Refractory Chequers Bricks, Checker Bricks for Hot Blast Furnace

Item/Grade

Fire Clay Brick

SK-30

SK-32

SK-34

SK-35

Al₂O₃% (≥)

30

35

38

45

Fe₂O₃% (≥)

2.5

2.5

2

2

Refractoriness(SK)

30

32

34

35

Refractoriness under load,

0.2MPa, ℃ (≥)

1250

1300

1360

1420

Apparent porosity (%)

22-26

20-24

20-22

18-20

Bulk density(g/cm³))

1.9-2.0

1.95-2.1

2.1-2.2

2.15-2.22

Cold crushing strength, MPa (≥)

20

25

30

40

Item/Grade

High Alumina Brick

SK-36

SK-37

SK-38

SK-40

Al₂O₃% (≥)

55

65

70

75

Fe₂O₃% (≥)

2

2

2

2

Refractoriness(SK)

20-23

20-23

20-22

18-20

Refractoriness under load,

0.2MPa, ℃ (≥)

1250

1300

1360

1420

Operating temperature (℃ )

1400

1430

1480

1500

Bulk density(g/cm³)

2.23

2.35

2.46

2.58

Cold crushing strength, MPa (≥)

45

50

60

70

Unit weight (KG)

3.8

4.0

4.2

4.4