General Information
ZIRCAR Ceramics’ Alumina Type ZAL-45 is a high-density, high-strength refractory material composed of high-alpha polycrystalline alumina fibers and high-purity inorganic binders. It features a fine open-pore structure with a bulk density of 0.72g/cc, offering high strength and low thermal conductivity at elevated temperatures. ZAL-45 maintains dimensional stability up to 1650°C and can withstand intermittent use up to 1700°C. It is highly machinable, exhibits high electrical resistivity, and is microwave and RF transparent at high temperatures. The material is pure white with high reflectance and is resistant to chemical attack, except by hydrofluoric acid, phosphoric acid, and strong alkalis.

Thermal Conductivity
Measured using ASTM C177-76, the thermal conductivity varies with temperature: 0.16 W/m°K at 250°C, increasing to 0.43 W/m°K at 1650°C.

Suggested Applications
ZAL-45 is suitable for primary thermal insulation in low-mass furnaces and thermal process systems up to 1650°C, supports and fixtures in Hot Isostatic Presses, molten metal contact applications, high-temperature setters, and electrical insulation in high-temperature systems.

Availability
Standard boards are available in various sizes, with custom boards and shapes also possible. Surface treatments such as rigidization and coating are available.