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High alumina hollow ball brick description
The main raw material of high alumina hollow ball brick is alumina hollow ball, which belongs to heat insulation refractory material, combined with other bonding agents, after 1750 degrees of high temperature firing.
High alumina hollow ball brick advantages
- High porosity, generally can reach 40%-85%
- The volume density is low, generally less than 1.5g/cm3
- Low thermal conductivity, generally less than 1.0W (m·K)
- Save energy
More relevant refractory products: Ceramic fiber tube
High alumina hollow ball brick index
| Index | Level I | Level II | Level III |
| Al2O3, % | ≥98 | ≥98 | ≥98 |
| SiO2, % | ≤1 | ≤1 | ≤1 |
| Fe2O3, % | ≤0.7 | ≤0.7 | ≤0.7 |
| Refractoriness under load, ℃ | ≥1790 | ≥1790 | ≥1790 |
| Refractorines under load, 0.1MPa, ℃ | ≥1600 | ≥1600 | ≥1600 |
| Bulk density, g/cm3, ≤ | 1.2 | 1.4 | 1.6 |
| True porosity, %, ≥ | 62 | 60 | 58 |
| Cold crushing strength, MPa, ≥ | 3 | 10 | 12 |
| Thermal Conductvity, 1100℃, W.(m.k), ≤ | 0.93 | 1.04 | 1.16 |
High alumina hollow ball brick application
High alumina hollow ball brick has been widely used in high and ultra-high temperature kilns such as gasifier in petrochemical industry, carbon black industrial reactor and induction furnace in metallurgical industry, and has shown excellent energy saving effect.