2024年4月8日发(作者：韶梓柔)
Designation:D5930
−
09
StandardTestMethodfor
ThermalConductivityofPlasticsbyMeansofaTransient
Line-SourceTechnique
1
ThisstandardisissuedunderthefixeddesignationD5930;thenumberimmediatelyfollowingthedesignationindicatestheyearof
originaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflastreapproval.A
superscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.
*
1.1Thistestmethodcoversthedeterminationofthethermal
conductivityofplasticsoveratemperaturerangefrom–40to
400°rmalconductivityofmaterialsintherangefrom
0.08to2.0W/measuredcoveringthermoplastics,
thermosets,andrubbers,filledandreinforced.
1.2ThevaluesstatedinSIunitsshallberegardedas
standard.
1.3Thisstandarddoesnotpurporttoaddressthesafety
concerns,ifany,eresponsibility
oftheuserofthisstandardtoestablishpropersafetyand
healthpracticesanddeterminetheapplicabilityofregulatory
limitationspriortouse.
N
OTE
1—ThereisnoknownISOequivalenttothistestmethod.
ology
3.1Definitions—Terminologyusedinthisstandardisin
accordancewithTerminology
D883.
3.2DefinitionsofTermsSpecifictoThisStandard:
3.2.1temperaturetransient,n—thetemperatureriseassoci-
atedwiththeperturbationofasystem,initiallyatauniform
temdoesnotattainthermalequilibrium
duringthetransient.
3.2.2thermalconductivity,n—thetimerateofsteadyheat
flow/unitareathroughunitthicknessofahomogeneousmate-
rialinadirectionperpendiculartothesurfaceinducedbyaunit
temperaturedifference.
3.2.2.1Discussion—Whereothermodesofheattransferare
presentinadditiontoconduction,suchasconvectionand
radiation,thispropertyoftenisreferredtoastheapparent
thermalconductivity,l
app
.
3.2.2.2Discussion—Thermalconductivitymustbeassoci-
atedwiththeconditionsunderwhichitismeasured,suchas
temperatureandpressure,aswellasthecompositionalvaria-
lconductivitymayvarywith
directionandorientationofthespecimensincesomematerials
caseofthermosetpolymers,thermalconductivitymayvary
withtheextentofcure.
3.2.3thermaldiffusivity—aheat-transportpropertygivenby
thethermalconductivitydividedbythethermalmass,whichis
aproductofthedensityandtheheatcapacity.
3.3Symbols:
3.3.1C—Probeconstant.
3.3.2l—Thermalconductivity,W/m.K.
3.3.3Q—Heatoutputperunitlength,W/m.
3.3.4T
2
—Thetemperature(K)recordedattimet
2
.
3.3.5T
1
—Thetemperature(K)recordedattimet
1
.
3.4Subscript:
3.4.1av—average.
3.4.2app—apparent.
3.4.3ref—reference.
ncedDocuments
2.1ASTMStandards:
2
C177TestMethodforSteady-StateHeatFluxMeasure-
mentsandThermalTransmissionPropertiesbyMeansof
theGuarded-Hot-PlateApparatus
C518TestMethodforSteady-StateThermalTransmission
PropertiesbyMeansoftheHeatFlowMeterApparatus
C1113TestMethodforThermalConductivityofRefracto-
riesbyHotWire(PlatinumResistanceThermometer
Technique)
D618PracticeforConditioningPlasticsforTesting
D883TerminologyRelatingtoPlastics
D2717TestMethodforThermalConductivityofLiquids
E177PracticeforUseoftheTermsPrecisionandBiasin
ASTMTestMethods
E1225TestMethodforThermalConductivityofSolidsby
MeansoftheGuarded-Comparative-LongitudinalHeat
FlowTechnique
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
andisthedirectresponsibilityofSubcommitteeD20.30onThermalProperties.
CurrenteditionapprovedAug.15,ally
:
10.1520/D5930-09.
