2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:D1725?12StardPracticefPreparingResinSolutionsfViscosityMeasurementbyBubbleTimeMethod1ThisstardisissuedunderthefixeddesignationD1725thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptionin

2、thecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thispracticeprovidesinstructionsfpreparingresins

3、olutionsviscositymeasurementbybubbletimemethod.1.2ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.3Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithi

4、tsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.FspecifichazardstatementsseeSection7.2.ReferencedDocuments2.1ASTMStards:2D1

5、54GuidefTestingVarnishesD1545TestMethodfViscosityofTransparentLiquidsbyBubbleTimeMethodD6440TerminologyRelatingtoHydrocarbonResinsE691PracticefConductinganInterlabatyStudytoDeterminethePrecisionofaTestMethod2.2OtherDocum

6、ent:OSHARegulations29CFRparagraphs19.10.10001910.120033.Terminology3.1FdefinitionsrelatedtohydrocarbonresinsseeTerminologyD6440.4.SummaryofPractice4.1Solidresinsaredissolvedinganicsolventsbycoldcuthotcutmethodsinthelabat

7、y.Theviscosityofsuchpreparedsolutionsofcommercialsolutionsofresinsisthendeterminedbythebubbletimemethod(TestMethodD1545).Thebubblesecondsareapproximatelyequaltostokes.5.Apparatus5.1Bathconstanttemperatureconsistingofacyl

8、indricalglassjarofabout5galcapacityanaquariumtankwithcontrolscapableofmaintainingthetemperatureat2560.1Cwithwaterasthebathmedium.5.2Bottles225mL(8oz)widemouthscrewcap.5.3Cellophanesheetcutinto102127mm(45in.)squares.5.4Ck

9、sNo.2shttapertofitviscositytubes.5.5HolderfViscosityTubespreferablyamechanicalholder4withrackpinionfinvertingthetubes.TheholdershouldbecheckedwithasmalllevelTsquaretomakecertainitholdsthetubesinanexactverticalpositionaft

10、erbeingplacedintheconstanttemperaturebath.5.6BottleShakerpreferablyonewhichwillgiveendoverendagitation.5.7TimingDevicesuchasastopwatchelectricstopclockcapableofbeingreadtoaprecisionof0.1s.5.8ViscosityTubesofclearglassfla

11、tbottomshaving10.6560.025mminsidediameter11461mmoutsidelength.Plainlylegiblelinesshallbelocatedonthetubesasfollows:270.5mm1000.5mm1080.5mmAlldistancesshallbemeasuredfromthebottomoutsideofthetube.Thedistancebetweenthefirs

12、tsecondlinesshallbe7360.5mm.1ThispracticeisunderthejurisdictionofASTMCommitteeD01onPaintRelatedCoatingsMaterialsApplicationsisthedirectresponsibilityofSubcommitteeD01.33onPolymersResins.CurrenteditionapprovedJuly152012.P

13、ublishedSeptember2012.iginallyapprovedin1960.Lastpreviouseditionapprovedin2004asD1725–04.DOI:10.1520D1725–12.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumein

14、fmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments732N.CapitolSt.NWMailStop:SDEWashingtonDC20401:www.access.gpo.gov.4Suitablemechanicalviscosit

15、ytubeholdersareavailablefromvariouslabatysupplycompanies.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1APPENDIX(NonmatyInfmation)X1.INTERLABATYSTUDYX1.1Aninterlabatystudyusi

16、ngthisstardpracticeinconjunctionwithTestMethodD1545wasconductedwhenthepracticewasiginallyapprovedin1960.X1.2RepeatabilityReproducibility—Tworesultseachthemeanofthreereadingsshouldbeconsideredsuspectiftheydifferbymethan7%

17、relative(95%confidencelevel).SeePracticeE691.NOTEX1.1—Thisestimateofprecisionisbasedonaninterlabatystudy.5Becausethedatashowednosignificantdifferencefbetweenlabatywithinlabatyvariancestheprecisionestimatesfrepeatabilityr

18、eproducibilitywerepooledasinglevaluerepted.ASTMInternationaltakesnopositionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationoft

19、hevalidityofanysuchpatentrightstheriskofinfringementofsuchrightsareentirelytheirownresponsibility.Thisstardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapp

20、rovedwithdrawn.YourcommentsareinvitedeitherfrevisionofthisstardfadditionalstardsshouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhic

21、hyoumayattend.IfyoufeelthatyourcommentshavenotreceivedafairhearingyoushouldmakeyourviewsknowntotheASTMCommitteeonStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshoho

22、ckenPA194282959UnitedStates.Individualreprints(singlemultiplecopies)ofthisstardmaybeobtainedbycontactingASTMattheaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).Permissionrightstoph

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