1.1 This specification covers two grades of extruded preformed flexible cellular polyolefin thermal insulation. Grade 1 is for operating temperatures from -150F to 200F (-101C to 93C). Grade 2 is for operating temperatures from -297F to 250F (-182C to 121C). For specific applications, the actual temperature limit shall be agreed upon between the manufacturer and the purchaser.1.2 The use of thermal insulation materials covered by this specification are governed by codes and standards