Refractory cement, also known as calcium aluminate cement (CAC), is a specialized binding material engineered to withstand extremely high temperatures, typically exceeding 1500°C (2732°F). Unlike ordinary Portland cement, which degrades and loses strength under intense heat, refractory cement maintains its structural integrity and chemical stability in furnaces, kilns, fireplaces, and industrial reactors.

The unique performance of refractory cement stems from its distinct chemical composition and manufacturing process. The primary raw materials are limestone (calcium carbonate) and bauxite (aluminum ore), which are crushed, mixed, and heated in a kiln to approximately 1600°C through a process called sintering.

• High alumina content (40-80% Al₂O₃) provides excellent resistance to thermal shock, abrasion, and chemical attack
• Rapid strength gain and good volume stability
• Can be cast into complex shapes for custom applications
• Used as binding agent in refractory concretes, mortars, and castables
• Applications include industrial chimneys, steel ladles, pottery kilns, and pizza ovens
• Available in low, medium, and high temperature service grades

Refractory cement requires careful curing procedures. It must be kept moist for the first 24 hours, then dried slowly to prevent steam spalling. Crucially, refractory cement should never be mixed with ordinary Portland cement, as the lime content in Portland cement will drastically lower its heat resistance.