2
ForreferencedASTMstandards,visittheASTMwebsite,,or
contactASTMCustomerServiceatservice@ualBookofASTM
Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon
theASTMwebsite.
1
*ASummaryofChangessectionappearsattheendofthisstandard
Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,States
char 12
Copyright by ASTM Int'l (all rights reserved); Mon Apr 22 06:55:22 EDT 2013
1
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Color red
D5930−09
yofTestMethod
4.1Line-SourceTechnique—Thisisatransientmethodfor
determiningthermalconductivity(1,2).
3
Alinesourceofheat
thecourse
ofthemeasurement,aknownamountofheatproducedbythe
line-sourceresultsinaheatwavepropagatingradiallyintothe
eofheatpropagationisrelatedtothethermal
peratureriseoftheline-
sourcevarieslinearlywiththelogarithmoftime(3).This
relationshipcanbeuseddirectlytocalculatethethermal
e-sourceofheatcanbe
testmethod,itisinthe
formofaprobeasdescribedin7.2.
ficanceandUse
5.1Therelativesimplicityofthetestmethodmakesit
applicableforawiderangeofmaterials(
4,5).Thetechnique
iscapableoffastmeasurements,makingitpossibletotakedata
atively,
itispossibletostudytheeffectofcompositionalchangessuch
aschemicalreactionoraging(6).Shortmeasurementtimes
permitgenerationoflargeamountsofdatawithlittleeffort.
Theline-sourceprobeandtheaccompanyingtestspecimenare
smallinsize,makingitpossibletosubjectthesampletoawide
ethistestmethoddoesnot
containanumericalprecisionandbiasstatement,itshallnotbe
usedasarefereetestmethodincaseofdispute.
erences
6.1Theline-sourcemethodproducesresultsofhighest
precisionwithmaterialswhereintimatecontactwiththeprobe
canbeestablished,therebyeliminatingeffectsofthermal
aterialsincludeviscousfluidsand
softsolids.
6.1.1Thermal-ContactResistance—Inthesolidstate,a
contactresistancecandevelopduetotheinterfacebetweenthe
tionalmethods
attempttoaccountforthisbyintroducingaconductivepaste
duces,butmay
noteliminate,ine-source
method,contactresistancemanifestsitselfasanonlinearityin
theinitialportionofthetransient(see
Fig.1).Thetechnique
nding
thetimeofthemeasurement,itispossibletoprogressbeyond
theregionofthermal-contactresistance,achievingastate
wherethecontactresistancedoesnotcontributetothemea-
suredtransient(
7).Thisstatetypicallyisachievedafterabout
gerthecontact
resistance,,therefore,importantto
makeasufficientlylongmeasurementtoexcludetheportionof
durationofmeasurement,however,cannotbetoolong,orelse
theheatwavecanstrikeasampleboundary,therebyviolating
thetheoreticalconditionsofthemeasurement.
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
thisstandard.
3
FIG.1Line-SourceTransient
6.1.2ShrinkageUponSolidification—Plasticstendtoshrink
significantlyuponsolidifirinkageisespeciallyso
forthesemi-crystallinematerials,whichexperienceasignifi-
cantchangeinspecifi
crystallizationcanresultinlargegapsbeingdevelopedbe-
untfor
shrinkage,asimplecompressionschemedescribedin
9.5can
permittheline-sourceprobetomovedownwardtotakeupthe
lsomustbetakentominimizespecimenvolume
soastoreducetheextentofshrinkage.
6.2Measurementsoninviscidfluidsaresubjecttothe
developmentofconvectioncurrentswhichcanaffectthe
eofthetransientnatureofthe
measurement,nnot
beeliminated,however.
