ASTM_D_7024_-_04.pdf

Designation:D 7024 04Standard Test Method forSteady State and Dynamic Thermal Performance of TextileMaterials1,2This standard is issued under the fixed designation D 7024;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the overallthermal transmission coefficient due to conduction for dryspecimens of textile fabrics,battings,and other materials andthe determination of the temperature regulating factor(TRF)defined below.1.2 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 regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D 123 Terminology Relating to TextilesD 1518 Test Method for Thermal Transmittance of TextileMaterialsD 1776 Practice for Conditioning and Testing TextilesD 1777 Method for Measuring Thickness of Textile Mate-rials3.Terminology3.1 Definitions:3.1.1 temperature difference,DTtemperature differencebetween two surfaces of a fabric,C.3.1.2 temperature regulating factor,TRFamplitude of thetemperature variation of the hot plate divided by the product ofthe amplitude of the hot plate flux variation and the steady stateR-value,all determined according to the test protocol describedbelow.The temperature regulating factor is useful in compar-ing fabrics that store and release energy and thereby regulatetheir surface temperature.3.2 For definitions of other textile terms used in this methodrefer to Terminology D 123.4.Summary of Test Method4.1 In order to determine the steady state R-value and thetemperature regulating for a sample fabric,the apparatus ofFig.1 is used.Fabric is sandwiched between a hot plate andtwo cold plates,one on either side of the hot plate.Acontrolledflux,either constant or varying,is maintained for the hot platewhile the cold plates are maintained at constant temperature.To measure the steady state thermal resistance(R-value)of thefabric,the controlled flux is constant and the test proceeds untilsteady state is reached.To measure the temperature regulatingfactor(TRF),the flux is varied sinusoidally with time.5.Significance and Use5.1 This method provides for the determination of thesteady state thermal resistance of a fabric or layers of fabricsand for the determination of the temperature regulating factor(TRF)as defined below.This test method is consideredsatisfactory for acceptance testing of commercial shipmentsbecause the round robin testing shows high precision and nobias for testing of textile fabrics and foams.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative test should be performed to determine if there is astatistical bias between them,using competent statistical assis-tance.As a minimum,use the samples for such a comparativetest that are as homogeneous as possible,drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing and randomly assigned in equal numbersto each laboratory.The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data,a probability level chosen prior to the testingseries.If bias is found,either its cause must be found andcorrected,or future test results for that material must beadjusted in consideration of the known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.51 on Chemical Conditioningand Performance.Current edition approved March 1,2004.Published April 2004.2The test apparatus described below is covered by a patent.Interested parties areinvited to submit information regarding the identification of an alternative(s)to thispatented item to theASTM International Headquarters.Your comments will receivecareful consideration at a meeting of the responsible technical committee,whichyou may attend.3For 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.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.5.2 This test method is useful in quality and cost controlduring manufacture.It can be used to establish criteria forestablishing thermal and comfort parameters for textiles par-ticularly used in the clothing industry.6.ApparatusNOTE1The drawings and illustrations are intended as suggesteddesigns only.The final design of equipment,including necessary wi