbO(as Pb)% ≤

0.037

0.05

0.14

-

-

-

Oxide of manganese(Mn)% ≤

0.0001

0.0001

0.0003

-

-

-

CuO(Cu)% ≤

0.0002

0.0004

0.0007

-

-

-

Insoluble matter in HCl% ≤

0.006

0.008

0.05

-

-

-

Loss on ignition % ≤

0.2

0.2

0.2

-

-

-

Residue on screen
(45um mesh )% ≤

0.1

0.15

0.2

0.1

0.15

0.2

Water soluble matter % ≤

0.1

0.1

0.15

0.1

0.1

0.15

Volatile matter on 105℃ % ≤

0.3

0.4

0.5

0.3

0.4

0.5

Oil adsorption g /100g ≤

-

-

-

14

14

14

Color( compared with standard)

-

-

-

similar

slight

light

Decolor capacity
( compared with standard) ≥

-

-

-

100

95

90