ASTM C1427-99a - 10.11.1999
 
1. Scope

1.1 This specification covers two grades of preformed flexible cellular non-crosslinked polyolefin thermal insulation. Grade 1 is for operating temperatures from -150°F to 200°F (-101°C to 93°C). Grade 2 is for operating temperatures from -40°F to 158°F (-40°C to 70°C). 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 may be governed by building codes that address fire performance.

1.3 This specification covers the physical properties of preformed flexible cellular non-crosslinked polyolefin thermal insulation, which have been deemed mandatory for thermal design. Physical properties such as density and coefficient of thermal expansion (CTE) have been deemed nonmandatory for thermal design. Nonmandatory physical properties have been included in Appendix X1 for information purposes only.

1.4 The values stated in inch-pound units are to be regarded as the standard. The metric unit equivalents of inch-pound units, given in parentheses, may be approximate.

1.5 The following safety hazards caveat pertains only to the test methods portion, Section 11, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

 
2. Referenced Documents

C1114-06(2019)

Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus

C1303-09

Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation

C518-21

Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus

C1304-23

Standard Test Method for Assessing the Odor Emission of Thermal Insulation Materials

C534-07

Standard Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in Sheet and Tubular Form

D883-26b

Standard Terminology Relating to Plastics (Includes all amendments and changes 8/24/2026).

D1622-26

Standard Test Method for Apparent Density of Rigid Cellular Plastics

D1667-22

Standard Specification for Flexible Cellular Materials—Poly (Vinyl Chloride) Foam (Closed-Cell)

D3575-20

Standard Test Methods for Flexible Cellular Materials Made from Olefin Polymers

C1763-20(2025)

Standard Test Method for Water Absorption by Immersion of Thermal Insulation Materials

E456-13a(2022)e1

Standard Terminology Relating to Quality and Statistics (Includes all amendments and changes 4/16/2024).

E691-23

Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

E2231-26a

Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to Assess Surface Burning Characteristics (Includes all amendments and changes 8/26/2026).

E84-26a

Standard Test Method for Surface Burning Characteristics of Building Materials (Includes all amendments and changes 4/15/2026).

E96/E96M-24a

Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials (Includes all amendments and changes 11/20/2024).

E177-26a

Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods (Includes all amendments and changes 5/14/2026).

E228-22

Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer

CAN/ULC-S102.2

Standard Method of Test for Surface Burning Characteristics of Flooring, Floor Coverings and Miscellaneous Materials and Assemblies.

C168-25

Standard Terminology Relating to Thermal Insulation

C177-19(2026)

Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus

C335-05a

Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation

C390-08(2024)

Standard Practice for Sampling and Acceptance of Thermal Insulation Lots

C411-26

Standard Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation

C447-15(2022)

Standard Practice for Estimating the Maximum Use Temperature of Thermal Insulations

C585-22

Standard Practice for Inner and Outer Diameters of Thermal Insulation for Nominal Sizes of Pipe and Tubing

C670-24ae1

Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials (Includes all amendments and changes 2/21/2025).

C1045-19(2026)

Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions

C1058-03

Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation