Clay insulating brick (also known as insulating fireclay brick) is a highly efficient, lightweight refractory material engineered for exceptional thermal management. Featuring a specialized porous structure, it delivers incredibly low thermal conductivity and reliable structural stability. It serves as an ideal non-load-bearing insulation lining across metallurgical, chemical, and ceramic industries, ensuring consistent furnace temperatures and extending equipment lifespan.
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- Al2O3: ≥20%;
- SiO2: ≤70%;
- Bulk Density: ≤0.8g/cm³;
- Thermal Conductivity: 0.35W/(m·K);
- Cold Crushing Strength: ≥2.5MPa;
- Size: 230*114*65mm (standard)/And other sizes;
- Delivery: 15-30 Working Days;
- Price: Low EX-factory price;
Specifications of Kerui Clay Insulating Brick
Kerui Refractory offers multiple grades of clay insulating bricks. The main differences between these types lie in their bulk density, thermal conductivity, and permanent linear change under different high-temperature conditions. Please choose the appropriate insulating bricks based on the specific physical and thermal requirements of your kiln or furnace.
| Item/Grade | NG135-1.3 | NG135-1.2 | NG130-1.0 | NG125-0.8 | NG120-0.6 | |
|---|---|---|---|---|---|---|
| Bulk Density, g/cm³ | ≤ | 1.3 | 1.2 | 1 | 0.8 | 0.6 |
| Cold Crushing Strength, MPa | ≥ | 5 | 4.5 | 3.5 | 2.5 | 1.3 |
| / | 4.5 | 4 | 3 | 2 | 1 | |
| Permanent Linear Change, % | Experimental Conditions | 1350°C*12h | 1300°C*12h | 1250°C*12h | 1200°C*12h | |
| Xmin~Xmax | -2~1 | -2~1 | ||||
| Thermal Conductivity Coefficient, W/(m·K) ≤Average Temperature (350±25°C) | ≤ | 0.55 | 0.5 | 0.4 | 0.35 | 0.25 |
Introduction of Kerui Clay Insulating Brick
Clay insulating brick is a lightweight refractory material known for its low thermal conductivity and high porosity. Manufactured by adding combustible materials to fireclay, it forms a cellular internal structure during firing that effectively minimizes heat transfer. Operating safely between 1200°C and 1350°C, it serves as an ideal backup insulation layer in industrial furnaces to reduce energy consumption and improve overall thermal efficiency.
Advantages of Kerui Clay Insulating Brick
- Low Thermal Conductivity The cellular internal structure of clay insulating bricks traps air, significantly reducing thermal conductivity. When installed as a backup insulation layer, this mechanism effectively minimizes heat transfer. It lowers outer shell temperatures, reduces fuel consumption, and improves the overall energy efficiency of continuous operating industrial furnaces.
- Lightweight Structure Featuring a precisely controlled bulk density ranging from 0.6 to 1.3 g/cm³, these lightweight refractory bricks significantly reduce the overall structural weight of kiln linings. This lower density ensures reduced heat storage capacity, allowing for faster heating cycles while minimizing structural stress on the furnace framework.
- High Volume Stability Manufactured from selected fireclay grog and fired at elevated temperatures, these bricks exhibit exceptional volume stability and minimal permanent linear change. They resist thermal shrinkage and deformation under continuous service up to 1350°C, ensuring a stable, gap-free backup lining that prevents heat leakage and extends equipment lifespan.
- Cost-Effective Insulation As a standard thermal management solution, insulating fireclay bricks offer an outstanding balance of thermal performance and affordability. Compared to high-alumina alternatives, they provide highly economical insulation for non-load-bearing applications in blast furnaces, glass tanks, and ceramic kilns, effectively optimizing your project budget without compromising efficiency.
Uses of Kerui Clay Insulating Brick
Due to their excellent thermal insulation properties and reliable volume stability, clay insulating bricks are widely selected for industrial thermal management. They effectively minimize heat loss and lower overall energy consumption without adding excessive weight to the furnace structure. To optimize thermal efficiency and protect the outer steel shells, they are primarily used as non-load-bearing, backup insulation linings in the following high-temperature equipment:
- Steel and metallurgical industry: Hot blast stoves, reheating furnaces, annealing furnaces, heat treatment furnaces, coke ovens, and industrial flue gas ducts.
- Petrochemical industry: Cracking furnaces, reforming furnaces, industrial boilers, and primary heating furnaces.
- Ceramic industry: Roller kilns, tunnel kilns, shuttle kilns, and other structural firing equipment.
- Cement and building materials industry: The backup insulation layers of rotary kilns, lime kilns, and cooling zones.
- Glass industry: Glass melting furnaces (specifically for regenerator walls and bottom insulation) and annealing lehrs.
Kerui Refractory is the Top-leading Manufacturer
Among global alumina bubble brick manufacturers, Kerui Refractory has unparalleled advantages and strength. Many customers in high-temperature industries choose our products and services.
Brand Strength
- Rank top three in the refractory industry in China;
- High brand recognition among customers;
- Over 20 patents, ISO and other international certifications.
Factory
- 20-years experience in production, quality inspection, and shipping;
- Located in the refractory production base in Xinmi City, Henan Province, China;
- Strictly digitalized production and testing systems.
Services
- Alumina bubble brick matching refractory solution design;
- Fast delivery with synchronized shipping logistics information;
- On-site construction guidance, and technical support.
ontact Kerui Refractory for Clay Insulating Bricks
Kerui Refractory supplies reliable clay insulating bricks tailored for your industrial kilns. With mature production facilities and a dedicated technical team, we support our clients with comprehensive thermal insulation solutions—from customized brick sizing and furnace lining design to on-site installation guidance. Partner with Kerui to optimize your thermal management. View the Kerui Facebook page to follow our latest updates.
