Material Grade

K-45

K-60

K-80P

K-80

K-99

Composition

Sillimanite

Mullite

Corundum Mullite

Corundum Mullite

Recrystalised Alumina

Type according to Din-40685

----

610

----

530

710

Al₂O₃ in percentage

47

60

80 (P)

80

99

Structure

Gas-tight

Gas-tight

Porous

Gas-tight

Gas-tight

Volume Density gms/cc

2.6

2.8

2.8

3.1

3.85

Apparent Porosity %

Nil - 0.1

Nil - 0.1

20 - 22

Nil - 0.1

Nil - 0.1

Melting Point

1700 C

1800 C

1900 C

1900 C

2000 C

Limit of use

1450 C

1600 C

1750 C

1700 C

1900 C