What are the Performance Characteristics of Mullite Insulation Bricks?

Mullite insulation bricks are high-alumina refractory materials with mullite (3Al₂O₃·2SiO₂) as the primary crystalline phase. Their alumina (Al₂O₃) content typically ranges from 65% to 75%, resulting in excellent high-temperature resistance and thermal insulation properties. They are available in three different bulk densities: 0.8 g/cm³, 1.0 g/cm³, and 1.2 g/cm³, suited to varying temperatures and operating conditions.

Mullite Insulation Bricks

Characteristics of Mullite Insulation Bricks

1.  Excellent Thermal Insulation: Mullite insulation bricks have low thermal conductivity, effectively reducing heat loss, improving kiln insulation, and reducing energy consumption.
2.  Low heat capacity, energy-saving and high efficiency. Due to its low thermal conductivity, this material stores less heat energy, making it particularly suitable for intermittent kilns (such as shuttle kilns), significantly reducing heating energy consumption and improving thermal efficiency.
3.  High refractoriness and strong chemical stability. The product has an extremely low impurity content (such as Fe₂O₃ and alkali metal oxides), enabling it to maintain excellent performance even at high temperatures. Its high alumina content makes it stable even in reducing atmospheres and resistant to corrosion.
4.  Excellent hot compressive strength: Even in high-temperature environments, mullite insulation bricks maintain high mechanical strength, ensuring the long-term stability of the kiln lining.
5.  Precise dimensions for easy installation. The precise dimensions of Jie bricks reduce the need for adjustments during masonry, speeding up construction and reducing the amount of refractory mortar used, thereby improving the overall strength and durability of the masonry. Furthermore, the product can be customized to specific shapes to reduce the number of joints and bricks, further optimizing the kiln structure.

Key Application Areas of Mullite Insulation Bricks

Mullite insulation bricks are widely used in the linings of various high-temperature industrial furnaces, including but not limited to:

- Ceramic Industry: Shuttle Kilns and Roller Hearth Kilns

- Glass Manufacturing: Insulation of Glass Melting Furnaces

- Petrochemical Industry: Cracking Furnaces, Reforming Furnaces, and Other High-Temperature Equipment

- Other Industrial Furnaces: Heat Treatment Furnaces, Sintering Furnaces, etc.

Due to their high-temperature resistance, low thermal conductivity, high strength, and long lifespan, mullite insulation bricks are an ideal choice for energy-saving furnaces. They can effectively reduce operating costs and extend equipment life.

Rongsheng Mullite Polylightweight Bricks

Mullite Polylightweight Bricks

Mullite polylightweight bricks are generally designated JM, with J standing for "polylight" and M for "mullite." They are primarily used for insulation in the linings of various high-temperature furnaces, improving their thermal insulation and reducing energy consumption. Mullite polylightweight bricks are also used for insulation in thermal power plants, nuclear power plants, and other equipment.

Different grades of mullite polylightweight bricks are used in different temperature environments. Generally, they are categorized according to national standards as JM-23, JM-26, JM-28, JM-30, and JM-32. JM-32 is less commonly used, while JM-23, 26, and 28 are more commonly used.

• JM-23 mullite polylightweight bricks have an Al₂O₃ content of 48%, an operating temperature of 1300°C, and a bulk density ranging from 0.55 to 1.5, with 0.8 and 1.0 being the most commonly used. The reburning curve varies within ±1°C at 1300°C for 24 hours.
• JM26 mullite lightweight bricks have an Al2O3 content ≥55% and are used at 1400°C. Their bulk density ranges from 0.55 to 1.5, with 0.8 and 1.0 being the most commonly used. Their reburning curve varies within 0.7 to 0.8°C at 1400°C for 24 hours.
• JM28 mullite lightweight bricks have an Al2O3 content of 65% and are used at 1500°C. Their bulk density ranges from 0.55 to 1.5, with 0.8 and 1.0 being the most commonly used. Their reburning curve varies within 0.7°C at 1500°C for 24 hours.
• JM30 has an Al2O3 content of 72% and is used at 1600°C. Their bulk density ranges from 0.55 to 1.5, with 0.8 and 1.0 being the most commonly used. Its reburning temperature range is 0.6°C to 1600°C for 24 hours.
• JM32 is not commonly used and is generally custom-made to meet specific customer requirements.

Different brands of mullite polylightweight bricks are used at different operating temperatures and are selected based on the user's kiln temperature and operating conditions, depending on the type of furnace. However, other performance requirements may apply, and these are all produced and formulated to meet the specific needs of the manufacturer.