6.3Althoughthetechniqueisnotlimitedbytemperature,at
measurementsabove500°C,asignificantamountofheat
transferoccursduetoradiationsothatonlyal
app
canbe
measured.
tus
7.1Theapparatusconsistsofaline-sourceprobeimbedded
inaspecimencontainedinaconstant-temperatureenviron-
themeasurement,theline-sourceprobeproduces
ultingtemperaturetransientis
recorded,preferably,onacomputerdata-acquisitionsystem,as
specifiansientisanalyzedtoobtainthethermal
conductivity.
7.2Line-SourceProbe—Theline-sourceprobecontainsa
heaterthatrunsthelengthoftheprobe(
3).Thelength-to-
resistanceoftheline-sourceheatermustbeknowntowithin
60.1%.Theprobealsocontainsatemperaturesensorto
alsensorforthe
line-sourceprobeisahigh-sensitivityJ-typethermocouple
sing
sheathoftheprobemustberobustenoughtoensurethatthe
probedoesnotbendordeformundertheadverseconditionsit
issubjecttoduringmeasurements.
char 12
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Color red
D5930−09
polymersamplestofoam,whichwillaffectthemeasured
ioningisgenerallynotarequire-
mentofthistest;ifconditioningisnecessary,seetheapplicable
materialspecificationorPractice
D618.
ationofTestSpecimen
9.1Thetestspecimenmaybepreparedfromsamples,which
canbeintheformofplasticpellets,liquids,foams,orsoft
cimen-preparationmethoddependsonthetype
aterialisbelievedtobe
anisotropic,ens
mustbelongerthantheline-sourceprobeandlargeenoughin
radiustohaveatleast4mmofmaterialsurroundingtheprobe,
sothattheexpandingheatwavewillnotstrikeaboundary
duringthemeasurement.
9.2ViscousLiquids—Theseincludepastesandsemisolids.
Pourorextrudethespecimenintoatesttubeorsimilar
tainermustbefilledwithsuffi-
cientquantityoffluidsuchthattheprobeisimmersed
completely.
9.3SoftSolids—Inserttheline-sourceprobedirectlyintothe
specimen,takingcaretoseethatitdoesnotbendduring
cimencanbeofanysizeorshapeaslongas
itislargerthantheminimumspecifiedin
asewhere
thespecimencannotbepenetratedwithoutbeingdestroyed,it
ispermissibletodrillapilotholethatissmallerthantheprobe
diametertoaidininsertion.
9.4ThermoplasticsintheMelt—Preheatthesamplecellto
thelowestmeltprocessingtemperatureofthethermoplastic.
Loadingspecimensatalowtemperatureisdesirabletoensure
hargeofthespecimen,typically
inpelletorpowderform,intothecellandcompressintoa
lcharges,tampedwell,maybe
neededtofiespecimeniswell
molten,inserttheprobesoastobeneartheaxialcenterofthe
gsystemsmaybeemployedtocontainthe
rmallyunstablematerials,followmaterial
manufacturers’recommendationsontemperatureexposure
limits.
9.5SolidThermoplastics—Loadthesampleinthesame
mannerasin
lowingprecautionarystepsareneeded
toaccountforshrinkageofthespecimenasitsolidifi
probeshallbefittedwithadynamicsealingsystempermitting
loadscanthen
beplacedontheprobetohelpmaintaincontactastheplastic
oadsoptimallywillapplyapressureof1to7
MPaonthespecimen.
9.6ThermosetsandRubber—Preheatthesamplecelltoa
loadingtemperature,abovetheglasstransition,wherethe
specimenisfluidenoughtobemoldedbutwillnotundergo
significantreaction(
6).Ifthesamplecellistobereused,wipe
thewallsofthecellwithathinlayerofareleaseagentsuchas
siliconeoiltopreventthecuredspecimenfrombondingtothe
orpourtheuncuredspecimeninthesamemanner
tresults,donotcoattheprobewithrelease
agentssincethismightaffectthetestresults.
7.3HeaterPowerSource—Thepowerinputtotheline-
cision
ofthevoltagesourcemustbewithin60.25%overtheentire
durationofthetest.
