Chemical (%)

Magnesium brick

Mg-Chrysolite Brick

Alumina brick

Andalusite brick

Fireclay brick

High alumina cast material

Insulation fireclay brick

VERMICULITE BOARD

Fiber wall material

Ceramic Fiberboard

SiO2

2-3

42

13

38

60

30

60

37

30

52

Al2O3

<0.5

0.8

81

58

35

62

35

7.0

9.0

48

TiO2

<0.2

3-4

<1

<2.0

0.6

Fe2O3

2-3

6.0

1-2

1.5

<3.0

0.8

1.7

5.6

3.0

CaO

<0.3

0.2

0.3

<0.4

<0.5

1.4

0.5

1.2

45

MgO

88-91

49

0.3

<0.3

<0.5

26

5

Na2O

<0.1

0.1

<0.2

<1.0

<0.7

0.2

K2O

<0.5

<0.1

0.4

<0.5

<1.5

<1.5

1.2

2.6(+Na2O)

P2O5

11

Loss of ignition

7.5

6.0

X ray

Periclase,

Mg-Chrysolite etc

Mg-Chrysolite

Corundum,

Mullite etc

Andalusite,

mullite

quartz

Mullite,

quartz

Mullite

quartz

Vermiculite

phlogopite

Calcite,

C3S

C2S

Glass phrase

Density g/cm3

2.9

2.6

2.8

2.5

2.0-2.2

2.6

0.8

1.4

0.6

0.24

Open porosity %

17-19

19-21

22

18

15-19

45

Cold crushing strength Mpa

80

35

60

60

50

70

1-3

6

<1

Thermal conductivity W/m.K

300°C

8.4

1.3

2.2

1.9

1.2

0.28

0.24

0.20

0.07

600°C

6.3

1.3

2.3

1.8

1.3

1.7

0.35

0.31

0.25

0.12

1000°C

4.0

1.3

2.4

1.7

1.4

0.45

0.30

0.22