TECHNICAL DOC---Typical Data Comparison of vermiculite brick with other refractories

Chemical (%)

Magnesium brick

Alumina brick

Fireclay brick

Insulation fireclay brick

VERMICULITE BOARD

Ceramic Fiberboard

SiO2

2-3

13

60

60

37

52

Al2O3

<0.5

81

35

35

7.0

48

TiO2

3-4

<2.0

0.6

Fe2O3

2-3

1-2

<3.0

1.7

5.6

CaO

<0.3

0.3

<0.5

0.5

1.2

MgO

88-91

0.3

<0.5

26

Na2O

0.1

<1.0

<0.7

0.2

K2O

<0.5

0.4

<1.5

<1.5

1.2

P2O5

11

Loss of ignition

7.5

X ray

Periclase,

Mg-Chrysolite etc

Corundum,

Mullite etc

Mullite,

quartz

Mullite

quartz

Vermiculite

phlogopite

Glass phrase

Density g/cm3

2.9

2.8

2.0-2.2

0.8

1.4

0.24

Open porosity %

17-19

22

15-19

45

Cold crushing strength Mpa

80

60

50

1-3

6

<1

Thermal conductivity W/m.K

300°C

8.4

2.2

1.2

0.28

0.24

0.07

600°C

6.3

2.3

1.3

0.35

0.31

0.12

1000°C

4.0

2.4

1.4

0.45

0.22