ASTM_E_1530_-_11.pdf

Designation:E153011Standard Test Method forEvaluating the Resistance to Thermal Transmission ofMaterials by the Guarded Heat Flow Meter Technique1This standard is issued under the fixed designation E1530;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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a steady-state technique for thedetermination of the resistance to thermal transmission(ther-mal resistance)of materials of thicknesses less than 25 mm.For homogeneous opaque solid specimens of a representativethickness,thermal conductivity can be determined(see Note1).This test method is useful for specimens having a thermalresistance in the range from 10 to 400 10-4m2KW-1,whichcan be obtained from materials of thermal conductivity in theapproximate range from 0.1 to 30 Wm-1K-1over the approxi-mate temperature range from 150 to 600 K.It can be usedoutside these ranges with reduced accuracy for thicker speci-mens and for thermal conductivity values up to 60 Wm-1K-1.NOTE1A body is considered homogeneous when the property to bemeasured is found to be independent of specimen dimensions.1.2 This test method is similar in concept to Test MethodC518,but is modified to accommodate smaller test specimens,having a higher thermal conductance.In addition,significantattention has been paid to ensure that the thermal resistance ofcontacting surfaces is minimized and reproducible.1.3 The values stated in SI units are to be regarded asstandard.The additional values are mathematical conversionsto inch-pound units that are provided for information only andare not considered standard.1.4 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.Related Documents2.1 ASTM Standards:2C518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC1045 Practice for Calculating Thermal Transmission Prop-erties Under Steady-State ConditionsE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE1142 Terminology Relating to Thermophysical PropertiesE1225 Test Method for Thermal Conductivity of SolidsUsing the Guarded-Comparative-Longitudinal Heat FlowTechniqueF104 Classification System for Nonmetallic Gasket Materi-alsF433 Practice for Evaluating Thermal Conductivity of Gas-ket Materials3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 heat flux transducer(HFT)a device that produces anelectrical output that is a function of the heat flux,in apredefined and reproducible manner.3.1.2 thermal conductance(C)the time rate of heat fluxthrough a unit area of a body induced by unit temperaturedifference between the body surfaces.3.1.2.1 average temperature of a surfacethe area-weighted mean temperature of that surface.3.1.2.2 average(mean)temperature of a specimen(discshaped)the mean value of the upper and lower face tempera-tures.3.1.3 thermal conductivity()(of a solid material)thetime rate of heat flow,under steady conditions,through unitarea,per unit temperature gradient in the direction perpendicu-lar to the area:3.1.3.1 apparent thermal conductivitywhen other modesof heat transfer through a material are present in addition toconduction,the results of the measurements performed inaccordance with this test method will represent the apparent oreffective thermal conductivity for the material tested.3.1.4 thermal resistance(R)the reciprocal of thermal con-ductance.3.2 Symbols:1This test method is under the jurisdiction ofASTM Committee E37 on ThermalMeasurements and is the direct responsibility of Subcommittee E37.05 on Thermo-physical Properties.Current edition approved Aug.15,2011.Published September 2011.Originallyapproved in 1993.Last previous edition approved in 2006 as E1530 06.DOI:10.1520/E1530-11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.1 thermal conductivity,Wm-1K-1or Btuin.h-1ft-2F-1.3.2.2 Cthermal conductance,Wm-2K-1or Btuh-1ft-2F-1.3.2.3 Rthermal resistance,m2KW-1or hft2FBtu-1.3.2.4 xspecimen thickness,mm or in.3.2.5 Aspecimen cross-sectional area,m2or ft2.3.2.6 Qheat flow,W or Btuh-1.3.2.7 heat flux transducer output,mV.3.2.8 Nheat flux transducer calibration constant,Wm-2mV-1or Btuh-1ft-2mV-1.3.2.9 Nheat flux,Wm2or Btuh-1ft2.3.2.10 Ttemperature difference,C or F.3.2.11 Tgtemperature of guard heater,C or F.