Designation:D1577−07(Reapproved2012)StandardTestMethodsforLinearDensityofTextileFibers1ThisstandardisissuedunderthefixeddesignationD1577;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthemeasurementofmassperunitlength(lineardensity)oftextilefibersandfilaments.Directweighingandvibroscopeprocedureswithmodificationsforcrimpedanduncrimpedfibersareincluded.Theoptionsandsectionsarelistedbelow.OptionSectionsA—FiberBundleWeighing7–15B—Single-FiberWeighing16–23C—Vibroscope,General24–3035and36C1—UncrimpedFibers31and32C2—CrimpedFibers33and34PrecisionandBias37and38NOTE1—Forlineardensityofshortlengthsofyarn,refertoTestMethodD1059.Forcottonlineardensity,refertoTestMethodsD1769andD2480.Formeasurementofwooldiameter,refertoTestMethodsD1282,D2130andD3510.1.2Thecrimp,taperandcross-sectionalshapeofthefibermayinfluencethelineardensitymeasuredbysingle-fiberweighingandvibroscope.1.3Thesetestmethodsmeasurethelineardensityoffiberswithmoistureinequilibriumwiththestandardatmospherefortestingtextiles.Thefibermoistureundertheseconditionsisnotnecessarilythesameasthecommercialmoistureregainforthefibers.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD6...
