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Mullite Insulating Firebricks
Mullite Insulating Firebricks
Mullite insulating firebricks 23,26,28,30 grade and B5,B6 B7series are typical insulation products, these products are completely manufactured according to the ASTM standard, they are widely used as industrial furnace linings of the glass industries, ceramics industries, metallurgical industry, petroleum chemical industry, iron & steel industries.
Characteristics of mullite insulating firebricks:
Low thermal conductivity Good thermal shock stability
High mechanical strength High dimensional accuracy
Uniform structure Easy handling and installation
Except standard bricks 230x114x64, 230x114x76, 250x124x76 etc, it can be processed into wedge, arch, and split series.
|
Index |
23 |
26 B |
26 A |
28 |
30 |
||
|
Safety application temp. |
1260 |
1260 |
1300 |
1430 |
1500 |
1550 |
|
|
Bulk density g/cm3 |
0.5 |
0.6 |
0.8 |
0.8 |
0.9 |
1.0 |
|
|
Crushing strength MPa ≥ |
1.0 |
1.1 |
1.8 |
2.0 |
2.5 |
2.8 |
|
|
Reheat linear change |
1200℃×24h |
1230℃×24h |
1300℃×24h |
1430℃×24h |
1500℃×24h |
1550℃×24h |
|
|
% ≤ |
-0.4 |
-0.4 |
-0.4 |
-0.5 |
-0.7 |
-0.7 |
|
|
Reversible thermal expansion 1000℃%≤ |
0.46 |
0.46 |
0.46 |
0.47 |
0.48 |
0.48 |
|
|
Thermal conductivity w/m.k |
350℃ |
0.15 |
0.15 |
0.26 |
0.26 |
0.33 |
0.41 |
|
Al2O3 % ≥ |
40 |
40 |
52 |
56 |
65 |
72 |
|
|
Fe2O3 % ≤ |
1.0 |
1.0 |
0.85 |
0.80 |
0.8 |
0.7 |
|