ASTM_D_2258_-_D_2258M_-_16_2022.pdf

Designation:D2258/D2258M16(Reapproved 2022)Standard Practice forSampling Yarn for Testing1This standard is issued under the fixed designation D2258/D2258M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice describes a procedure for the division ofshipments of yarn into test lots and the sampling of such lotsfor testing.1.1.1 This practice can be used for lot sample testing ofyarns for both pre-fabric production and post-fabric produc-tion.1.2 This practice is applicable to single,plied,or cabledyarns,and cords,made of any fiber or mixture of fibers,andsupported on any form of package,including beams.1.3 This practice also describes procedures for the samplingof yarn(s)removed from woven or knitted fabrics;however,when thus sampled,the yarns are usually not representative ofentire shipments,as referred to in 1.1.Consequently,theresultant sampling can only be used to determine the charac-teristics of the yarn and is usually not used for acceptancetesting.Moreover,it should be recognized that the character-istics of yarns from fabrics may be different than the charac-teristics of the same yarn(s),prior to being entered into thefabric manufacturing process.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1578 Test Method for Breaking Strength of Yarn in SkeinFormD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For terminology related to Yarns and Fibers,see Termi-nology D4849.3.2 The following terms are relevant to this standard:beam,beam set,bulk sample,case,cone,end,fabric package,laboratory sample,lot,lot sample,primary sampling unit,production lot,sample,sampling unit,sample skein,specimen,and yarn package.3.3 For definitions of all other textile terms see TerminologyD123.4.Summary of Practice4.1 Instructions are given for dividing the yarn into lots,fordetermining the number of cases,beams,or fabric packages tobe selected from each lot as a lot sample,and for determiningthe number of packages,including the number of ends,representing those packages taken from the lot sample as alaboratory sample.5.Significance and Use5.1 Assigning a value to any property of the material in acontainer or in a lot,consignment,or delivery involves ameasurement process that includes both sampling and testingprocedures.The correctness of the value assigned dependsupon the variability due to testing and sampling plan.Even1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved Feb.1,2022.Published March 2022.Originallyapproved in 1964.Last previous edition approved in 2016 as D2258 99(2016).DOI:10.1520/D2258_D2258M-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1when the variability due to testing is minimized by carefullydeveloped procedures,correct and consistent estimates of thetrue value of the property are possible only when the samplingprocedure avoids systematic bias,minimizes variations due tosampling,and provides a la