ASTM C1303-09a
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- Standard No.
- ASTM C1303-09a
- Release Date
- 2009
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM C1303/C1303M-10
- Latest
- ASTM C1303/C1303M-23
- Scope
Rigid gas-filled closed-cell foam insulations include all cellular plastic insulations which rely on a blowing agent (or gas), other than air, for thermal resistance values. At the time of manufacture, the cells of the foam usually contain their highest percentage of blowing agent and the lowest percentage of atmospheric gases. As time passes, the relative concentrations of these gases change due primarily to diffusion. This results in a general reduction of the thermal resistance of the foam due to an increase in the thermal conductivity of the resultant cell gas mixture. These phenomena are typically referred to as foam aging.
For some rigid gas-filled closed-cell foam insulation products produced using blowing agent gases that diffuse very rapidly out of the full-thickness foam product, such as expanded polystyrene, there is no need to accelerate the aging process.
5.1.2 Physical gas diffusion phenomena occur in three dimensions. The one-dimensional form of the diffusion equations used in the development of this practice are valid only for planar geometries, that is, for specimens that have parallel faces and where the thickness is much smaller than the width and much smaller than the length.
Note 28212;Please see Appendix X3 for a discussion of the theory of accelerated aging via thin slicing.
Note 38212;Theoretical and experimental evaluations of the aging of insulation in radial forms, such as pipe insulation, have been made. (6) However, these practices have not evolved to the point of inclusion in the test standard.
The change in thermal resistance due to the phenomena described in 5.1 usually occurs over an extended period of time. Information regarding changes in the thermal resistance of these materials as a function of time is required in a shorter period of time so that decisions regarding formulations, production, and comparisons with other materials can be made.
Specifications C578, C591, C1029, C1126 and C1289 on rigid closed-cell foams measure thermal resistance after conditioning at 23 ± 1°C (73 ± 2°F) for 180 ± 5 days from the time of manufacture or at 60 ± 1°C (140 ± 2°F) for 90 days. This conditioning can be used for comparative purposes, but is not sufficient to describe long-term thermal resistance. This requirement demonstrates the importance of the aging phenomena within this class of products.
The Prescriptive Method in Part A provides long-term thermal resistance values on a consistent basis for a variety of purposes, including product evaluation, specifications, or product comparisons. The consistent basis for these purposes is provided by a series of specific procedural constraints, which are not required in the Research Method described in Part B. The values produced by the Prescriptive Method correspond to the thermal resistance at an age of five years, which corresponds closely to the average thermal resistance over a 15-year service life (7, 8).
It is recommended that any material stan......
ASTM C1303-09a Referenced Document
- ASTM C1029 Standard Specification for Spray-Applied Rigid Cellular Polyurethane Thermal Insulation
- ASTM C1045 Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
- ASTM C1126 Standard Specification for Faced or Unfaced Rigid Cellular Phenolic Thermal Insulation
- ASTM C1289 Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board
- ASTM C168 Standard Terminology Relating to Thermal Insulation
- ASTM C177 Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
- ASTM C518 Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
- ASTM C578 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation
- ASTM C591 Standard Specification for Unfaced Preformed Rigid Cellular Polyurethane Thermal Insulation
- ASTM D1622 Standard Test Method for Apparent Density of Rigid Cellular Plastics
- ASTM D6226 Standard Test Method for Open Cell Content of Rigid Cellular Plastics
- ASTM E122 Standard Practice for Calculating Sample Size to Estimate, With a Specified Tolerable Error, the Average for Characteristic of a Lot or Process
ASTM C1303-09a history
- 2023 ASTM C1303/C1303M-23 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2022 ASTM C1303/C1303M-22 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2019 ASTM C1303/C1303M-19 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2015 ASTM C1303/C1303M-15 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2014 ASTM C1303/C1303M-14 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2012 ASTM C1303/C1303M-12 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2011 ASTM C1303/C1303M-11a Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2011 ASTM C1303/C1303M-11 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2010 ASTM C1303/C1303M-10 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2009 ASTM C1303-09a Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2009 ASTM C1303-09 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2008 ASTM C1303-08e1 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2008 ASTM C1303-08 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2007 ASTM C1303-07 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
- 2000 ASTM C1303-00 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
