Designation:D3025−07(Reapproved2012)StandardPracticeforStandardizingCottonFiberTestResultsbyUseofCalibrationCottonStandards1ThisstandardisissuedunderthefixeddesignationD3025;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheuseofreferencestandardcottonsforthestandardizationofinstrumentsandtechniquesusedtotestcottonfibersinvariouslaboratories.1.2Standardizationmaybeachievedbyapplicationofacorrectionfactorbasedonthereferencestandards,orbymodificationofthetechniqueinuse.NOTE1—Whenreferencestandardsareusedtodevelopcorrectionfactors,ortoadjustanoperator’stechnique,noinstrumentcalibrationprocessesareinvolved.Theterm“Calibration”isproperlyusedfortheapplicationorassignmentofpermanentscalesormarkstoaninstrument.Adjustmentscanbemadetospecificinstrumentsandaccessoriessuchasorifices,metallicstrips,orcellophanesheets,inordertoobtaintheprescribedvalueswithaspecificinstrument.Sinceanoperator’stechniqueortheinterpretationofamethodorprocedureisinherentlyvariable,itcannotbecalibrated,thatis,assignedapermanent,definitevalue.Theuseofreferencestandards,however,affordsameansforstandardizingtechniquesandcheckingthereliabilityofobservedresults.1.3Thispracticerecognizestwotypesofreferencestan-dards:(1)calibrationcottonstandards(see6.1)and(2)workingcottonstandards(see6.2).1.4Theinstructionsincludedinthispracticecanbeusedwithcottonfibersinanyformsuitablefortestingwiththeparticularinstrumenttobeused.1.5Theinstructionsinthepracticeareapplicabletocottonfibersbutcanalsobeappliedtospecificblendsofcottonandotherfibers,ortootherfibersthatcanbetestedwiththeinstrumentsdesignedfortestingcottonfibers.Noinformationisavailable,however,toshowthattestproceduresstandardizedwithreferencecottonsamplesareequallyreliablewithvariouscottonfiberblendsorwithotherfibers.NOTE...
