ASTM C1303-2009 Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation.pdf

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1、Designation: C1303 09Standard Test Method forPredicting Long-Term Thermal Resistance of Closed-CellFoam Insulation1This standard is issued under the fixed designation C1303; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year

2、of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a procedure for predicting thelong-term thermal resistance (LTTR) of unfaced or permeablyfa

3、ced rigid gas-filled closed-cell foam insulations by reducingthe specimen thickness to accelerate aging under controlledlaboratory conditions (1-5) .21.2 Rigid gas-filled closed-cell foam insulation includes allcellular plastic insulations manufactured with the intent toretain a blowing agent other

4、than air.1.3 This test method is limited to unfaced or permeablyfaced, homogeneous materials. This method is applied to awide range of rigid closed-cell foam insulation types, includingbut not limited to: extruded polystyrene, polyurethane, poly-isocyanurate, and phenolic. This test method does not

5、apply toimpermeably faced rigid closed-cell foams or to rigid closed-cell bun stock foams.NOTE 1See Note 7 for more details regarding the applicability of thistest method to rigid closed-cell bun stock foams.1.4 This test method utilizes referenced standard test proce-dures for measuring thermal res

6、istance. Periodic measurementsare performed on specimens to observe the effects of aging.Specimens of reduced thickness (that is, thin slices) are used toshorten the time required for these observations. The results ofthese measurements are used to predict the long-term thermalresistance of the mate

7、rial.1.5 The test method is given in two parts. The PrescriptiveMethod in Part A provides long-term thermal resistance valueson a consistent basis that can be used for a variety of purposes,including product evaluation, specifications, or product com-parisons. The Research Method in part B provides

8、a generalrelationship between thermal conductivity, age, and productthickness.1.5.1 To use the Prescriptive Method, the date of manufac-ture must be known, which usually involves the cooperation ofthe manufacturer.1.6 The values stated in SI units are to be regarded as thestandard. The inch-pound va

9、lues given in parentheses are forinformation only.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of r

10、egulatory limitations prior to use.1.8 Table of Contents:SectionScope 1Reference Documents 2Terminology 3Summary of Test Method 4Significance and Use 5Part A: The Prescriptive Method 6Applicability 6.1Qualification Requirements 6.1.1Facing Permeability 6.1.2Apparatus 6.2Sampling 6.3Schedule 6.3.1Rep

11、resentative Replicate Product Sheets 6.3.2Replicate Test Specimen Sets 6.3.3Specimen Preparation 6.4Goal 6.4.1Schedule 6.4.2Specimen Extraction 6.4.3Slice Flatness 6.4.4Slice Thickness 6.4.5Stack Composition 6.4.6Storage Conditioning 6.5Test Procedure 6.6Thermal Resistance Measurement Schedule 6.6.1

12、Thermal Resistance Measurements 6.6.2Product Density 6.6.3Calculations 6.7Part B: The Research Method 7Background 7.1TDSL Apparatus 7.2Sampling Schedule 7.3Specimen Preparation 7.4Storage Conditioning 7.5Test Procedure 7.6Calculations 7.7Reporting 8Reporting for Part A, the Prescriptive Method 8.1Re

13、porting for Part B, the Research Method 8.2Precision and Bias 9Keywords 10Mandatory Information Qualification Annex A1Specimen Preparation A1.1Homogeneity Qualification A1.2Aging Equivalence Test Procedure A1.31This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and

14、is the direct responsibility of Subcommittee C16.30 on ThermalMeasurement.Current edition approved Nov. 1, 2009. Published December 2009. Originallyapproved in 1995. Last previous edition approved in 2008 as C1303 081. DOI:10.1520/C1303-09.2The boldface numbers in parentheses refer to the list of re

15、ferences at the end ofthis standard.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Alternate Product Thickness Qualification A1.4Example Calculations A1.5Mandatory Information-Preparation of TestSpecimens for Spray-Foam ProductsAnne

16、x A2Effect Of TDSL AppendixX1History of the Standard AppendixX2Theory of Foam Aging AppendixX3References2. Referenced Documents2.1 ASTM Standards:3C168 Terminology Relating to Thermal InsulationC177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means oft

17、he Guarded-Hot-Plate ApparatusC518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC578 Specification for Rigid, Cellular Polystyrene ThermalInsulationC591 Specification for Unfaced Preformed Rigid CellularPolyisocyanurate Thermal InsulationC1029

