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Designation:D792−13StandardTestMethodsforDensityandSpecificGravity(RelativeDensity)ofPlasticsbyDisplacement1ThisstandardisissuedunderthefixeddesignationD792;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thesetestmethodsdescribethedeterminationofthespecificgravity(relativedensity)anddensityofsolidplasticsinformssuchassheets,rods,tubes,ormoldeditems.1.2Twotestmethodsaredescribed:1.2.1TestMethodA—Fortestingsolidplasticsinwater,and1.2.2TestMethodB—Fortestingsolidplasticsinliquidsotherthanwater.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThisstandardisnotequivalenttoISO1183–1MethodA.Thistestmethodprovidesmoreguidelinesonsampleweightanddimension.ISO1183-1allowstestingatanadditionaltemperatureof2762°C.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD891TestMethodsforSpecificGravity,Apparent,ofLiquidIndustrialChemicalsD4968GuideforAnnualReviewofTestMethodsandSpecificationsforPlasticsD6436GuideforReportingPropertiesforPlasticsandThermoplasticElastomersE1SpecificationforASTMLiquid-in-GlassThermometersE12TerminologyRelatingtoDensityandSpecificGravityofSolids,Liquids,andGases(Withdrawn1996)3E691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodIEEE/ASTMSI-10PracticeforUseoftheInternationalSystemofUnits(SI)(theModernizedMetricSystem)3.Terminology3.1General—Theunits,symbols,andabbreviationsusedinthesetestmethodsareinaccordancewithIEEE/ASTMSI-10.3.2Definitions:3.2.1specificgravity(relativedensity)—theratioofthemassofagivenvolumeoftheimpermeableportionofthematerialat23°Ctothemassofanequalvolumeofgas-freedistilledorde-mineralizedwateratthesametemperature;theformofexpressionshallbe:Specificgravity~relativedensity!23/23°C~orspgr23/23°C!NOTE2—ThisdefinitionisessentiallyequivalenttothedefinitionforapparentspecificgravityandapparentdensityinTerminologyE12,becausethesmallpercentagedifferenceintroducedbynotcorrectingforthebuoyancyofairisinsignificantformostpurposes.3.2.2density—cubicmetreofimpermeableportionofthematerialat23°C.Theformofexpressionshallbe:D23,kg/m3NOTE3—TheSIunitofdensity,asdefinedinIEEE/ASTMSI-10,iskg/m3.Toconvertdensitying/cm3todensityinkg/m3,multiplyby1000.NOTE4—Toconvertspecificgravity23/23°Ctodensity23°C,kg/m3,usethefollowingequation:D23C,kg/m35spgr23/23°C3997.5Where997.5kg/m3isthedensityofwaterat23°C.4.SummaryofTestMethod4.1Determinethemassofaspecimenofthesolidplasticinair.Itisthenimmersedinaliquid,itsapparentmassuponimmersionisdetermined,anditsspecificgravity(relativedensity)calculated.1ThesetestmethodsareunderthejurisdictionofASTMCommitteeD20onPlasticsandarethedirectresponsibilityofSubcommitteeD20.70onAnalyticalMethods(SectionD20.70.01).CurrenteditionapprovedNov.1,2013.PublishedNovember2013.Originallyapprovedin1944.Lastpreviouseditionapprovedin2008asD792-08.DOI:10.1520/D0792-13.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3Thelastapprovedversionofthishistoricalstandardisreferencedon*ASummaryofChangessectionappearsattheendofthisstandardCopyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates1CopyrightASTMInternational--``,`````,``,``,`,,`,,```````,,-`-`,,`,,`,`,,`---5.SignificanceandUse5.1Thespecificgravityordensityofasolidisapropertythatisconvenientlymeasuredtoidentifyamaterial,tofollowphysicalchangesinasample,toindicatedegreeofuniformityamongdifferentsamplingunitsorspecimens,ortoindicatetheaveragedensityofalargeitem.5.2Changesindensityofasinglematerialareduetolocalizeddifferencesincrystallinity,lossofplasticizer,absorp-tionofsolvent,ortoothercauses.Itispossiblethatportionsofasampledifferindensitybecauseoftheirdifferencesincrystallinity,thermalhistory,porosity,andcomposition(typesorproportionsofresin,plasticizer,pigment,orfiller).5.3Densityisusefulforcalculatingstrength-weightandcost-weightratios.6.Sampling6.1Thesamplingunitsusedforthedeterminationofspe-cificgravity(relativedensity)shallberepresentativeofthequantityofproductforwhichthedataarerequired.6.1.1Ifitisknownorsuspectedthatthesampleconsistsoftwoormorelayersorsectionshavingdifferentspecificgravities,eithercompletefinishedpartsorcompletecrosssectionsofthepartsorshapesshallbeusedasthespecimens,orseparatespecimensshallbetakenandtestedfromeachlayer.Thespecificgravity(relativedensity)ofthetotalpartshallnotbeobtainedbyaddingthespecificgravityofthelayers,unlessre
本文标题:ASTM-D792-13-用位移法测定塑料密度和比重的标准试验方法
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