X-H21

X-H22

X-H23

X-H24

X-H26

X-H27

X-231

X-HSPCD

Al₂O₃ ≥%

75

80

65

65

60

50

65

50

Fe₂O₃ ≤%

1．00

1．00

1．00

1．00

1．00

1．00

1．00

2．00

Apparent porosity 

20

21

19

23

23

23

20

24

Bulk density 

2．60

2．65

2．45

2．40

2．30

2．20

2．1

2．1

Cold crushing strength ≥MPa

55

45

55

45

40

40

60

35

Refracoriness ≥℃

1850

1850

1850

1820

1790

1770

1790

Linear change after heating（3h）

(1550℃) 0.2

(1550℃)
0.2

(1450℃) 0.2

(1400℃)
0.2

(1300℃)
0.2

(1270℃)
0.2

(1450℃)
0.2

Creep 0.2Mpa(50h) ≤%

(1450℃) 0.8

(1450℃) 0.8

(1450℃) 1.0

(1400℃)
0.8

(1300℃)
0.8

(1270℃)
0.8

(1450℃)
0.7