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The lightweight mullite insulating castable series is a high-performance thermal insulation refractory material formulated with lightweight mullite clinker as the main raw material, combined with high-purity ultrafine powders, high-temperature binders, and foaming agents. Its key characteristics lie in the combination of the high refractoriness and excellent high-temperature volume stability of the mullite phase with the low thermal conductivity advantages of lightweight materials.
Its thermal conductivity is significantly lower than that of conventional lightweight insulating castable, providing more durable and effective thermal insulation performance. The material also exhibits excellent thermal shock resistance and strong resistance to pulverization, maintaining a stable structure during high-temperature service and being resistant to deformation and cracking. It offers flexible installation methods and can be cast or applied by coating, with uniform strength development after curing, making it suitable for higher-temperature insulation applications.
This series of materials is widely used in high-temperature industrial fields such as metallurgy, building materials, and petrochemicals.
In the metallurgical industry, it is used as the insulation layer of regenerators in blast furnace hot blast stoves and as the backup lining of electric furnace roofs.
In the building materials industry, it is suitable for insulation layers of glass furnace tank walls and insulation linings in the transition zones of cement rotary kilns.
In the petrochemical industry, it is applied to insulation layers of cracking furnaces and reforming furnaces.
In addition, it can also be used in insulation structures of aerospace test furnaces and special high-temperature heat treatment furnaces, meeting high-efficiency energy-saving requirements under medium- and high-temperature operating conditions.
Index | Unit | lightweight mullite insulating castable series | |||||||
CT Mul-1.0 | CT Mul-1.1 | CT Mul-1.2 | CT Mul-1.3 | CT Mul-1.5 | CT Mul-1.8 | CT Mul-2.0 | |||
Al2O₃ | % | ≥35 | ≥35 | ≥40 | ≥40 | ≥45 | ≥50 | ≥55 | |
Fe2O3 | % | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 | ≤1.5 | ≤1.5 | |
Bulk density ≥ | g/cm³ | 1.0±0.1 | 1.1±0.1 | 1.2±0.1 | 1.3±0.1 | 1.5±0.1 | 1.8±0.1 | 2.0±0.1 | |
Cold crushing strength ≥ | 110℃*24h | MPa | ≥2.5 | ≥3.5 | ≥4.0 | ≥5.0 | ≥6.0 | ≥10.0 | ≥15.0 |
1100℃*3h | ≥2.5 | ≥3.5 | ≥4.0 | ≥5.0 | ≥10.0 | ≥12.0 | ≥20.0 | ||
1350℃*3h | _ | _ | _ | _ | ≥10.0 | ≥12.0 | ≥20.0 | ||
Reheating linear change | 1100℃*3h | % | -1.0~0 | -1.0~0 | -1.0~0 | -1.0~0 | -1.0~0 | _ | _ |
1350℃*3h | _ | _ | _ | _ | _ | ±0.5 | ±0.5 | ||
Thermal Conductivity | At 400℃ | W/m.k | ≤0.30 | ≤0.30 | ≤0.30 | ≤0.40 | ≤0.45 | ≤0.65 | ≤0.70 |
At 600℃ | ≤0.35 | ≤0.40 | ≤0.40 | ≤0.45 | ≤0.50 | ≤0.70 | ≤0.75 | ||
Recommended Maximum Service Temperature | ℃ | 1250 | 1250 | 1250 | 1300 | 1350 | 1350 | 1400 | |
Application Method | Casting/ing/guning | ||||||||