7.4RecordingDevice—Thetemperaturetransientfromthe
line-sourceprobeisrecordedforthedurationofthetest.A
temperaturemeasurementdevicewitharesolutionof0.1°Cis
eacquiredfor30to120sdependingonthe
ltemperaturerisesarebetween2and
10°quencyof
dataacquisitionmustbeatleastonceeverysecond.
7.5SpecimenEnvironment—Aconstant-temperatureenvi-
ronmentmustbemaintainedthroughthedurationofthetestso
astoprovideatemperaturestabilityinthespecimenofwithin
60.1°etoattainthiscriterioncancompromisethe
linearityofthetransient,
environmentshallbefreefromexcessivevibration.
7.5.1Ambient—Formeasurementsclosetoambient,a
stirredwaterbathmaybeusedtomaintainthetesttemperature.
Alternatively,thespecimen,adequatelyshieldedtoprotectit
fromconvection,maybeplacedinair.
7.5.2CryogenicTemperatures—Thespecimen,adequately
shieldedtoprotectitfromconvection,maybeplacedina
controlledcryogenicbathorchamber.
7.5.3ElevatedTemperatures—Attemperaturesabove
ambient,nsistsofa
verticalcylindricalheatedchamber,fittedwitharemovable
cimenisloadedfromthetopand
canbedischargedthroughthebottom,oncethetestiscomplete
(see
Fig.2).
ioning
8.1Manythermoplasticmaterialsmustbedriedbecause
recausesmolten
FIG.2AdaptationforMeasurementsatElevatedTemperatures
char 12
Copyright by ASTM Int'l (all rights reserved); Mon Apr 22 06:55:22 EDT 2013
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Color red
2024年4月8日发(作者：韶梓柔)
Designation:D5930
−
09
StandardTestMethodfor
ThermalConductivityofPlasticsbyMeansofaTransient
Line-SourceTechnique
1
ThisstandardisissuedunderthefixeddesignationD5930;thenumberimmediatelyfollowingthedesignationindicatestheyearof
originaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflastreapproval.A
superscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.
*
1.1Thistestmethodcoversthedeterminationofthethermal
conductivityofplasticsoveratemperaturerangefrom–40to
400°rmalconductivityofmaterialsintherangefrom
0.08to2.0W/measuredcoveringthermoplastics,
thermosets,andrubbers,filledandreinforced.
1.2ThevaluesstatedinSIunitsshallberegardedas
standard.
1.3Thisstandarddoesnotpurporttoaddressthesafety
concerns,ifany,eresponsibility
oftheuserofthisstandardtoestablishpropersafetyand
healthpracticesanddeterminetheapplicabilityofregulatory
limitationspriortouse.
N
OTE
1—ThereisnoknownISOequivalenttothistestmethod.
ology
3.1Definitions—Terminologyusedinthisstandardisin
accordancewithTerminology
D883.
3.2DefinitionsofTermsSpecifictoThisStandard:
3.2.1temperaturetransient,n—thetemperatureriseassoci-
atedwiththeperturbationofasystem,initiallyatauniform
temdoesnotattainthermalequilibrium
duringthetransient.
3.2.2thermalconductivity,n—thetimerateofsteadyheat
flow/unitareathroughunitthicknessofahomogeneousmate-
rialinadirectionperpendiculartothesurfaceinducedbyaunit
temperaturedifference.
3.2.2.1Discussion—Whereothermodesofheattransferare
presentinadditiontoconduction,suchasconvectionand
radiation,thispropertyoftenisreferredtoastheapparent
thermalconductivity,l
app
.
3.2.2.2Discussion—Thermalconductivitymustbeassoci-
atedwiththeconditionsunderwhichitismeasured,suchas
temperatureandpressure,aswellasthecompositionalvaria-
lconductivitymayvarywith
directionandorientationofthespecimensincesomematerials
caseofthermosetpolymers,thermalconductivitymayvary
withtheextentofcure.
