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Document Designation and Title Year Select Item(s) C1427 Standard Specification for Extruded Preformed Flexible Cellular Polyolefin Thermal Insulation in Sheet and Tubular Form 07e1 C1427 Standard Specification for Extruded Preformed Flexible Cellular Polyolefin Thermal Insulation in Sheet and Tubular Form 07 C1427 Specification for Extruded Preformed Flexible Cellular Polyolefin Thermal Insulation in Sheet and Tubular Form 04 C1427 Specification for Preformed Flexible Cellular Polyolefin Thermal Insulation in Sheet and Tubular Form 99a