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1、Designation:D6980?17StardTestMethodfDeterminationofMoistureinPlasticsbyLossinWeight1ThisstardisissuedunderthefixeddesignationD6980thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevi

2、siontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodcoversthequantitativedeterminationofmoisturebym

3、eansoflossinweighttechnologydownto50mgkg(50ppm)asitappliestomostplastics.1.2ThevaluesstatedinSIunitsaretoberegardedasthestard.1.3Specimenstestedbythismethodwillbehotusecautionwhenhlingthemaftertestinghasbeencompleted.1.4

4、Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.NOT

5、E1—ThereisnoknownISOequivalenttothisstard.1.5ThisinternationalstardwasdevelopedinaccdancewithinternationallyrecognizedprinciplesonstardizationestablishedintheDecisiononPrinciplesftheDevelopmentofInternationalStardsGuides

6、RecommendationsissuedbytheWldTradeganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStards:2D883TerminologyRelatingtoPlasticsD1600TerminologyfAbbreviatedTermsRelatingtoPlasticsD6869TestMethodfC

7、oulometricVolumetricDeterminationofMoistureinPlasticsUsingtheKarlFischerReaction(theReactionofIodinewithWater)E691PracticefConductinganInterlabatyStudytoDeterminethePrecisionofaTestMethodE2935PracticefConductingEquivalen

8、ceTestinginLabatyApplications3.Terminology3.1Definitions—ThedefinitionsusedinthistestmethodareinaccdancewithTerminologiesD883D1600.3.2Symbols:3.2.1lift—theresultofconvectioncurrentscreatedduringtheheatingofthespecimenrai

9、singthesamplepanoffofitssupptfalselyindicatingamoistureloss.3.2.1.1Discussion—Theeffectsofliftarecompensatedfindifferentwaysbydifferentmanufacturers.4.SummaryofTestMethod4.1Thespecimenisspreadontoasamplepanthatissupptedo

10、nabalanceinaheatingchamberthathasbeenpreheatedequilibratedtothespecifiedidletemperature.Itisthenheatedtovapizethemoisture.Theanalysisiscompletedwhentheindicatedweightlossfallsbelowaratespecifiedinthetestconditions.Thetot

11、allossofweightisintegrateddisplayedasthepercentofmoisture.4.2Throughadjustmentoftheanalyzer’sparametersettingsasetofconditionsisdevelopedtomeasuremoisture.5.SignificanceUse5.1Thistestmethodisintendedfuseasacontrolaccepta

12、nceassessmenttest.5.2Moisturewillaffecttheprocessabilityofsomematerials.Fthesematerialsdefectswilloccuriftheyareprocessedwithamoisturecontentoutsideoftherecommendedrange.5.3Thephysicalpropertiesofsomeplasticsaregreatlyaf

13、fectedbythemoisturecontent.6.Interferences6.1Whentestingplasticmaterialsfmoisturebyalossinweighttechniquethepossibilityexistsfvolatilesotherthanmoisturetobeevolvedcauseabiasedhighresultifthematerialhasnotbeendriedtoremov

14、eexcessmoisturelowboilingvolatiles.Itisimptanttohaveawkingknowledgeofthematerialthatisbeingtestedtoremainbelowanymeltingdecompositiontemperaturesthatwouldunnecessarilycausetheemissionofvolatileswhichcanbeharmful.7.Appara

15、tus7.1MoistureAnalyzercontaining:1ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlasticsisthedirectresponsibilityofSubcommitteeD20.70onAnalyticalMethods.CurrenteditionapprovedJune152017.PublishedAugust2017.igin

16、allyapprovedin2004.Lastpreviouseditionapprovedin2012asD698012.DOI:10.1520D698017.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocu

17、mentSummarypageontheASTMwebsite.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStatesThisinternationalstardwasdevelopedinaccdancewi

18、thinternationallyrecognizedprinciplesonstardizationestablishedintheDecisiononPrinciplesftheDevelopmentofInternationalStardsGuidesRecommendationsissuedbytheWldTradeganizationTechnicalBarrierstoTrade(TBT)Committee.1Copyrig

