Mullite Castable

Mullite Castable

Material System & Positioning

Mullite castable uses mullite chamotte or synthetic mullite aggregate with Al₂O₃ ≥75% and service up to 1650℃. The low thermal expansion of mullite and high load softening point (≥1550℃) give excellent thermal shock and creep resistance. It is Henan Songrui's professional grade for long-term high-temperature service in glass furnaces and petrochemical heaters.

Key Performance

• High load softening point: ≥1550℃, no softening under long-term hot load.
• Good thermal shock resistance: uniform expansion prevents cracking under temperature swings.
• Low creep: stable under long-term load for crowns and load-bearing structures.
• Good erosion resistance: neutral material compatible with many slags and atmospheres.
• Stable volume: minimal linear change in long-term service.

Applications

• Glass: regenerator checkers, crowns and breast walls, forehearth and feeder linings.
• Ceramics: tunnel and roller kiln hot zones, car tops and saggar pads.
• Steel & Iron: upper hot blast stove checkers, mixer roofs, reheating furnace roofs and flues.
• Power Boilers: boiler roof hanger zones, cyclone inlets.

Selection Advice

Pure mullite offers the best thermal shock resistance at lower cost for temperature-cycling structures; corundum-mullite has higher hot strength for heavier loads and higher temperatures.

Installation & Maintenance

Heat up with staged holding before high-load operation to avoid thermal cracking; control water strictly and densify 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).

• Mullite aggregate with high refractoriness under load
• Creep and thermal shock resistant under long hot load
• Uniform expansion limits thermal-cycling cracking
• For glass furnace crowns, regenerators and petrochemical heaters
• Better than high-alumina for long-term hot service
• Requires staged holds before heavy load service

Mullite castable excels in thermal shock resistance:

• Glass: regenerator checkers, crowns and breast walls, forehearth and feeder linings.
• Ceramics: tunnel and roller kiln hot zones, car tops and saggar pads.
• Steel & Iron: upper hot blast stove checkers, mixer roofs, reheating furnace roofs and flues.
• Power Boilers: boiler roof hanger zones, cyclone inlets.
• Advantage: service up to 1650℃, excellent thermal shock resistance, low linear change.