Name

Common

High strength

Insulating

Arch brick

Al 2 O 3 (%) ，≤

30

30

30

30

SiO 2 (%),

60-70

60-70

60-70

60-70

Fe 2 O 3 (%), ≤

2.0

2.0

2.0

2.0

Bulk density (g/cm 3 ) ,

≥ 2.10

≥ 2.20

≤ 1.65

≥ 2.20

Apparent porosity (%) , ≤

21

20

30

21

Cold crushing strength (MPa), ≥

30

60

25

30

Refractoriness Under Load 0.2 MPa(℃), ≥

1390

1350

1310

1430

Thermal expansion (900℃,% ) ≤

0.7

0.7

0.6

0.6

Thermal conductivity (350±25℃)w/m·k ≤

1.28

1.28

0.7

1.20

Thermal shock resistance,(1100℃/water cooling) , ≥

10

25

5

10