19、htbyASTMIntl(allrightsreserved)MonAug1322:42:04EDT2018DownloadedprintedbyZhejiangUniversity(ZhejiangUniversity)pursuanttoLicenseAgreement.Nofurtherreproductionsauthized.DownloadFrom:bbs.DownloadFrom:bbs.12.1.1Completeide

20、ntificationofthesampletestedincludingtypeofmaterialsourcemanufacturer’scodefmprevioushisty12.1.2Dateoftest12.1.3Individualspecimensize12.1.4Individualspecimenmoisture12.1.5Averagemoistureifmultipletestsarerun.13.Precisio

21、nBias3413.1Therepeatabilityofthistestmethodisbasedonaninterlabatystudyconductedin2007.Eightlabatiesanalyzedeightdifferentplasticmaterialsfmoisturecontent.Every“testresult”representsanindividualdetermination.Thelabatiesre

22、ptedtwotofourreplicateresultsfeachanalysisindertoestimatetherepeatabilityreproducibilitylimitsofthestard.PracticeE691wasfollowedfthedesignanalysisofthedata.13.1.1RepeatabilityLimit(r)—Thevaluebelowwhichtheabsolutediffere

23、ncebetweentwoindividualtestresultsobtainedunderrepeatabilityconditionsmaybeexpectedtooccurwithaprobabilityofapproximately0.95(95%).13.1.1.1RepeatabilitylimitsarelistedinTable1.13.1.2ReproducibilityLimit(R)—Thevaluebeloww

24、hichtheabsolutedifferencebetweentwoindividualtestresultsobtainedunderreproducibilityconditionsmaybeexpectedtooccurwithaprobabilityofapproximately0.95(95%).13.1.2.1ReproducibilitylimitsarelistedinTable1.13.2Bias—Atthetime

25、ofthestudythetestspecimenschosenfanalysiswerenotacceptedreferencematerialssuitablefdeterminingthebiasfthistestmethodtherefenostatementonbiasisbeingmade.13.3Therepeatabilitystatementwasdeterminedthroughstatisticalexaminat

26、ionof162datapointsfromeightlabatiesoneightmaterials.Theseeightmaterialsweredescribedasthefollowing:MaterialA:Nylon66(notdried)MaterialB:PET(dried)MaterialC:TPE(dried)MaterialD:Polycarbonate(notdried)MaterialE:Nylon66(dri

27、ed)MaterialF:TPE(notdried)MaterialG:PC(dried)MaterialH:PET(notdried)13.4Tojudgetheequivalencyoftwotestresultsitisrecommendedtochoosethematerialclosestinacteristicstothetestmaterial.14.Keywds14.1moisturedeterminationplast

28、icsvolatilecontentANNEXES(MatyInfmation)A1.MOISTUREANALYZERWITHELECTRONICLIFTCOMPENSATIONA1.1SuggestedtestconditionsfedplasticsaregiveninTableA1.1.3SupptingdatahavebeenfiledatASTMInternationalHeadquartersmaybeobtainedbyr

29、equestingResearchReptRR:D201250.4EquivalencetestinginASTMstardsarecoveredbyPracticeE2935.TABLE1Moisture(%)MaterialAverageAStardDeviationofLabAveragesRepeatabilityStardDeviationReproducibilityStardDeviationRepeatabilityLi

30、mitReproducibilityLimitxSsrsRrRA(Nylon66)0.49540.01310.00860.01510.02420.0423B(PET)0.02920.00840.00470.00940.01330.0263C(TPE)0.01070.00700.00260.00730.00720.0204D(PC)0.07480.00400.00610.00670.01710.0187E(Nylon66)0.13900.

31、03020.02410.03670.06740.1027F(TPE)0.04060.03290.00240.03300.00680.0924G(PC)0.01810.00850.00300.00880.00830.0247H(PET)0.10530.01090.00490.01170.01380.0327ATheaverageofthelabaties’calculatedaverages.D6980?173CopyrightbyAST

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