INSBOARD is a low density ceramic fiber that can be used up to temperatures of 2300F. INSBOARD is a lightweight vacuum formed ceramic fiber board with excellent insulating characteristics, thermal stability, and machinability where special shaped boards are required. Its lightweight enables easy cutting and machining in the field. Applications include areas where high-quality back up insulation is required. *Please not due to special packaging requirements special handling charges will apply and a minimum of 3 boards per order are required. Its dimensions are: 1'X24"X36" (72 sf/12 ctn)per sheet.