18、Specification for Spray-Applied Rigid Cellular Poly-urethane Thermal InsulationC1045 Practice for Calculating Thermal Transmission Prop-erties Under Steady-State ConditionsC1126 Specification for Faced or Unfaced Rigid CellularPhenolic Thermal InsulationC1289 Specification for Faced Rigid Cellular P

19、olyisocya-nurate Thermal Insulation BoardD1622 Test Method for Apparent Density of Rigid CellularPlasticsD6226 Test Method for Open Cell Content of Rigid CellularPlasticsE122 Practice for Calculating Sample Size to Estimate,With Specified Precision, the Average for a Characteristicof a Lot or Proces

20、s2.2 Other Standards:CAN/ULC S770 Standard Test Method for Determinationof Long-Term Thermal Resistance of Closed-Cell Ther-mal Insulation Foams42.3 ASTM Adjuncts:Test Method for Predicting Long-Term Thermal Resistanceof Closed-Cell Foam Insulation53. Terminology3.1 DefinitionsFor definitions of ter

21、ms and symbols usedin this test method, refer to Terminology C168.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging, vthe change in thermophysical properties ofrigid closedcell plastic foam with time, primarily due tochanges in the composition of the gas contained within theclosed cells

22、.3.2.2 core slice, na thin-slice foam specimen that wastaken at least 5 mm (0.2 in.) or 25 % of the product thickness,whichever is greater, away from the surface of the full-thickness product.3.2.3 effective diffusion thickness, none-half of the geo-metric thickness minus the total thickness of dama

23、ged surfacelayer(s) (TDSL).3.2.4 facing, na material adhered to the surface of foaminsulation, including any foam product that has been suffusedinto the facing material, but not inclusive of any skin formedby the foam insulation itself.3.2.5 homogeneous material, nsufficiently uniform instructure an

24、d composition to meet the requirements of this testmethod (see A1.2).3.2.6 long-term, adjfor the purposes of the PrescriptiveMethod, long term refers to five years.3.2.7 normalized service life, nproduct service life di-vided by the square of the full product thickness, units oftime/length2.3.2.8 sc

25、aled time, ntime divided by the square of thespecimen thickness.3.2.9 scaled service life, ntime necessary for a thinspecimen to reach the same thermal conductivity that a fullthickness specimen would reach at the end of its service life,equals the product service life multiplied by the square of th

26、eratio of the average slice thickness to the full product thickness,value has units of time.3.2.10 service life, nthe anticipated period of time that thematerial is expected to maintain claimed thermophysical prop-erties, may be dependent on the specific end-use application.3.2.11 surface slice, na

27、thin-slice foam specimen that wasoriginally adjacent to the surface of the full-thickness productand that includes any facing that was adhered to the surface ofthe original full-thickness product.3.2.12 thickness of damaged surface layer (TDSL), ntheaverage thickness of surface cells, on one surface

28、, that areeither destroyed (ruptured or opened) during the preparation oftest specimens or were originally open due to the manufactur-ing process.3.3 Symbols:i = counter used in a summationk = thermal conductivity, W/(mK)n = counter used in a summationN = number of cut planar surfacesnSL= counter in

29、 a time series that corresponds to the servicelife.R = thermal resistance, (m2K)/WTDSL = average thickness of damaged surface layer, mDXeff= effective diffusion thickness of thermal resistancespecimen, m4. Summary of Test Method4.1 Rigid gas-filled closed-cell foam insulation is thin-slicedto reduce

30、 the gas diffusion path length which accelerates the3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Underwri

31、ters Laboratory of Canada, 333 Pfingsten Road, Northbrook, IL60062-2096 USA,www.ulc.ca5Available from ASTM International Headquarters. Order Adjunct No.ADJC1303.C1303 092aging process. The resulting temporal acceleration is propor-tional to the square of the ratio of the product use thickness tothe

32、slice thickness.4.2 Careful and precise slice preparation is necessary andthe process is described in detail in 6.4.4.3 In PartA, the Prescriptive Method, specific test dates arecalculated and the thermal resistance of the thin slices ismeasured on those dates.4.3.1 Qualification tests are included

33、to determine whetherthis method is applicable to a given material.4.4 In Part B, the Research Method, thermal conductivity ismeasured for a series of time periods and extensive dataanalysis is possible.5. Significance and Use5.1 Rigid gas-filled closed-cell foam insulations include allcellular plast

