Products list
Insulating Firebrick
SDTECH Insulating Brick is manufactured using high-purity refractory clay as the primary raw material, with an operating temperature range of 1,100°C to 1,700°C. Each product grade is designed to meet the requirements of different heat treatment and process conditions, with alumina (Al₂O₃) content increasing progressively in higher-temperature grades. During manufacturing, organic fillers are burned out to form a uniform and precisely controlled pore structure, ensuring excellent insulating performance and consistent product quality.
1. Features
- Low Thermal Conductivity, Low Density: Low thermal conductivity and low heat capacity deliver excellent insulating performance
- High Purity, Low Impurity Content: High purity with low iron and alkali content ensures stability even in reducing atmospheres
- Excellent Heat and Load Resistance: Outstanding thermal stability allows use in thin-wall structures
- Excellent Refractoriness: High alumina content provides superior refractory performance
- Superior Machinability: Can be fabricated into a wide range of shapes with minimal joint gaps
2. Applications
- Inner insulation layer or backup insulation layer for refractory linings
- Suitable as refractory insulation for various industrial furnaces and heat treatment facilities, such as kilns, heat treatment furnaces, flues, heating devices, regeneration devices, and deterioration furnaces.
3. 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 | |
| Modulus of Rupture(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℃) | |
| Thermal Expansion Rate(℃) | 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 | |