ZIRCAR Ceramics’ Alumina Type ZAL-45AA is a high-density high-strength, uniformly rigid refractory structure composed of high-alpha polycrystalline alumina fibers and high purity alumina binders. ZAL-45AA exhibits a fine open-pore structure and is made to a high bulk density of 0.72g/cc (45pcf) which gives it a unique combination of high strength and low thermal conductivity at elevated temperatures. ZAL-45AA exhibits a very high Al₂O₃ content giving it superior resistance to chemical attack and dimensional stability in industrial applications with continuous temperatures of 1550°C(2822°F) with intermittent use to 1600°C (2912°F).
ZAL-45AA is manufactured with a high fiber-to-binder ratio making it highly machinable to precise dimensional tolerances. It exhibits high electrical resistivity with high microwave and RF transparency at elevated temperatures. ZAL-45AA is pure white and exhibits high reflectance.
ZAL-45AA is pre-fired contains no organic binders and will produce no smoke or odors when heated. ZAL-45AA shows excellent resistance to chemical attack and is not affected by oil or water. It is, however, affected by hydrofluoric acid, phosphoric acid and strong alkalis.