ASTM C1631-05 - 1.11.2005
 
1. Scope

1.1 This specification covers the types, physical properties, and dimensions of cellular polypropylene intended for use as thermal insulation for temperatures from - 150 to + 240°F (-101 to + 116°C).

1.2 The use of thermal insulation materials covered by this specification is regulated by codes and standards that address fire performance.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.

1.4 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

D3575-20

Standard Test Methods for Flexible Cellular Materials Made from Olefin Polymers

C390-08(2024)

Standard Practice for Sampling and Acceptance of Thermal Insulation Lots

D1622-26

Standard Test Method for Apparent Density of Rigid Cellular Plastics

D1600-18

Standard Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)

C1363-24

Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus

C1114-06(2019)

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

C870-24

Standard Practice for Conditioning of Thermal Insulating Materials

C518-21

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

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).

E176-24a

Standard Terminology of Fire Standards (Includes all amendments and changes 12/9/2024).

UL 723

Test for Surface Burning Characteristics of Building Materials

C165-23

Standard Test Method for Measuring Compressive Properties of Thermal Insulations

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

C272-01

Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions

C303-21

Standard Test Method for Dimensions and Density of Preformed Block and Board–Type Thermal Insulation

D2126-25

Standard Test Method for Response of Rigid Cellular Plastics to Thermal and Humid Aging