Andalusite brick Thermal shock resistant, high mechanical strength, minor high temp strength drop, strong slag resistance, high load softening temp. Used in various parts of glass melting furnaces, and in steel, non ferrous metallurgy, cement, ceramic, soaking furnaces, etc.
Andalusite refractory bricks are high - alumina fired refractory products mainly made from natural andalusite. After being fired at a high temperature of 1400 - 1650°C, they transform into mullite and silica phases, featuring excellent high - temperature performance and structural stability.
Features and Properties
| Index Items | Machine - pressed | Cast | ||
| Al₂O₃ /% | ≥ 57 | ≥ 60 | ≥ 65 | ≥ 60 |
| Fe₂O₃ /% | ≤ 1.2 | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Bulk Density /g/cm³ | ≥ 2.40 | ≥ 2.45 | ≥ 2.50 | ≥ 2.45 |
| Apparent Porosity /% | ≤ 18 | ≤ 18 | ≤ 17 | ≤ 18 |
| Compressive Strength at Normal Temperature /MPa | ≥ 70 | ≥ 70 | ≥ 70 | ≥ 60 |
| Softening Temperature under Load 0.2MPa, T0.6 /°C | ≥ 1560 | ≥ 1580 | ≥ 1650 | ≥ 1550 |
| Thermal Shock Stability (1100°C, water - cooled) / times | ≥ 25 | ≥ 20 | ≥ 15 | ≥ 25 |
| Permanent Linear Change after Heating (1450°C × 2h) /% | -0.2 ~ +0.2 | -0.2 ~ +0.2 | -0.2 ~ +0.2 | -0.2 ~ +0.2 |
Also Called:Silica Mullite Brick;
Al₂O₃:60-65%;
Bulk Density:≥2.55g/cm³;
SiO₂:≥97%;
Bulk Density:≥1.86g/cm³;
Cold Crushing Strength:≥40MPa;
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