Corundum-Mullite Castable

Corundum-Mullite Castable

Material System & Positioning

Corundum-mullite castable combines corundum and mullite aggregate with Al₂O₃ ≥80% and service up to 1700℃. It merges corundum hot strength with mullite thermal shock resistance, with low high-temperature creep and stable volume—ideal for glass furnaces, ceramic kilns and other high-temperature zones with frequent temperature swings.

Key Performance

• Composite structure: corundum-mullite dual-phase for strength and thermal stability.
• Excellent thermal shock resistance: uniform expansion, resists spalling under temperature swings, good for frequent start-stop.
• Low creep: stable under long-term load, ideal for crowns and load-bearing structures.
• Good erosion resistance: better than pure corundum in glass slag and alkali vapor environments.
• High density: 2.80 g/cm³, CCS (110℃×24h) ≥85 MPa.

Applications

• Glass: upper regenerator checkers, port mouths, tank/breast walls, crowns.
• Ceramics: high-temperature roller kilns for sanitaryware/tableware, shuttle kiln chambers and car tops.
• Steel & Iron: reheating furnace hot hearths, hot blast stove domes and upper checkers.
• Cement: kiln hoods, cooler hot sections.

Selection Advice

Compared with pure mullite castable, corundum-mullite has higher corundum content, better hot strength and slag resistance for heavier loads and higher temperatures; pure mullite offers superior thermal shock resistance at lower cost. Recommended for glass hot zones and ceramic kilns.

Installation & Maintenance

A medium-temperature holding stage during heat-up promotes mullitization for best performance; control water strictly and vibrate fully. Drying curves and on-site guidance available.

Quality Assurance

Henan Songrui New Refractory Materials Co., Ltd. (Xuanhua Town Industrial Park, Henan) is a 2024 Class A taxpayer and SRDI SME. For selection, quotation or installation guidance, contact Manager Zheng (17513376789 / 17513376789@163.com).

• Corundum-mullite composite balancing strength and thermal stability
• Excellent thermal shock resistance against spalling
• Low hot creep under long-term load
• For glass furnace superstructures, crowns and ports
• Better than pure corundum for frequent shutdown cycling
• Drying needs mid-temperature holds for mullite formation

Corundum-mullite castable combines corundum hot strength with mullite thermal shock resistance:

• Glass: upper regenerator checkers, port mouths, tank walls and breast walls.
• Ceramics: high-temperature roller kilns for sanitaryware and tableware, shuttle kiln chambers and car tops.
• Steel & Iron: reheating furnace hot hearths, hot blast stove domes and upper checkers.
• Cement: kiln hoods, cooler hot sections.
• Advantage: service up to 1750℃, excellent thermal shock resistance and high load softening point.