astm-d618-05-standard-practice-for-conditioning-pl

Designation:D618–05StandardPracticeforConditioningPlasticsforTesting1ThisstandardisissuedunderthefixeddesignationD618;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Ingeneral,thephysicalandelectricalpropertiesofplasticsareinfluencedbytemperatureandrelativehumidityinamannerthatmateriallyaffectstestresults.Inorderthatreliablecomparisonsmaybemadeofdifferentmaterialsandbetweendifferentlaboratories,itisnecessarytostandardizethehumidityconditions,aswellasthetemperature,towhichspecimensofthesematerialsaresubjectedpriortoandduringtesting.Thispracticedefinesproceduresforconditioningplastics(althoughnotnecessarilytoequilibrium)priortotesting,andtheconditionsunderwhichtheyshallbetested.1.2Forsomematerials,theremaybeamaterialspecifica-tionthatrequirestheuseofthispractice,butwithsomeproceduralmodifications.Thematerialspecificationtakesprecedenceoverthispractice.Refertothematerialspecifica-tionbeforeusingthispractice.Table1inClassificationD4000liststheASTMmaterialspecificationsthatcurrentlyexist.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ISO291isrelatedtothispractice;however,ISO291de-scribesonlytwotemperatureandhumidityconditionsforconditioningortesting,orboth.2.ReferencedDocuments2.1ASTMStandards:2D709SpecificationforLaminatedThermosettingMaterialsD756PracticeforDeterminationofWeightandShapeChangesofPlasticsUnderAcceleratedServiceConditionsD4000ClassificationSystemforSpecifyingPlasticMate-rialsD5032PracticeforMaintainingConstantRelativeHumid-itybyMeansofAqueousGlycerinSolutionsE104PracticeforMaintainingConstantRelativeHumiditybyMeansofAqueousSolutions2.2ISOStandard:ISO291Plastics—StandardAtmospheresforConditioningandTesting33.Terminology3.1Definitions:3.1.1roomtemperature—atemperatureintherangefrom20to30°C[68to85°F].3.1.2standardlaboratoryatmosphere—anatmospherehav-ingatemperatureof23°C[73.4°F]andarelativehumidityof50%withstandardtolerancesasspecifiedin3.2shallbethestandardlaboratoryatmosphere.3.1.3standardlaboratorytemperature—atemperatureof23°C[73.4°F]withstandardtoleranceasspecifiedin3.2shallbethestandardlaboratorytemperature.3.2Tolerances:3.3relativehumidity—standardtoleranceshallbe65%.3.3.1Discussion—Wheretheclosertolerance62%isre-quired,itmaybespecifiedandthetoleranceusedreported.3.4standardtesttemperaturesotherthanstandardlabora-torytemperature—whendataaretobeobtainedforcompari-sonpurposesataspecifictemperatureeitheraboveorbelowthestandardlaboratorytemperature,thetemperatureshouldbeselectedfromthefollowing:TestTemperatures,°C[°F]Tolerance,plusorminus,°C[°F]−70[−94]2.0[3.6]−55[−67]2.0[3.6]−40[−40]2.0[3.6]−25[−13]2.0[3.6]0[32]2.0[3.6]35[95]1.0[1.8]50[122]2.0[3.6]70[158]2.0[3.6]90[194]2.0[3.6]105[221]2.0[3.6]120[248]2.0[3.6]130[266]2.0[3.6]155[311]2.0[3.6]180[356]2.0[3.6]200[392]3.0[5.4]225[437]3.0[5.4]1ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsandisthedirectresponsibilityofSubcommitteeD20.50onPermanenceProperties.CurrenteditionapprovedNovember1,2005.PublishedNovember2005.Originallyapprovedin1941.Lastpreviouseditionapprovedin2000asD618-00.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3AvailablefromAmericanNationalStandardsInstitute(ANSI),25W.43rdSt.,4thFloor,NewYork,NY10036.1*ASummaryofChangessectionappearsattheendofthisstandard.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.TestTemperatures,°C[°F]Tolerance,plusorminus,°C[°F]250[482]3.0[5.4]275[527]3.0[5.4]300[572]3.0[5.4]325[617]4.0[7.2]350[662]5.0[9.0]400[752]6.0[10.8]450[842]8.0[14.4]500[932]10.0[18.0]600[1112]12.0[21.6]3.5temperature—standardtoleranceshallbe62°C[63.6°F].3.5.1Discussion—Wheretheclosertolerance61°C[61.8°F]isrequired,itmaybespecifiedandthetoleranceusedreported.3.6temperatureandrelativehumiditymeasurement—measurementsshallbemadeascloseaspossibletothecenteroftheroomorchamber.3.6.1Discussion—Thetemperatureandrelativehumidityindicatedatthecontrolpoint,oronarecorder,maynotberepresentativeofaconditionelsewhereinanenclosureorroombecauseoflocaleffectsordeficiencyincirculationofair.Additionalmeasurementsshallbemadethroughouttheareatoshowcompliancetothetemperatureandrelativehumidityrequired.4.SignificanceandUse4.1Conditioningofspecimensmaybeundertaken:(1)forthepurposeofbringingthematerialintoequilibriumwithnormaloraverageroomconditions,(2)simplytoobtainreproducibleresults,regardlessofprevioushistoryofexpo-sure,or(3)tosubjectthematerialtoabnormalconditionsoftemp