ASTM-D1790.22374

Designation:D1790−14StandardTestMethodforBrittlenessTemperatureofPlasticSheetingbyImpact1ThisstandardisissuedunderthefixeddesignationD1790;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthattemperatureatwhichplasticsheeting1.00mm(0.040in.)orlessinthicknessexhibitsabrittlefailureunderspecifiedimpactconditions.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.NOTE1—ThistestmethodwasdevelopedjointlywiththeSocietyofthePlasticsIndustry,primarilyforusewithplasticizedvinylsheetings.Itsapplicabilitytootherplasticsheetingsmustbeverifiedbytheuser.1.3Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.NOTE2—ThistestmethodandISO8570addressthesamesubjectmatter,butdifferintechnicalcontent.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD5947TestMethodsforPhysicalDimensionsofSolidPlasticsSpecimensD6988GuideforDeterminationofThicknessofPlasticFilmTestSpecimensE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ISOStandard:ISO8570Plastics—FilmandSheeting—DeterminationofCold-CrackTemperature33.Terminology3.1Definitions:3.1.1brittlenesstemperature,Tb—thattemperature,derivedstatistically,where80%ofthespecimenswouldprobablypass95%ofthetimewhenastatedminimumnumberaretestedbythistestmethod.The80%-passingvalueisdeterminedbyplottingthedataonprobabilitygraphpaper,asdescribedin9.1.3.1.2General—DefinitionsoftermsapplyingtothistestmethodappearinTerminologyD883.4.SignificanceandUse4.1Dataobtainedbythistestmethodhavebeenusedtopredictthebehaviorofplasticsheetingatlowtemperaturesonlyiftheconditionsofdeformationaresimilartothosespecifiedinthistestmethod.Thistestmethodisusefulforspecificationtestingandforcomparativepurposes,butdoesnotnecessarilydeterminethelowestusetemperatureforaparticularplastic.4.2Ithasbeendemonstratedthatoncalenderedsheetingthebrittlenesstemperatureissensitivetothedirectionoffold.Ithasalsobeendemonstratedthatthebrittlenesstemperatureissensitivetothedirectionofsampling.Therefore,itisimpera-tivethattheprocedurefortakingspecimensandfoldingbefollowedexplicitly.5.Apparatus5.1ColdConditioningChamber,atleast450by450by450mm(18by18by18in.).Means(automaticormanual)shallbeprovidedforcontrollingthetemperatureofthechambertowithin62°Cofthedesiredvalue.1ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlasticsandisthedirectresponsibilityofSubcommitteeD20.30onThermalProperties.CurrenteditionapprovedOct.1,2014.PublishedOctober2014.Originallyapprovedin1960.Lastpreviouseditionapprovedin2008asD1790-08.DOI:10.1520/D1790-14.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3AvailablefromAmericanNationalStandardsInstitute(ANSI),25W.43rdSt.,4thFloor,NewYork,NY10036,*ASummaryofChangessectionappearsattheendofthisstandardCopyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates1CopyrightbyASTMInt'l(allrightsreserved);TueSep2204:12:01EDT2015Downloaded/printedbyProcter(Procter)pursuanttoLicenseAgreement.Nofurtherreproductionsauthorized.5.2ImpactTestershowninFig.1shallbeconstructedofcold-rolledsteelexceptforthebolts,screws,andrubberstopper.Itisrecommendedthatallstructuralparts(thatis,base,anvil,arm,armsupports,andshaft)bechromiumplatedtopreventcorrosion.Thearm,includingtherubberstopperandbolt,shallweigh3.09kg628g(6lb1361oz).5.3Die,50.860.4mmby146.160.4mm(261⁄64in.by53⁄461⁄64in.)tocutthetestspecimensfromthesample.5.4Stapler,desk-type,withastopmountedonthebaseexactly12.7mm(1⁄2in.)backofthecenterofthegrooverthatturnsthestaple.5.5IndexCardStock,50by127mm(2by5in.).5.6ThicknessGauge—Adead-weightdialordigitalmi-crometerasdescribedinD5947orD6988asappropriateforthematerialorspecimengeometrybeingtested.6.TestSpecimens6.1Thetestspecimensshallbecutwiththedie.Thelengthofthetestspecimenshallbeparalleltothetransversedirectionofthesheeting.6.2Thetestspecimensshallbeselectedsothatthethicknessisuniformtowithin10%ofthethicknessoverthelengthofthespecimeninthecaseofspecimens0.25mm(0.010in.)orlessinthicknessandtowithin5%inthecaseofspecimensgreaterthan0.25mm(0.010in.)inthicknessbutdonotexceed1.00mm(0.040in.)inthickness.6.3The50-mm(2-in.)endsofeachspecimenshallbesocollectedthatagradual,closedloopisformedatroomtemperatures.Thecollectedendsofthespecimenandoneendofthe50by127-mm(2by5-in.)cardshallbematched