3.2.3thermaldiffusivity—aheat-transportpropertygivenby
thethermalconductivitydividedbythethermalmass,whichis
aproductofthedensityandtheheatcapacity.
3.3Symbols:
3.3.1C—Probeconstant.
3.3.2l—Thermalconductivity,W/m.K.
3.3.3Q—Heatoutputperunitlength,W/m.
3.3.4T
2
—Thetemperature(K)recordedattimet
2
.
3.3.5T
1
—Thetemperature(K)recordedattimet
1
.
3.4Subscript:
3.4.1av—average.
3.4.2app—apparent.
3.4.3ref—reference.
ncedDocuments
2.1ASTMStandards:
2
C177TestMethodforSteady-StateHeatFluxMeasure-
mentsandThermalTransmissionPropertiesbyMeansof
theGuarded-Hot-PlateApparatus
C518TestMethodforSteady-StateThermalTransmission
PropertiesbyMeansoftheHeatFlowMeterApparatus
C1113TestMethodforThermalConductivityofRefracto-
riesbyHotWire(PlatinumResistanceThermometer
Technique)
D618PracticeforConditioningPlasticsforTesting
D883TerminologyRelatingtoPlastics
D2717TestMethodforThermalConductivityofLiquids
E177PracticeforUseoftheTermsPrecisionandBiasin
ASTMTestMethods
E1225TestMethodforThermalConductivityofSolidsby
MeansoftheGuarded-Comparative-LongitudinalHeat
FlowTechnique
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
andisthedirectresponsibilityofSubcommitteeD20.30onThermalProperties.
CurrenteditionapprovedAug.15,ally
:
10.1520/D5930-09.
2
ForreferencedASTMstandards,visittheASTMwebsite,,or
contactASTMCustomerServiceatservice@ualBookofASTM
Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon
theASTMwebsite.
1
*ASummaryofChangessectionappearsattheendofthisstandard
Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,States
char 12
Copyright by ASTM Int'l (all rights reserved); Mon Apr 22 06:55:22 EDT 2013
1
Downloaded/printed by
Font Times-Bold
UC San Diego pursuant to License Agreement. No further reproductions authorized.
Color red
D5930−09
yofTestMethod
4.1Line-SourceTechnique—Thisisatransientmethodfor
determiningthermalconductivity(1,2).
3
Alinesourceofheat
thecourse
ofthemeasurement,aknownamountofheatproducedbythe
line-sourceresultsinaheatwavepropagatingradiallyintothe
eofheatpropagationisrelatedtothethermal
peratureriseoftheline-
sourcevarieslinearlywiththelogarithmoftime(3).This
relationshipcanbeuseddirectlytocalculatethethermal
e-sourceofheatcanbe
testmethod,itisinthe
formofaprobeasdescribedin7.2.
ficanceandUse
5.1Therelativesimplicityofthetestmethodmakesit
applicableforawiderangeofmaterials(
4,5).Thetechnique
iscapableoffastmeasurements,makingitpossibletotakedata
atively,
itispossibletostudytheeffectofcompositionalchangessuch
aschemicalreactionoraging(6).Shortmeasurementtimes
permitgenerationoflargeamountsofdatawithlittleeffort.
Theline-sourceprobeandtheaccompanyingtestspecimenare
smallinsize,makingitpossibletosubjectthesampletoawide
ethistestmethoddoesnot
containanumericalprecisionandbiasstatement,itshallnotbe
usedasarefereetestmethodincaseofdispute.
erences
6.1Theline-sourcemethodproducesresultsofhighest
precisionwithmaterialswhereintimatecontactwiththeprobe
canbeestablished,therebyeliminatingeffectsofthermal
aterialsincludeviscousfluidsand
softsolids.
