ZIRCAR Ceramics’ Alumina-Silica Insulation Type AXHTM is a strong, rigid refractory structure of high-alpha alumina and high-purity refractory ceramic fibers (RCF). Its binder is a high-purity inorganic Colloidal (Amorphous) Silica. AXHTM offers low thermal conductivity, excellent thermal shock resistance and is an effective thermal insulator in numerous thermal process systems with continuous operating temperatures of 1420°C (2600°F). Unique to this type of material are its rigid, almost crusty outer surfaces with a less bound interior. AXHTM is frequently machined or cut into custom configurations. In applications where a strong exterior is desired AXHTM’s original exterior hardness can be easily restored with the use of ZIRCAR Ceramics’ Silica Rigidizer Type SI-RIG.
AXHTM contains no organic binders and produces no smoke or odor when heated. It is unaffected by oil or water. It is, however, attacked by hydrofluoric acid, phosphoric acid and strong alkalis.