30-55% Alumina Fire Clay Brick Insulation Low Thermal Conductivity
Leadsun Refractory's Low Thermal Conductivity Fire Clay Brick 30-55% Alumina Insulation is engineered for superior thermal management and durability in high-temperature applications. Manufactured from high-quality flint clay with 30-55% alumina content and characterized by low iron and alkali, these bricks provide exceptional resistance to thermal shock, abrasion, and chemical attack. They are the most cost-effective and widely used solution for various industrial kilns and furnaces, ensuring extended service life and reliable performance.
Technical data
| Item | SK-30 | SK-32 | SK-34 | SK-36 |
| AL2O3 % (min) | 30-35% | 35-38% | 38-42% | 50-55% |
| Fe2O3% (max) | 3 | 3 | 2.8 | 2.5 |
| Refractoriness | ≥1670°C | ≥1690°C | ≥1710°C | ≥1750°C |
| Refractoriness under load, 0.2MPa, (°C) | ≥1270 | ≥1350 | ≥1350 | ≥1430 |
| Apparent porosity (%) | 20-24 | 20-24 | 19-23 | 18-22 |
| Bulk density (g/cm³) | 2.00-2.05 | 2.05-2.1 | 2.1-2.15 | 2.15-2.25 |
| Cold crushing strength (MPa) | ≥25 | ≥30 | ≥35 | ≥45 |
| Thermal expansion at 1000°C (%) | ≤0.6 | ≤0.55 | ≤0.55 | ≤0.4 |
- Low thermal conductivity for improved energy efficiency
- High cold crushing strength ensures durability under load
- Good dimensional stability at elevated temperatures
- Easy to install and shape as per requirement
- Can be used in oxidizing or reducing atmospheres
- Carbon bake furnaces in the aluminum industry
- Rotary cement kiln preheat zones and cyclones
- Glass tank insulation and coke oven linings
- Blast furnaces, reheating furnaces, and suspended roofs
- Lime kilns, chimneys, and other high-temperature industrial environments
- Standard wooden pallets or as per customer requirement
- Moisture-proof wrapped for long-distance shipping
- Delivery time: 15–20 days after order confirmation
Our fire clay bricks are manufactured under strict quality control using selected raw materials to ensure consistent performance in extreme thermal conditions. With over a decade of experience in refractory solutions, we provide reliable products that enhance furnace life and reduce maintenance costs.
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