Alumina Ceramic Insulators for Thermocouples, Thermistors, and RTD’s These tubes are normally used in but not limited to the semiconductor, aerospace, steel, glass, aluminum and investment casting industries. SEND INQUIRY You can make an inquiry about this product.Your e-mail will not be leaked. PRODUCT DETAIL We supply Single or Multi-bore tubing used to insulate wires. ceramic insulator Share: RELATED PRODUCTS