Grade 23 Mullite Brick

Xinhui Grade 23 lightweight mullite brick uses high-purity refractory powders as the base material. It is formulated to the target bulk density and produced with organic composite pore-forming materials, vacuum extrusion forming, high-temperature sintering, and precision machining. The product combines lightweight insulation with structural strength and is suitable for high-temperature linings and insulation applications.

• Low heat capacity and low thermal conductivity: faster heat-up, lower furnace heat storage loss, and more stable energy savings
• High purity and low impurities: better chemical stability and more reliable corrosion resistance
• High temperature resistance with direct flame contact: suitable for hot-face or semi-hot-face conditions
• High strength with excellent volume stability: less deformation at high temperature for safer long-term operation
• Accurate dimensions and good machinability: easy cutting and more efficient on-site brick laying

Insulation linings, insulation layers, furnace walls, and furnace roofs in various industrial kilns and thermal equipment where lightweight insulation and stable performance are required.

Grade	Max. Service Temp. °C	Bulk Density g/cm³	Thermal Conductivity W/(m·K) @1000°C	Cold Crushing Strength MPa	Chemical Composition (wt%)
Grade 23 lightweight mullite brick	1300	0.6–0.8	0.30–0.40	2–5	Al₂O₃ 42–46 / SiO₂ 50–54

Typical values for product selection; final values follow the test report supplied with each order.