Designation:D4371/D4371M−06(Reapproved2019)´1StandardTestMethodforDeterminingtheWashabilityCharacteristicsofCoal1ThisstandardisissuedunderthefixeddesignationD4371/D4371M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—ThedesignationwaseditoriallyupdatedtodualandothereditorialchangesweremadethroughoutinDecember2019.INTRODUCTIONTheAmericanSocietyforTestingandMaterialshasrecognizedtheneedforastandardproceduretoconductwashabilityanalysesthatwillserveasanaidtotechnicalcommunicationamongindividualsandorganizationsthatsupply,purchase,andutilizecoal.Thistestmethodstandardizesproceduresutilizedforperformingwashabilityanalyses,thedatafromwhichcanbeusedforinterpretingpreparationplantefficiency,fordeterminingpreparationplantdesign,andfordeterminingthepotentialrecoveryandqualityofcoalreserves.1.Scope1.1Thistestmethoddescribesproceduresfordeterminingthewashabilitycharacteristicsofcoarse-coalfractionsandfine-coalfractions.Eachsamplebeingtestedcanhavemorethanonecoarse-coalsizefractionandmorethanonefine-coalsizefraction(seeAnnexA1).Eachsuchsizefractionhasanuppersizelimitandalowersizelimit,neitherofwhichoverlapswiththenextlargernorsmallersizefraction.(SeeTestMethodD4749.)1.2While,ingeneral,thistestmethodhasusefulapplicationindeterminingthewashabilitycharacteristicsoflow-rankcoals,inthestrictestsense,itisnotnecessarilythemosttechnicallycorrecttestmethodtodeterminewashabilitychar-acteristicsoflow-rankcoalsbecauseofproblemsrelativetothelossofmoisturethroughdryingduringsamplepreparationandanalysis.Methodsthataredirectlyapplicabletolow-rankcoalsaretobedeveloped.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeuse...
