ASTM D 3776 Standard Test Method for Mass Per Unit

Designation:D3776/D3776M–09aStandardTestMethodsforMassPerUnitArea(Weight)ofFabric1ThisstandardisissuedunderthefixeddesignationD3776/D3776M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthemeasurementoffabricmassperunitarea(weight)andisapplicabletomostfabrics.1.2Therearefourapprovedoptions:1.2.1OptionA—FullPiece,Roll,BoltorCut(Section7).1.2.2OptionB—FullWidthSample(Section8).1.2.3OptionC—SmallSwatchofFabric(Section9).1.2.4OptionD—NarrowFabrics(Section10).1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1776PracticeforConditioningandTestingTextilesD3773TestMethodsforLengthofWovenFabricD3774TestMethodforWidthofTextileFabric2.2OtherStandard:ANSI/ASQCZ1.4InspectionbyAttributes33.Terminology3.1Definitions:3.1.1weight,n—asusedwithfabrics,massperunitarea.3.1.1.1Discussion—Fabricmassperunitareaisexpressedeitherasgramspersquaremetre(ouncespersquareyard),orgramsperlinearmetre(ouncesperlinearyard).Fabricmassisalsosometimesexpressedinverselyaslinearmetresperkilograms(yardsperpound)withthefabricwidthstated.3.2Fordefinitionsofothertextiletermsusedinthesetestmethods,refertoTerminologyD123.4.SummaryofTestMethods4.1FabricmassiscalculatedfromthemassofaspecimenthelengthandwidthofwhichhavebeenmeasuredasdirectedinoneoftheproceduresinTestMethodD3773andD3774.5.Apparatus5.1Scale,withacapacityandsensitivitysufficienttoweighthefullpiece,roll,bolt,orcutunitstowithin60.1%oftheirgrossmass.Theaccuracyofthescaleshouldbecertifiedbyarecognizedauthority.5.2Balance,havingacapacityandsensitivitytoweighwithin60.1%ofthemassofthespecimensbeingtested.5.3CuttingDie,eithersquareorroundwithanareaofatleast13cm2or4in.26.Conditioning6.1ConditiontestspecimensasdirectedinPracticeD1776.6.2Allweighingtestsshouldbemadeinthestandardatmospherefortestingtextiles(2061°C(7062°F),6562%RH),afterthespecimenshavebeenconditionedinthesameatmosphere.ItmaybeimpracticaltoconditionthespecimensinOptionAornonconditionedtestingmaybeagreeduponbythepurchaserandsupplier.Whenthefullrollsorboltsoffabriccannotbeproperlyconditionedinareason-abletimewithavailablefacilities,performthetestswithoutconditioningandreporttheactualconditionsprevailingatthetimeofthetest.Suchresultsmaynotcorrespondwiththeresultsobtainedaftertestingadequatelyconditionedspecimensinthestandardatmospherefortestingtextiles.1ThesetestmethodsareunderthejurisdictionofASTMCommitteeD13onTextilesandarethedirectresponsibilityofSubcommitteeD13.60onFabricTestMethods,Specific.CurrenteditionapprovedJuly1,2009.PublishedAugust2009.ReplacesSections35to41ofMethodsD1910–64(1975).Originallyapprovedin1979.Lastpreviouseditionapprovedin2009asD3776–09.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3AvailablefromAmericanNationalStandardsInstitute(ANSI),25W.43rdSt.,4thFloor,NewYork,NY10036,©ASTMInternational,100BarrHarbourDr.P.O.boxC-700WestConshohocken,Pennsylvania19428-2959,UnitedStatesCopyrightbyASTMInt'l(allrightsreserved);TueJan1923:47:46EST2010Downloaded/printedbyWallaceFu(Filligent+Hk+Limited)pursuanttoLicenseAgreement.Nofurtherreproductionsauthorized.7.OptionA—FullPiece,Roll,Bolt,orCut7.1SignificanceandUse7.1.1OptionAforthedeterminationofmassperunitareaofwovenfabricsmaybeusedforacceptancetestingofcommer-cialshipmentssinceithasbeenusedextensivelyinthetrade.7.1.2IncaseofadisputearisingfromdifferencesinreportedtestvalueswhenusingTestMethodsD3776foracceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimenswhichareashomogeneousaspossibleandwhicharefromalotofmaterialofthetypeinquestion.Thetestspecimensshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.Theaverageresultsfromthetwolaboratoriesshouldbecomparedusingstudent’st-testforunpaireddataandanacceptableprobabilitylevelchosenbythetwopartiesbeforetestingisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorthepurchaserandthesuppliermustagreetointerpretfuturetestresultsinthelightoftheknownbias.7.2Sam