70 alumina fire brick mainly refers to 70% alumina fire bricks, they are high-performance refractory materials with excellent resistance to high temperatures, corrosion, and mechanical wear. They are widely used in metallurgy, cement, petrochemical, and glass industries.
Technical Parameters of Xintai 70 Refractory Brick
| Property | Value | Property | Value |
|---|---|---|---|
| Al₂O₃ | 70.00 – 72.00 % | SiO₂ | 22.00 – 24.00 % |
| TiO₂ | 2.80 – 3.00 % | Fe₂O₃ | 1.50 – 1.60 % |
| CaO | 0.20 – 0.30 % | MgO | 0.10 – 0.20 % |
| Na₂O + K₂O | 0.30 – 0.50 % | Bulk Density | 2.60 – 2.65 g/cm³ |
| Apparent Porosity | 18 – 20 % | Modulus of Rupture | 100 – 120 kg/cm² |
| Cold Crushing Strength | 550 – 650 kg/cm² | Thermal Expansion at 1300°C | 0.75 – 0.80 % |
| Thermal Conductivity at 400°C | 1.45 – 1.50 W/m·K | at 700°C | 1.50 – 1.55 W/m·K |
| at 1000°C | 1.65 – 1.70 W/m·K | Refractoriness | 1825 – 1850 °C |
| R.U.L. (Ta) | >1530 °C | Service Temp | 1700 °C |
Product Features
- High Alumina Content (≥70%): Made from premium-grade calcined bauxite, with Al₂O₃ content between 70% and 72%, ensuring excellent refractory properties.
- High Refractoriness (1825–1850°C): Suitable for continuous high-temperature environments; ideal for lining in steel, cement, and non-ferrous metal industries.
- Excellent Resistance to Slag and Erosion: Outstanding chemical resistance to acidic and basic slags, making it ideal for areas with high corrosion and erosion.
- Superior Thermal Shock Resistance: Withstands rapid temperature fluctuations without cracking or spalling, extending the service life of the furnace lining.
- High Mechanical Strength: Cold crushing strength ranges from 550 to 650 kg/cm², ensuring structural integrity under mechanical and thermal loads.
- Precision in Dimensions and Easy Installation: Precisely formed and sintered at high temperatures for stable dimensions, ensuring quick and reliable masonry.
