ZIRCAR Refractory Composites, Inc. recently announced the introduction of its refractory sheet type RS-99, a high-strength, high-temperature ceramic composite material that machines with standard tooling. Type RS-99 is a high-density, fiber-based ceramic material with greater than 99% alumina purity. It is usable to temperatures of 1650C (3002F) and is able to withstand over 500 hours of continuous submersion in molten aluminum at 750C (1382F) with no wetting or degradation in properties. Alumina content of the new composite is ideal for high vacuum, reducing atmospheres and other applications where silica cannot be tolerated, such as setters for P/M and MIM applications.
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