ZIRCAR Ceramics’ Alumina-silica Insulation Type HASH-60 is a high-strength, uniform, rigid, refractory board composed of shot-free refractory ceramic fibers (RCF) and high-purity alumina binders. HASH-60’s fine open-pore structure delivers excellent high-temperature thermal and electrical insulating properties with very good hot strength and dimensional stability to 1093°C (2000°F). Its homogeneous microstructure and consistent binder distribution allow it to be machined to tight dimensional tolerances.
HASH-60 is used extensively as an insulator in high-powered electrical switch gear due to its high-temperature dielectric strength and arc-quenching ability. The “All Alumina” bond provides high surface area for the adsorption of water, a key factor in high-power arc quenching. Its high electrical resistivity at elevated temperatures makes it ideal for use in direct contact with many different resistance heating elements.
HASH-60 is pre-fired, contains no organic binders and will produce no smoke or odors when heated. It has 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.