High-Alumina Insulating Bricks

High-alumina insulating bricks are manufactured through a specialized process involving the selection of high-alumina raw materials, the incorporation of composite pore-forming agents and binders, followed by shaping and high-temperature firing. Their performance advantage lies in effectively combining high refractory properties with lightweight insulating characteristics:

- Elevated Service Temperature: With a high Al₂O₃ content (typically 48%-65%), their refractoriness and load-bearing softening temperature significantly exceed those of clay insulating bricks, making them suitable for more demanding high-temperature environments.

- Superior Thermal Insulation: A uniformly distributed closed-cell pore structure provides a low thermal conductivity, effectively blocking heat flow and reducing heat loss from furnace structures.

Good high-temperature volume stability: Thoroughly fired with minimal linear change upon re-firing, ensuring structural integrity of the insulation lining during long-term use.

Moderate mechanical strength: At equivalent densities, it offers superior compressive strength and abrasion resistance compared to clay insulating bricks, meeting mechanical requirements during installation and operation.

Key Technical Specifications:

- Al₂O₃ content: 48% - 65% (series-based)

- Bulk density: 0.8 g/cm³ - 1.5 g/cm³ (series-specific)

- Compressive strength at ambient temperature: ≥ 2.5 MPa - 10.0 MPa (increases with density)

- Thermal Conductivity (Average Temperature 350±25℃): 0.20 W/(m·K) - 0.45 W/(m·K)

- Linear Change on Re-firing: ≤ 2% (Maintained at specified temperature for 8 hours)

- Maximum Service Temperature: 1300℃ - 1550℃ (Graded)

High-alumina insulating bricks are suitable for thermal insulation layers in various industrial furnaces and thermal equipment operating at elevated temperatures while requiring excellent thermal retention:

1. Metallurgical Industry: Permanent layers and backing insulation for ladles, tundishes, heat treatment furnaces, rolling mill reheating furnaces, and electric arc furnaces.
2. Ceramics and Building Materials Industry: High-temperature insulation layers for ceramic roller kilns, tunnel kilns, shuttle kilns, and insulation layers beneath refractory linings of kiln cars.
3. Petrochemical Industry: Insulation linings for furnace walls of tubular furnaces such as ethylene cracking furnaces, hydrogen production conversion furnaces, and steam reforming furnaces.
4. Mechanical Casting Industry: Thermal insulation linings for annealing furnaces, bogie-hearth heat treatment furnaces, and non-ferrous metal melting furnaces.
5. Glass Industry: Thermal backing insulation for high-temperature zones such as working pools and upper sections of regenerative chambers in glass melting furnaces.
6. Other Industrial Fields: Thermal insulation for equipment including carbon calcining furnaces and secondary combustion chambers in waste incinerators.

Zhengzhou Chaoyu Refractories Co., Ltd. provides professional high-alumina insulating brick product selection and energy-saving solutions for customers:

Complete Product Range Supply: We offer a full series of high-alumina insulating bricks with operating temperatures ranging from 1300°C to 1550°C and multiple density grades to meet diverse insulation design requirements.
Precision Technical Selection: Based on the specific operating temperature, hot-face material, and allowable heat loss of the customer's kiln, we recommend the most cost-effective combination of insulation layer thickness and material grade.
Customized Processing Services: We offer pre-formed processing such as irregular cutting, curved bricks, and composite bricks to simplify on-site construction and enhance masonry quality.
Rigorous Quality Assurance: Product performance complies with GB/T 3995-2014 and other relevant standards, undergoing stringent factory inspections to ensure stable and reliable performance.
Energy-Saving Calculations & Technical Support: We provide theoretical heat loss calculations, masonry structure optimization recommendations, and construction guidance to help achieve optimal energy efficiency.
Reliable Global Supply: With stable production capacity and comprehensive export packaging/logistics solutions, we ensure safe and timely delivery to customers worldwide.

If you require upgraded insulation solutions for high-temperature kilns or seek detailed technical specifications and samples of high-alumina insulating bricks, please contact us via our official website or reach out to our sales engineers. Zhengzhou Chaoyu Refractories Co., Ltd. leverages professional product expertise and extensive application experience to deliver exceptional insulation material selections and comprehensive energy-saving technical services.