General Information
ZIRCAR Ceramics’ Alumina Castable Type ZIRALCAST-94 is a high-purity, lightweight refractory material primarily composed of hollow, fused alumina bubbles and high-quality hydraulically setting cement. It is designed for applications up to 1815°C (3300°F) and offers low thermal conductivity, excellent chemical stability, and good strength. It is installed using conventional concrete placement techniques.

Characteristics & Properties

• Composition (wt%): AI2O3 94.5, CaO 4.8, SiO2 0.4, Fe2O3 0.1, Alkali 0.2
• Water of Hydration: 14-17%
• Hydraulic Set Time: Initial 1.5-6 hours, Final 4-8 hours
• Grain Size: 4 mesh (5 mm) and finer
• Density (g/cc): As Cast 1.68, After firing to 1095°C 1.59, 1370°C 1.62, 1650°C 1.54
• Modulus of Rupture (MPa): After firing to 815°C 4.9, 1095°C 2.7, 1370°C 7.9, 1650°C 10.5
• Firing Shrinkage (%): After firing to 760°C 0.3, 980°C 0.1, 1315°C 0, 1480°C -0.3
• Thermal Conductivity (W/m°K): 1038°C 0.71, 1249°C 0.72, 1460°C 0.79, 1671°C 0.93
• Shelf Life: Not to exceed 24 months

Ordering Information
Standard ZIRALCAST-94 can be ordered online or by specifying quantity, item number, and description. It is available in 25kg (55 lb.) bags, with 48 bags per pallet. Custom precast shapes are available upon request.

Suggested Applications
ZIRALCAST-94 is suitable for use as an insulating refractory in high-temperature furnaces, manufacturing low-density cast refractory shapes, crucible support in laboratory glass melting furnaces, and as a liner for crucible pre-heaters.