75 High Alumina Fire Bricks are high-performance refractory bricks manufactured from carefully selected high-grade bauxite and advanced refractory production technology. With an Al₂O₃ content of 75–77%, these bricks provide excellent refractoriness, high mechanical strength, good thermal shock resistance, and strong resistance to chemical corrosion.
Designed for demanding high-temperature industrial environments, 75 alumina fire bricks maintain structural stability and reliable performance under continuous thermal and mechanical stress. Their high alumina composition makes them suitable for furnace linings exposed to high temperatures, slag, molten materials, abrasion, and repeated heating and cooling cycles.
Compared with conventional fire clay bricks, 75% alumina fire bricks offer higher refractoriness and superior load-bearing performance. They are widely used in steelmaking, cement production, lime processing, glass manufacturing, non-ferrous metal processing, waste treatment, and other industries requiring durable refractory linings.
Physicochemical Parameters
| Items | SK-40 | SK-38 | SK-37 | SK-36 | SK-35 |
|---|---|---|---|---|---|
| AI₂O₃ ≥ , % | 80 | 75 | 65 | 55 | 48 |
| Bulk density, g/cm³ | 2.7-2.8 | 2.4-2.65 | 2.3-2.35 | 2.25-2.3 | 2.1-2.2 |
| Apparent Porosity, % | 20-22 | 20-22 | 23-24 | 23-24 | 23-26 |
| Cold crushing strength, Mpa | 65 | 55 | 50 | 45 | 40 |
| Refractoriness, ℃ | 1790 | 1790 | 1790 | 1770 | 1750 |
| Refractoriness under loading, 0.2MPa | 1600 | 1520 | 1480 | 1450 | 1420 |
| Permanent liner change of Reheating, % 1500℃, 2h |
-0.4~0.1 | -0.4~0.1 | -0.4~0.1 | -0.4~0.1 | -0.4~0.1 |
Product Features
- High Refractoriness: 75 High Alumina Fire Bricks are designed for high-temperature applications and can withstand working temperatures of up to approximately 1750°C. The high Al₂O₃ content provides excellent resistance to softening, deformation, and melting under demanding thermal conditions.
- High Mechanical Strength: With a cold crushing strength of approximately 65–80 MPa, these refractory bricks can withstand significant mechanical loads, impact, and pressure inside industrial furnaces. This makes them suitable for furnace areas exposed to heavy structural and operational stress.
- Excellent Slag and Chemical Resistance: The high alumina composition provides good resistance to chemical attack from molten slag, furnace gases, and other aggressive substances. This helps reduce refractory wear and contributes to longer lining service life.
- Good Thermal Shock Resistance: 75 alumina bricks can withstand repeated heating and cooling cycles with reduced risk of cracking and spalling. Their thermal stability makes them suitable for furnaces operating under frequent temperature changes.
- Good Volume Stability: These bricks maintain relatively stable dimensions during high-temperature operation, helping minimize deformation and maintain the integrity of the refractory lining over extended service periods.
- Abrasion Resistance: The dense structure and high mechanical strength provide good resistance to abrasion caused by raw materials, dust, solid particles, and material movement inside industrial furnaces and kilns.
- Customized Manufacturing: In addition to standard 230×114×65 mm bricks, customized dimensions and special shapes can be manufactured according to furnace drawings, installation requirements, and operating conditions.
Applications
75 High Alumina Fire Bricks are suitable for high-temperature zones in:
- Steel Ladles: Ladle linings and high-temperature areas requiring high mechanical strength and resistance to molten steel and slag erosion
- Soaking Pits: Furnace linings exposed to high temperatures, thermal cycling, and mechanical stress during steel heating processes
- Reheating Furnaces: Furnace walls and high-temperature zones requiring excellent refractoriness, thermal stability, and long service life
- Electric Arc Furnaces (EAF): Selected furnace areas requiring high-temperature resistance, mechanical strength, and resistance to thermal and chemical attack
- Cement Rotary Kilns: High-temperature and wear-prone zones exposed to heat, abrasion, and chemical erosion during cement production
- Lime Kilns: Kiln linings exposed to high temperatures, abrasion, and prolonged thermal cycling during lime production
- Glass Furnaces: Furnace structures and high-temperature areas requiring resistance to heat and chemical erosion
- Industrial Furnaces: Heat treatment, calcining, soaking, annealing, and other high-temperature processing furnaces requiring durable refractory linings
- Waste Incinerators: Selected lining areas exposed to high temperatures, thermal cycling, and aggressive combustion environments
- Gasifiers: High-temperature lining areas requiring good thermal stability and resistance to chemical attack
Ideal for industrial furnace and kiln linings requiring high refractoriness, mechanical strength, thermal shock resistance, chemical stability, and long-term performance under demanding high-temperature operating conditions.
Customization Services
Xintai Refractory provides customized refractory solutions based on different industrial furnace requirements:
Sizes
Custom dimensions are available according to furnace designs and installation requirements.
Shapes
Manufacturing options include:
- Standard straight bricks
- Arch bricks
- Wedge bricks
- Checker bricks
- Special-shaped refractory bricks
Material Options
Different alumina grades and formulations can be customized according to operating temperatures and working conditions.
Packaging Solutions
Customized export packaging solutions are available for safe transportation.
Packing and Shipping Details
75 High Alumina Fire Bricks are carefully packed for safe international transportation.
- Packaging: Fumigated wooden pallets, polyethylene film, shrink wrap, and protective materials
- Loading: Optimized pallet loading according to container requirements
- Shipping: Sea freight, air freight, or land transportation
- Lead Time: Approximately 7–15 days depending on order quantity and customization
- Sample: Samples available for quality evaluation
- Export Service: Professional export packaging and documentation support
About Xintai Refractory
Xintai Refractory is a professional refractory manufacturer with more than 20 years of industry experience. The company specializes in high alumina bricks, fire clay bricks, insulating bricks, refractory castables, ramming masses, and other refractory products.
With advanced production technology, strict quality control, professional technical support, and customized manufacturing capabilities, Xintai Refractory supplies refractory solutions for steel, cement, glass, lime, ceramics, petrochemical, non-ferrous metal, waste treatment, and other high-temperature industries.
For 75 High Alumina Fire Bricks with consistent quality, customized specifications, and reliable export service, contact Xintai Refractory for a technical consultation and free quotation.
