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Physical and chemical indexes
Brand
Index
LZ-75
LZ-65
LZ-55
LZ-48
Al2O3 % ≥
75
65
55
48
Crushing strength Mpa ≥
54
49
44
40
Apparent porosity ≤
23
22
Refractoriness under load ≥
1520
1500
1470
1420
Reheating linear change %
0.1-0.4
℃Refractoriness ≥
1790
1770
1750
N-1
N-2a
N-2b
N-3a
N-3b
N-4
N-5
N-6
Refractoriness ℃ ≥
1730
1710
1690
1670
1580
1400
1350
1320
1300
1400℃,2h
0.1-0.5
0.2-0.5
1350℃,2h
24
26
28
CCS Mpa ≥
30
25
20
15
Key words :