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  • ASTM
    C1303/C1303M-22 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
    Edition: 2022
    $148.51
    Unlimited Users per year

Description of ASTM-C1303/C1303M 2022

ASTM C1303/C1303M-22

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




ASTM C1303/C1303M

Scope

1.1 This test method covers a procedure for predicting the long-term thermal resistance (LTTR) of unfaced or permeably faced rigid gas-filled closed-cell foam insulations by reducing the specimen thickness to accelerate aging under controlled laboratory conditions (1-5) .2

Note 1: See Terminology, 3.2.1, for the meaning of the word aging within this standard.

1.2 Rigid gas-filled closed-cell foam insulation includes all cellular plastic insulations manufactured with the intent to retain a blowing agent other than air.

1.3 This test method is limited to unfaced or permeably faced, homogeneous materials. This method is applied to a wide range of rigid closed-cell foam insulation types, including but not limited to: extruded polystyrene, polyurethane, polyisocyanurate, and phenolic. This test method does not apply to impermeably faced rigid closed-cell foams or to rigid closed-cell bun stock foams.

Note 2: See Note 8 for more details regarding the applicability of this test method to rigid closed-cell bun stock foams.

1.4 This test method utilizes referenced standard test procedures for measuring thermal resistance. Periodic measurements are performed on specimens to observe the effects of aging. Specimens of reduced thickness (that is, thin slices) are used to shorten the time required for these observations. The results of these measurements are used to predict the long-term thermal resistance of the material.

1.5 The test method is given in two parts. The Prescriptive Method in Part A provides long-term thermal resistance values on a consistent basis that can be used for a variety of purposes, including product evaluation, specifications, or product comparisons. The Research Method in part B provides a general relationship between thermal conductivity, age, and product thickness.

1.5.1 To use the Prescriptive Method, the date of manufacture must be known, which usually involves the cooperation of the manufacturer.

1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.7 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 Table of Contents: 

 

Section

Scope

1

Reference Documents

2

Terminology

3

Summary of Test Method

4

Significance and Use

5

Part A: The Prescriptive Method

6

  Applicability

6.1

    Qualification Requirements

6.1.1

    Facing Permeability

6.1.2

  Apparatus

6.2

  Sampling

6.3

    Schedule

6.3.1

  Specimen Preparation

6.4

    Goal

6.4.1

    Schedule

6.4.2

    Replicate Test Specimen Sets

6.4.3

    Specimen Extraction

6.4.4

    Slice Flatness

6.4.5

    Slice Thickness

6.4.6

    Stack Composition

6.4.7

  Storage Conditioning

6.5

  Test Procedure

6.6

    Thermal Resistance Measurement Schedule

6.6.1

    Thermal Resistance Measurements

6.6.2

    Product Density

6.6.3

  Calculations

6.7

Part B: The Research Method

7

  Background

7.1

  TDSL Apparatus

7.2

  Sampling Schedule

7.3

  Specimen Preparation

7.4

  Storage Conditioning

7.5

  Test Procedure

7.6

  Calculations

7.7

Reporting

8

 Reporting for Part A, the Prescriptive Method

8.1

 Reporting for Part B, the Research Method

8.2

Precision and Bias

9

Keywords

10

Mandatory Information – Qualification

Annex A1

 Specimen Preparation

A1.1

 Homogeneity Qualification

A1.2

Thermal Conductivity Equivalence Test Procedure

A1.3

 Alternate Product Thickness Qualification

A1.4

Example Calculations

A1.5

Mandatory Information-Preparation of Test Specimens for Spray-Foam Products

Annex A2

Effect Of TDSL

Appendix X1

History of the Standard

Appendix X2

Theory of Foam Aging

Appendix X3

References

 

1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


Keywords

aging; long-term thermal resistance; LTTR; rigid closed-cell plastic foams; scaling factors; thermal insulation; thermal resistance; time-averaged thermal resistance;


ICS Code

ICS Number Code 83.100 (Cellular materials)


DOI: 10.1520/C1303_C1303M-22

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