Item 

X-HD

X-HS

X-HB

Al₂O₃ ≥%

53

57

65

Fe₂O₃ ≤%

1.7

0.8

0.8

TiO₂ ≤%

0.6

0.5

0.5

Alkaki≤%

0.6

0.6

0.6

Insert≤%

0.7

0.7

0.7

Alkaki+Insert≤%

1.2

1.2

1.2

Bulk density

2.3

2.35

2.4

Apparent porosity 

22

22

22

Cold crushing strength 

50

40

40

Cold modulus of rupture

12

12

15

Thermal shock resistances（1100℃）water

20

20

20

Liner change after heating

1400×2h

1400×2h

1450×2h

Average 

-0.2~0.2

-0.2~0.2

-0.2~0.2

Creep 

1300℃ 0.2

1400℃ 0.2

1450℃ 0.2

Refractoriness under load
0.5%≥℃
2.0%≥℃
5.0%≥℃

1350
1490
1560

1470
1580
1600

1520
1630
1650