Name

Superfine Particle

Fine Particle

Medium-size Particle

Medium-size and Coarse Particle

Coarse Particle

WO3-Fsss

≤5um

9-16um

16-19um

19-22um

≥22um

WO3-Loose Density

≤2.0g/cm³

2.3-2.9g/cm³

2.7-3.1 g/cm³

2.9-3.3 g/cm³

≥3.0 g/cm³

WO2.9-Fsss

≤5um

8-12um

12-16um

WO2.9-Loose Density

≤1.8g/cm³

1.8-2.4g/cm³

2.3-2.8 g/cm3

Note: According to contract terms, the supplier should adjust Fsss at the range of Table 2 to meet the requirements of the demander.

The content of WO3 is not less than (%)

99.9

Class

Typical Value

Maximum Value

Class

Typical Value

Maximum Value

Based on WO3, the content of impurities is not more than (%)

Al

0.0005

0.0010

Based on WO3, the content of impurities is not more than (%)

Mo

0.0015

0.0050

As

0.0007

0.0010

Na

0.0005

0.0015

Bi

0.0001

0.0002

Ni

0.0005

0.0020

Ca

0.0007

0.0020

P

0.0007

0.0015

Cd

0.0001

0.0002

Pb

0.0001

0.0002

Cr

0.0005

0.0020

S

0.0005

0.0010

Co

0.0005

0.0010

Sb

0.0002

0.0010

Cu

0.0002

0.0005

Si

0.0008

0.0020

Fe

0.0010

0.0040

Ti

0.0005

0.0010

K

0.0005

0.0015

Sn

0.0001

0.0005

Mg

0.0005

0.0010

V

0.0005

0.0020

Mn

0.0005

0.0010

 Note: The chemical elements such as K and Na can be adjusted according to the requirements of the contract.