NN—30

NN—38

NN—42

NN—45A

NN—45B

(℃) Refractoriness (℃ ) not less than

1630

1690

1710

1730

1730

Al2O3（%） Al2O3（%）not less than

30

38

42

45

45

（MPa）

Cold flexural bond strength

(MPa)

110℃

After drying at 110℃ , Not less than

1.0

1.0

1.0

1.0

2.0

1200℃ ×3h

After firing at 1200℃ ×3h, Not less than

3.0

3.0

3.0

3.0

6.0

0.2MPa Ti/℃

0.2MPa refractoriness under load Ti/℃ not less than

—

1200

（%）

Linear change rate (%)

1200℃ ×3h After firing at 1200℃ ×3h

+1 ～ -3

—

1300℃ ×3h After firing at 1300℃ ×3h

—

+1 ～ -5

（min） Bonding time (min)

1 ～ 3

（%）

Granularity (%)

-1.0 ㎜

100

+0.5 ㎜ +0.5mm Not greater than

2

-0.074 ㎜ -0.074mm Not less than

50