Item

Unit

Value

High Alumina

Corundum

Al2O3 Content

%

85

99～99.5

SiO2 Content

%

12

0.2

Fe2O3 Content

%

0.2

0.05～0.1

Mohs Hardness

7

8～9

Bulk Density

Injection molding

g/cm3

3.5～3.6

3.7～3.9

Extrusion molding

3.4～3.5

3.7～3.8

Hot-press molding

3.4～3.5

3.7～3.85

Water Absorption

%

0.2

0.1～0.2

Bending

Strength

Injection molding

MPa

180

200

Hot-press molding

140

150

Operating Temperature

Long term 1450

Short term 1600

Long term1600

Max. Operating Temperature

1600

1800