Items

Common

High strength

Insulating

Arch roof

Al2O3,%

25~40

25~40

25~40

25~40

SiO2,%

60~70

60~70

60~70

60~70

Fe2O3,%

≤2

≤2

≤2

≤2

Bulk density,g/cm3

≥2.1

≥2.2

≥1.65

≥2.2

Apparent porosity,%

≤21

≤20

≤30

≤21

Refractoriness under load,℃

≥1300

≥1250

≥1250

≥1350

Cold compressive strength,Mpa

≥25

≥60

≥15

≥30

Thermal conductivity,w/m.k

≤1.28

≤1.28

≤0.7

≤1.28

Thermal shock rsistance(1100℃,water cooling)

≥10

≥15

≥5

≥10