Dense Alumina Hearth Plate Type DAHP General Information ZIRCAR Ceramics' Dense Alumina Hearth Plates, Type DAHP, are used for supporting loads in high-temperature furnaces and other thermal process systems. These dense plates are combinations of medium-sized high-purity alumina grains and an alumina binder. Dry-pressed then fully sintered, DAHP exhibit high strength and utility in industrial applications with operating temperatures as high as 1870°C (3400°F). DAHP hearth plates are routinely used as hearth plates in low-mass furnaces with air atmospheres operating to 1825°C (3317°F). They may be positioned directly on the furnace floor or supported with hearth posts made of reticulated alumina, bubble alumina or fiber-filled alumina tubes. These plates are also useful in furnaces with hydrogen atmospheres operating over 1700°C (3100°F). They are of exceptionally high Al2O3 purity but are not ideal for use in extreme thermal shock environments. 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 based upon irreversible linear shrinkage. ** Properties expressed parallel to thickness. t Properties expressed perpendicular to thickness. ZIRCAR Ceramics, Inc. PO Box 519 Technical Data Bulletin 100 N. Main St., Florida, NY 10921-0519 Dense Alumina Hearth Plate Type DAHP E-mail: [email protected] Page 1 of 2

Dense Alumina Hearth Plate Type DAHP Suggested Applications Load-bearing members in furnaces and thermal process systems operating as high as 1870°C (3400°F). Hearth plates in low-mass furnaces with air atmospheres operating to 1825°C (3317°F). Support plates in furnaces with hydrogen atmospheres operating over 1700°C (3100°F). High-temperature setters, supports and process fixtures. To Order Standard plates: order online or specify quantity, item # and description. Standard hearth plates are available for immediate shipment from stock. Standard tolerances for DAHPs are as follows: D9110, DAHP,...