34、ic insulations which rely on a blowing agent (orgas), other than air, for thermal resistance values.At the time ofmanufacture, the cells of the foam usually contain their highestpercentage of blowing agent and the lowest percentage ofatmospheric gases. As time passes, the relative concentrationsof t

35、hese gases change due primarily to diffusion. This results ina general reduction of the thermal resistance of the foam due toan increase in the thermal conductivity of the resultant cell gasmixture. These phenomena are typically referred to as foamaging.5.1.1 For some rigid gas-filled closed-cell fo

36、am insulationproducts produced using blowing agent gases that diffuse veryrapidly out of the full-thickness foam product, such as ex-panded polystyrene, there is no need to accelerate the agingprocess.5.1.2 Physical gas diffusion phenomena occur in threedimensions. The one-dimensional form of the di

37、ffusion equa-tions used in the development of this practice are valid only forplanar geometries, that is, for specimens that have parallelfaces and where the thickness is much smaller than the widthand much smaller than the length.NOTE 2Please see Appendix X3 for a discussion of the theory ofacceler

38、ated aging via thin slicing.NOTE 3Theoretical and experimental evaluations of the aging ofinsulation in radial forms, such as pipe insulation, have been made. (6)However, these practices have not evolved to the point of inclusion in thetest standard.5.2 The change in thermal resistance due to the ph

39、enomenadescribed in 5.1 usually occurs over an extended period oftime. Information regarding changes in the thermal resistanceof these materials as a function of time is required in a shorterperiod of time so that decisions regarding formulations, pro-duction, and comparisons with other materials ca

40、n be made.5.3 Specifications C578, C591, C1029, C1126 and C1289on rigid closed-cell foams measure thermal resistance afterconditioning at 23 6 1C (73 6 2F) for 180 6 5 days fromthe time of manufacture or at 60 6 1C (140 6 2F) for 90days. This conditioning can be used for comparative purposes,but is

41、not sufficient to describe long-term thermal resistance.This requirement demonstrates the importance of the agingphenomena within this class of products.5.4 The Prescriptive Method in Part A provides long-termthermal resistance values on a consistent basis for a variety ofpurposes, including product

42、 evaluation, specifications, or prod-uct comparisons. The consistent basis for these purposes isprovided by a series of specific procedural constraints, whichare not required in the Research Method described in Part B.The values produced by the Prescriptive Method correspond tothe thermal resistance

43、 at an age of five years, which corre-sponds closely to the average thermal resistance over a 15-yearservice life (7, 8).5.4.1 It is recommended that any material standard thatrefers to C1303 to provide a product rating for long-termthermal resistance specify the Part A Test Method of C1303.5.5 The

44、Research Method in Part B provides a relationshipbetween thermal conductivity, age, and product thickness. Thecalculation methods given in Part B can be used to predict theresistance at any specific point in time as well as the averageresistance over a specific time period.NOTE 4The 5-year aged valu

45、es produced in Part A can be derivedfrom the Part B data only if all other Part A requirements are met.5.6 This test method addresses three separate elementsrelating to the aging of rigid closed-cell plastic foams.5.6.1 Specimen PreparationTechniques for the prepara-tion of thin flat specimens, incl

46、uding their extraction from the“as manufactured” product, and the measurement of specimenthickness are discussed.5.6.2 Measurement of the Thermal ResistanceThermalresistance measurements, taken at scheduled times, are anintegral part of the test method.5.6.3 Interpretation of DataProcedures are incl

47、uded toproperly apply the theory and techniques to achieve the desiredgoals.6. Part A: The Prescriptive Method6.1 Applicability:6.1.1 Qualification RequirementsBefore reporting the re-sults from a C1303 Part A aging test, the material must bequalified using the procedures given in Annex A1.6.1.1.1 T

48、he qualification requirement tests must be per-formed whenever a significant change that would affect thethermal resistance properties is made to the product.6.1.1.2 The qualification is valid for a period not to exceedtwo years.NOTE 5This test method is founded upon gas diffusion physical lawsthat

49、apply to homogeneous materials with free surface exposure to theatmosphere as discussed more fully in Appendix X3 (2-4) and (9-11).Although rigid closed-cell foam insulation may not rigorously meet thesehomogeneity and exposure criteria, this test method has been shown toprovide useful information for a wide range of products. Recognizing thatnone of the foam insulation products available today is perfectly homo-geneous, the qualification requirements determine whether the product issufficiently homogeneous for this test method to produce meaningfulre