Alumina Type CRYSTAL-18 General Information ZIRCAR Ceramics’ Aumina Type CRYSTAL-18 insulating boards, cylinders and custom shapes are vacuum-formed combinations of polycrystalline (PCW) alumina fiber, high-purity Refractory Ceramic Fiber (RCF) and refractory binders. CRYSTAL-18 exhibits low thermal conductivity, good strength, superior thermal shock resistance and high dimensional stability in applications with continuous temperatures to 1550oC (2822oF). CRYSTAL-18A is dried and contains a few wt% organic binder. CRYSTAL-18B has been prefired and is organic-free. CRYSTAL-18 exhibits an open-pore structure which readily accepts surface rigidizations or coating with ceramic adhesives. Such surface treatments enhance CRYSTAL-18’s strength and handleability for use in MoSi2 Heating Element Assemblies and other advanced systems. CRYSTAL-18 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 Typical Composition, % 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 perpendicular to thickness. ZIRCAR Ceramics, Inc. PO Box 519 Technical Data Bulletin 100 N. Main St., Florida, NY 10921-0519 Alumina Type CRYSTAL-18 E-mail: [email protected] Page 1 of 2

Alumina Type CRYSTAL-18 ITEM # * Denotes standard stocked items. Suggested Applications Primary thermal insulation in low mass furnaces and thermal process systems operating to continuous temperatures of 1550°C (2822°F) with intermittant use to 1600oC (2912oF). Backup thermal insulation in furnaces and thermal process systems operating to temperatures exceeding 2000°C (3632°F). Reflector tiles in infrared paper drying equipment. Launders, distribution boxes, pouring spouts, hot tops and others involving molten metal contact. High temperature setters, supports and process fixtures. Electrical...