ASTM C1126-00 - 10.11.2000
 
1. Scope

1.1 This specification applies to faced or unfaced, rigid cellular phenolic thermal insulation in either board or tubular form. It does not apply to field expanded cellular phenolic materials.

1.2 Materials covered by this specification are used as roof insulation; sheathing or rigid board for non-load bearing, building material applications; and pipe insulation for use between -40 and 257oF (-40 and 125oC). Type II Grade 1 and Type III Grade 1 materials with an appropriate vapor retarder covering on the warm surface can be used to a lower temperature limit of -290oF (-180oC). (See 7.2.)

1.3 The values stated in inch-pound units are to be regarded as standard. International Standard Units (SI) are given in parentheses.

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. For specific precautionary statements, see Section 16 .

 
2. Referenced Documents

C921-10

Standard Practice for Determining the Properties of Jacketing Materials for Thermal Insulation

C165-23

Standard Test Method for Measuring Compressive Properties of Thermal Insulations

C1058/C1058M-10(2023)

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

C1363-24

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

D6226-21

Standard Test Method for Open Cell Content of Rigid Cellular Plastics

C550-26

Standard Test Method for Measuring Trueness and Squareness of Rigid Block and Board Thermal Insulation

E96/E96M-24a

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

C1303/C1303M-23

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

D1621-16(2023)

Standard Test Method for Compressive Properties of Rigid Cellular Plastics

D1622-26

Standard Test Method for Apparent Density of Rigid Cellular Plastics

D1623-17(2023)

Standard Test Method for Tensile and Tensile Adhesion Properties of Rigid Cellular Plastics

D2126-25

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

E84-26a

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

C168-25

Standard Terminology Relating to Thermal Insulation

C177-19e1

Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus (Includes all amendments and changes 2/23/2023).

C209-20(2026)

Standard Test Methods for Cellulosic Fiber Insulating Board

C335/C335M-23

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

C518-21

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

C585-22

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

C1045-19

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