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
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Document History
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ASTM C1303/C1303M-23
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November 2023
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-22
June 2022
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-19
March 2019
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-15
December 2015
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-14
April 2014
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-12
March 2012
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-11a
May 2011
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-11
March 2011
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303/C1303M-10
June 2010
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303-09a
December 2009
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303-09
November 2009
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303-08e1
September 2008
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303-08
September 2008
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303-07
February 2007
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
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ASTM C1303-00
March 2000
Standard Test Method for Estimating the Long-Term Change in the Thermal Resistance of Unfaced Rigid Closed Cell Plastic Foams by Slicing and Scaling Under Controlled Laboratory Conditions
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