Project
Indicators

RH-21

RH22

RH23

RH231

RH24

RH25

RH70

RH72

AL2O3 %

≥75

≥80

≥65

≥65

≥65

≥65

≥70

≥72

Fe2O3 %

≤1.0

≤1.0

≤1.2

≤1.2

≤1.5

≤1.8

≤1.5

≤1.0

Apparent
 porosity %

≤21

≤21

≤21

≤20

≤22

≤22

≤22

≤24

bulk density
 ,g/cm3

≥2.70

≥2.75

≥2.60

≥2.60

≥2.50

≥2.45

≥2.5

≥2.70

Normal temperature
compressive
strength ， MPa

≥70

≥70

≥ 65

≥65

≥60

≥60

≥60

≥50

0.2MPa load
 softening
 start temperature ℃

≥1700

≥1700

≥1650

≥1650

≥1600

≥1550

≥1600

≥1550

Change rate of
reheating line（ % ）

1550℃×4h

± 0.2

1550℃×4h

± 0.2

1550℃×4h

± 0.2

1450℃×3h

± 0.2

1450℃×3h

± 0.2

1450℃×3h

± 0.2

1500℃×3h

± 0.2

1500℃×4h

± 0.2

Creep rate
(0.2MPa),%

1550℃×50h ≤ 0.8

1500℃×50h ≤ 0.8

1450℃×50h ≤ 0.8

1450℃×50h ≤ 0.8

1400℃×50h ≤ 0.8

1350℃×50h ≤ 0.8

/

1550℃×50h ≤ 0.8

Thermal shock
 stability

≥15

≥15

≥15

≥30

≥15

≥15

≥25

≥40

Note: the thermal shock stability index can be adjusted according to the user's requirements