Model

Item

Sb₂O₃ 9980

Sb₂O₃ 9950

Crystal system

Cubic crystal

Molecular weight

291.5

Mohs hardness

2-2.5

Melting point (Degree Celsius)

656

Conductivity

Poor

Boiling point (Degree Celsius)

1425

Pigmentation

High

solubility

Soluble in hydrochloric acid, tartaric acid and caustic alkali;

Insoluble in water and nitric acid

Sb₂O₃ (%)

Min 99.80

Min 99.50

As₂O₃  (%)

Max 0.05

Max 0.06

PbO (%)

Max 0.08

Max 0.10

Fe₂O₃  (%)

Max 0.005

Max 0.006

CuO (%)

Max 0.002

Max 0.002

Se (%)

Max 0.004

Max 0.005

Whiteness (%)

Min 96.0

Min 95.0

Mean particle diameter (µm)

0.3-0.9

0.3-0.9

0.9-1.6

0.9-1.6

1.6-2.5

1.6-2.5