Product list
Insulating Firebrick
SD Tech's insulating bricks are manufactured primarily from high-purity refractory clay, with a service temperature range of 1,100°C to 1,700°C. Each product grade is designed to meet various heat treatment and processing requirements, with higher-temperature products gradually increasing the aluminum oxide (Al₂O₃) content. During the manufacturing process, organic fillers are burned to form a uniform, precise pore structure, ensuring excellent insulation and stable quality.
1. Characteristic
- Low Thermal Conductivity, Low Specific Gravity - Low thermal conductivity and low heat capacity provide excellent insulation
- High Purity, Low Impurity Content - High purity and low iron and alkaline content ensure stability even in reducing environments
- Excellent heat and pressure resistance - Excellent thermal stability allows for use in thin-walled structures
- Excellent fire resistance - High alumina content delivers outstanding fire resistance
- Excellent processability - Can be processed into various shapes and minimizes joints
2. Use
- Inner or auxiliary insulation layer of refractory material
- Suitable as refractory insulation for various industrial furnaces and heat treatment equipment, including kilns, heat treatment furnaces, flues, heating devices, regeneration devices, and decomposition furnaces
4. Specification
| Division | SD 23 | SDB 5 | SD 26 | SD 28 | SD 30 | SD 32 | |
|---|---|---|---|---|---|---|---|
| Classification temperature(℃) |
1,250 | 1,300 | 1,400 | 1,500 | 1,550 | 1,600 | |
| Density(kg/m³) | 500 | 800 | 800 | 900 | 1000 | 1100 | |
| Reheat shrinkage(℃x4h) |
0.4 (1,200) | 0.4 (1,300) | 0.5 (1,400) | 0.7 (1,500) | 0.7 (1,550) | 0.7 (1,600) | |
| Compressive strength(MPa) |
1.0 | 1.8 | 1.9 | 2.5 | 2.8 | 3.0 | |
| Breaking strength(MPa) | 0.7 | 1.2 | 1.2 | 1.4 | 1.6 | 1.8 | |
| Thermal conductivity(W/m·K) | 0.15(350℃) | 0.26(350℃) | 0.26(350℃) | 0.33(350℃) | 0.38(350℃) | 0.43(350℃) | |
| Coefficient of thermal expansion(℃) | 0.46(1,000℃) | 0.46(1,000℃) | 0.47(1,000℃) | 0.48(1,000℃) | 0.48(1,000℃) | 0.49(1,000℃) | |
| Chemical composition(%) | Al₂O₃ | 40 | 52 | 56 | 65 | 72 | 78 |
| Fe₂O₃ | 1.0 | 0.85 | 0.8 | 0.8 | 0.7 | 0.5 | |