Designation:D7025−09(Reapproved2021)´1StandardTestMethodforAssessingCleanFlaxFiberFineness1ThisstandardisissuedunderthefixeddesignationD7025;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—ResearchreportinformationwasaddedtoSection18editoriallyinAugust2021.1.Scope1.1Thistestmethodprovidestwooptionsthatcoverthedeterminationofthefinenessofcleanlooseflaxfibersby:Option1,measuringthespecificsurfaceareabytheresistanceofaplugofflaxfiberstoairflowunderprescribedconditions,orOption2,estimatingthemassperunitlength.NOTE1—ForothermethodsfordeterminingthefinenessoffibersrefertoAppendixX1.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1441PracticeforSamplingCottonFibersforTestingD1577TestMethodsforLinearDensityofTextileFibersD1776/D1776MPracticeforConditioningandTestingTex-tilesD6798TerminologyRelatingtoFlaxandLinen3.Terminology3.1ForterminologyrelatingtoFlax,seeTerminologyD6798.3.1.1Thefollowingtermsarerelevanttothisstandard:finenessindexandspecificsurfaceindex.3.2Fordefinitionsofallothertextileterms,seeTerminol-ogyD123.4.SummaryofTestMethod4.1UsingOption1,apredeterminedmassofcleanlooseflaxfibersgen...