6.1.1Thermal-ContactResistance—Inthesolidstate,a
contactresistancecandevelopduetotheinterfacebetweenthe
tionalmethods
attempttoaccountforthisbyintroducingaconductivepaste
duces,butmay
noteliminate,ine-source
method,contactresistancemanifestsitselfasanonlinearityin
theinitialportionofthetransient(see
Fig.1).Thetechnique
nding
thetimeofthemeasurement,itispossibletoprogressbeyond
theregionofthermal-contactresistance,achievingastate
wherethecontactresistancedoesnotcontributetothemea-
suredtransient(
7).Thisstatetypicallyisachievedafterabout
gerthecontact
resistance,,therefore,importantto
makeasufficientlylongmeasurementtoexcludetheportionof
durationofmeasurement,however,cannotbetoolong,orelse
theheatwavecanstrikeasampleboundary,therebyviolating
thetheoreticalconditionsofthemeasurement.
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
thisstandard.
3
FIG.1Line-SourceTransient
6.1.2ShrinkageUponSolidification—Plasticstendtoshrink
significantlyuponsolidifirinkageisespeciallyso
forthesemi-crystallinematerials,whichexperienceasignifi-
cantchangeinspecifi
crystallizationcanresultinlargegapsbeingdevelopedbe-
untfor
shrinkage,asimplecompressionschemedescribedin
9.5can
permittheline-sourceprobetomovedownwardtotakeupthe
lsomustbetakentominimizespecimenvolume
soastoreducetheextentofshrinkage.
6.2Measurementsoninviscidfluidsaresubjecttothe
developmentofconvectioncurrentswhichcanaffectthe
eofthetransientnatureofthe
measurement,nnot
beeliminated,however.
6.3Althoughthetechniqueisnotlimitedbytemperature,at
measurementsabove500°C,asignificantamountofheat
transferoccursduetoradiationsothatonlyal
app
canbe
measured.
tus
7.1Theapparatusconsistsofaline-sourceprobeimbedded
inaspecimencontainedinaconstant-temperatureenviron-
themeasurement,theline-sourceprobeproduces
ultingtemperaturetransientis
recorded,preferably,onacomputerdata-acquisitionsystem,as
specifiansientisanalyzedtoobtainthethermal
conductivity.
7.2Line-SourceProbe—Theline-sourceprobecontainsa
heaterthatrunsthelengthoftheprobe(
3).Thelength-to-
resistanceoftheline-sourceheatermustbeknowntowithin
60.1%.Theprobealsocontainsatemperaturesensorto
alsensorforthe
line-sourceprobeisahigh-sensitivityJ-typethermocouple
sing
sheathoftheprobemustberobustenoughtoensurethatthe
probedoesnotbendordeformundertheadverseconditionsit
issubjecttoduringmeasurements.
char 12
Copyright by ASTM Int'l (all rights reserved); Mon Apr 22 06:55:22 EDT 2013
2
Downloaded/printed by
Font Times-Bold
UC San Diego pursuant to License Agreement. No further reproductions authorized.
Color red
D5930−09
polymersamplestofoam,whichwillaffectthemeasured
ioningisgenerallynotarequire-
mentofthistest;ifconditioningisnecessary,seetheapplicable
materialspecificationorPractice
D618.
ationofTestSpecimen
9.1Thetestspecimenmaybepreparedfromsamples,which
canbeintheformofplasticpellets,liquids,foams,orsoft
cimen-preparationmethoddependsonthetype
aterialisbelievedtobe
anisotropic,ens
mustbelongerthantheline-sourceprobeandlargeenoughin
radiustohaveatleast4mmofmaterialsurroundingtheprobe,
sothattheexpandingheatwavewillnotstrikeaboundary
duringthemeasurement.
9.2ViscousLiquids—Theseincludepastesandsemisolids.
Pourorextrudethespecimenintoatesttubeorsimilar
tainermustbefilledwithsuffi-
cientquantityoffluidsuchthattheprobeisimmersed
completely.
