ZIRCAR Ceramics’ Alumina-Silica Insulation Type AXL is a strong, rigid refractory structure of high-purity refractory ceramic fibers (RCF) and high-purity inorganic Colloidal (Amorphous) Silica binders. AXL offers low thermal conductivity, excellent thermal shock resistance and is an effective thermal insulator in numerous thermal process systems with continuous operating temperatures of 1260°C (2300°F). Unique to this type of material is its rigid, almost crusty outer surfaces with its much less bound interiors. AXL is frequently machined or cut into custom configurations. In applications where a strong exterior is desired AXL’s original exterior hardness can be easily restored with the use of ZIRCAR Ceramics’ Silica Rigidizer Type SI-RIG. AXL 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.