Item

Fused Mullite

 α-β Alumina

Chemical Composition (%)

Al2O3

73.5

94

ZrO2

8

-

Na2O

1.0

3.5

SiO2

18.5

1.5

Fe2O3

1.5

CaO

TiO2

Apparent Porosity (%)

8

--

True specific gravity (g/cm3)

3.54

3.5

Cold Crushing Strength (Mpa)

350

200

Thermal Expansion at 1150 ℃ (%)

0.8

0.9

Thermal conductivity at 500-1500 ℃  (W/MK)

4.6

--

Static corrosion 1350℃*48h

--

0.3mm/24h

Bulk density WS (g/cm3)

3.4

3.4

Crystallographic analysis (%)

Corundum

38

45

Mullite

40

-

Vitreous Phase

15

2

Baddeleyite

5

-

β Alumina

-

53