ASTM_C_653_-_17.pdf

Designation:C65317Standard Guide forDetermination of the Thermal Resistance of Low-DensityBlanket-Type Mineral Fiber Insulation1This standard is issued under the fixed designation C653;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 guide describes the calculation and interpolation ofa thermal resistance value for low-density blanket-type insula-tion material at a particular density and thickness having beenselected as representative of the product.It requires measuredvalues of this average density and thickness,as well asapparent thermal conductivity values determined by either TestMethod C177,C518,or C1114.1.2 This guide applies to a density range for mineral-fibermaterial of roughly 6.4 to 48 kg/m3(0.4 to 3.0 lb/ft3).It isprimarily intended to apply to low-density,mineral-fiber massinsulation batts and blankets,exclusive of any membranefacings.Apparent thermal conductivity data for these productsare commonly reported at a mean temperature of 23.9C(75F)and a hot-to-cold plate temperature difference of 27.8C(50F)or 22.2C(40F).1.3 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:2C167 Test Methods for Thickness and Density of Blanket orBatt Thermal InsulationsC168 Terminology Relating to Thermal InsulationC177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC687 Practice for Determination of Thermal Resistance ofLoose-Fill Building InsulationC1045 Practice for Calculating Thermal Transmission Prop-erties Under Steady-State ConditionsC1114 Test Method for Steady-State Thermal TransmissionProperties by Means of the Thin-Heater Apparatus3.Terminology3.1 DefinitionsFor definitions used in this guide,refer toTerminology C168.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent thermal conductivity,the ratio of thespecimen thickness to thermal resistance of the specimen.It iscalculated as follows:5 L/RW/mk!orBtuin./ft2hF!(1)3.2.1.1 DiscussionFor this type of material an expressionfor the apparent thermal conductivity as a function of densityis:5 a1bD1c/D(2)where a,b,c=parameters characteristic of a product,and related to the conductivity of the gas,the conductivityof the solid and the conductivity due to radiation(1).33.3 Symbols:R=thermal resistance,(m2K/W)or(hft2F/Btu)=apparent thermal conductivity,(W/mK)or(Btuin/hft2F)Q/A=heat flow per unit area,(W/m2)or(Btu/hft2)D=bulk density of a specimen,(kg/m3)or(lb/ft3)L=measured specimen thickness,(m)or(in.)T=apparatus plate temperature,(K)or(F)L=specimen thickness if the sample from which thespecimen is selected does not recover to labelthickness,(m)or(in.)s=estimate of the standard deviation for a set of datapoints=apparatus systematic error=overall uncertainty in a measured R-value1This guide is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.30 on ThermalMeasurement.Current edition approved March 1,2017.Published March 2017.Originallyapproved in 1970.Last previous edition approved in 2012 as C653 97(2012).DOI:10.1520/C0653-17.2For 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.3The boldface numbers in parentheses refer to a list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.3.1 Subscripts:av=signifies average of a lotH=refers to hot surfaceC=refers to cold surfaceT=refers to test specimenN=refers to nominal property for the product,as shown onthe product labeli=refers to a set of data pointss=refers to a particular specimen4.Significance and Use4.1 This guide provides a method to determine the thermalperformance of low-density blanket-type insulation.It may beused for the purposes of quality assurance,certification,orresearch.4.2 The thermal resistance of low-density insulation de-pends