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Item

MLJ-70

MLJ-75

MLJ-80

MgO (%) min

70

75?

80?

Al₂O₃ (%)

8-13

8-13

8-13?

Fe₂O₃(%) max

1.5

1.5

1.5

CaO(%) max

2.0

2.0

1.5

SiO₂(%) max

3

2

1.5

Refractoriness under load,

0.2MPa, Ta, (°C)

1600

1600

1650

Porosity (%) max

19

18

17

Bulk density (g/cm3) min

2.95

2.95

3.0

Cold crushing strength (MPa) min

45

45

50

Thermal Shock (1100℃water)

8

10

10