ASTM_D_2258_-_99_2012.pdf

Designation:D225899(Reapproved 2012)Standard Practice forSampling Yarn for Testing1This standard is issued under the fixed designation D2258;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the 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.1.2 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 the standard.Within the text,the inch-pound units are shown in parentheses.The valuesstated in each system are not exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith this practice.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 and health practices and determine the applica-bility of regulatory limitations prior to use.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of Yarn(Yarn Num-ber)by the Skein MethodD4271 Practice for Writing Statements on Sampling in TestMethods for Textiles(Withdrawn 2009)3D4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For terminology related to Yarns and Fibers,see Termi-nology D4849.3.2 The following terms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.See Practice D4271.5.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.Even when the variabilitydue to testing is minimized by carefully developed procedures,correct and consistent estimates of the true value of theproperty are possible only when the sampling procedure avoidssystematic bias,minimizes variations due to sampling,andprovides a laboratory sample of adequate size.1This 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 March 1,2012.Published April 2012.Originallyapproved in 1964.Last previous edition approved in 2005 as D2258 99(2005).DOI:10.1520/D2258-99R12.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Practice D2258 may not give the most efficient samplingplan that might be devised in special situations but does presenta general procedure that gives satisfactory precision with aneconomical amount of sampling and one which does notrequire elaborate statistical computation based on previousknowledge of the amount of variation between primary sam-pling units(such as cases,beams or fabric packages),betweenunits of the laboratory sample taken from the primary samplingunits of the lot sample(such as yarn packages taken from