9.3SoftSolids—Inserttheline-sourceprobedirectlyintothe
specimen,takingcaretoseethatitdoesnotbendduring
cimencanbeofanysizeorshapeaslongas
itislargerthantheminimumspecifiedin
asewhere
thespecimencannotbepenetratedwithoutbeingdestroyed,it
ispermissibletodrillapilotholethatissmallerthantheprobe
diametertoaidininsertion.
9.4ThermoplasticsintheMelt—Preheatthesamplecellto
thelowestmeltprocessingtemperatureofthethermoplastic.
Loadingspecimensatalowtemperatureisdesirabletoensure
hargeofthespecimen,typically
inpelletorpowderform,intothecellandcompressintoa
lcharges,tampedwell,maybe
neededtofiespecimeniswell
molten,inserttheprobesoastobeneartheaxialcenterofthe
gsystemsmaybeemployedtocontainthe
rmallyunstablematerials,followmaterial
manufacturers’recommendationsontemperatureexposure
limits.
9.5SolidThermoplastics—Loadthesampleinthesame
mannerasin
lowingprecautionarystepsareneeded
toaccountforshrinkageofthespecimenasitsolidifi
probeshallbefittedwithadynamicsealingsystempermitting
loadscanthen
beplacedontheprobetohelpmaintaincontactastheplastic
oadsoptimallywillapplyapressureof1to7
MPaonthespecimen.
9.6ThermosetsandRubber—Preheatthesamplecelltoa
loadingtemperature,abovetheglasstransition,wherethe
specimenisfluidenoughtobemoldedbutwillnotundergo
significantreaction(
6).Ifthesamplecellistobereused,wipe
thewallsofthecellwithathinlayerofareleaseagentsuchas
siliconeoiltopreventthecuredspecimenfrombondingtothe
orpourtheuncuredspecimeninthesamemanner
tresults,donotcoattheprobewithrelease
agentssincethismightaffectthetestresults.
7.3HeaterPowerSource—Thepowerinputtotheline-
cision
ofthevoltagesourcemustbewithin60.25%overtheentire
durationofthetest.
7.4RecordingDevice—Thetemperaturetransientfromthe
line-sourceprobeisrecordedforthedurationofthetest.A
temperaturemeasurementdevicewitharesolutionof0.1°Cis
eacquiredfor30to120sdependingonthe
ltemperaturerisesarebetween2and
10°quencyof
dataacquisitionmustbeatleastonceeverysecond.
7.5SpecimenEnvironment—Aconstant-temperatureenvi-
ronmentmustbemaintainedthroughthedurationofthetestso
astoprovideatemperaturestabilityinthespecimenofwithin
60.1°etoattainthiscriterioncancompromisethe
linearityofthetransient,
environmentshallbefreefromexcessivevibration.
7.5.1Ambient—Formeasurementsclosetoambient,a
stirredwaterbathmaybeusedtomaintainthetesttemperature.
Alternatively,thespecimen,adequatelyshieldedtoprotectit
fromconvection,maybeplacedinair.
7.5.2CryogenicTemperatures—Thespecimen,adequately
shieldedtoprotectitfromconvection,maybeplacedina
controlledcryogenicbathorchamber.
7.5.3ElevatedTemperatures—Attemperaturesabove
ambient,nsistsofa
verticalcylindricalheatedchamber,fittedwitharemovable
cimenisloadedfromthetopand
canbedischargedthroughthebottom,oncethetestiscomplete
(see
Fig.2).
ioning
8.1Manythermoplasticmaterialsmustbedriedbecause
recausesmolten
FIG.2AdaptationforMeasurementsatElevatedTemperatures
char 12
Copyright by ASTM Int'l (all rights reserved); Mon Apr 22 06:55:22 EDT 2013
3
Downloaded/printed by
Font Times-Bold
UC San Diego pursuant to License Agreement. No further reproductions authorized.
Color red