Alumina Type AL-30 General Information ZIRCAR Ceramics’ Alumina Type AL-30 is a medium-density, high-strength, uniformly rigid refractory structure composed of high-alpha polycrystalline alumina fibers and high-purity inorganic binders. AL-30 exhibits a fine, open-pore structure and is made to an optimum bulk density of 0.48 g/cc (30 pcf) which gives it very low thermal conductivity at elevated temperatures. AL-30 has very good hot strength and dimensional stability to 1600°C (2822°F) and withstands intermittent use to 1700°C (3192°F). AL-30 is manufactured with a high fiber-to-binder ratio making it highly machinable to precise dimensional tolerances. It exhibits high electrical resistivity with low losses in microwave and RF transparency at elevated temperatures. AL-30 is pure white and exhibits high reflectance. AL-30 is pre-fired, contains no organic binders and will produce no smoke or odors when heated. AL-30 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. Characteristics & Properties Color ZIRCAR Ceramics, Inc. PO Box 519 100 N. Main St., Florida, NY 10921-0519 Telephone: (845) 651-6600 E-mail: [email protected] Technical Data Bulletin Alumina Type AL-30 www.zircarceramics.com Page 1 of 2

Alumina Type AL-30Characteristics & Properties Continued Flexural Strength**, MPa (psi) at 30% Strain The data presented herein is intended to help the user to determine the appropriateness of this material for their application. This data is a nominal representation of this product's properties and characteristics and therefore should not be used in preparing specifications. * Maximum use temperature is dependent on variables such as stresses, both thermal and mechanical, and the chemical environment that the material experiences. ** Properties expressed parallel to thickness. f Properties expressed...