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CoorsTek AD-998 Labware is made of 99.8% pure aluminum oxide. Highly resistant to chemical attack, this alumina-ceramic ware is especially useful to chemists, metallurgists, and others involved in high-temperature work demanding contamination-free results. AD-998 ware is highly refractory, meant for use in reducing and oxidizing atmospheres. It is inert in hydrogen and carbonaceous atmospheres and offers high resistance to alklalies and other fluxes. Suitable for glass melting, including borosilicate glass. Recommended for use with refractory metals such as molybdenum, platinum, rhodium, tungsten, tantalum, and iridium. High-Alumina Labware temperature change rate should not exceed 150° C/hour.


Maximum Use Temperature (no load)1750° C
Thermal-Expansion Coefficient (25° to 1000°)8.0 x 10-6/° C
Compressive Strength300,000 psi
Specific Gravity3.9 (Typical)
Hardness79 on Rockwell 45N scale
9 on Mohs scale
Water AbsorptionNone
Chemical Tests
(65503 Crucible 2 32g weight) (4 hours.: weight loss ~6x10-4%)
Hot 10% sodium hydroxide, 100° C
(4 hours.: weight loss ~9x10-4%
Hot 50% phosphoric acid, 90° C
(4 hours.: weight loss ~0.16%)

These AD-998 items are available from laboratory supply dealers or directly from CoorsTek, Inc. Other shapes are available on special order. Additional information regarding AD-998 properties is available upon request.
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