ASTM_D_2102_-_02_2018.pdf

Designation:D210202(Reapproved 2018)Standard Test Method forShrinkage of Textile Fibers(Bundle Test)1This standard is issued under the fixed designation D2102;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.1.Scope1.1 This test method covers the measurement of the unre-strained shrinkage of a bundle of crimped or uncrimped fibersfrom exposure to some environment,for instance,boilingwater for 15 min.1.1.1 This test method may be used on fibers from tow andfibers removed from spun or continuous filament yarn.NOTE1For measurement of shrinkage of single fibers,refer to TestMethod D5104.1.2 The values stated in either inch-pound or SI units are tobe regarded separately as the standard.The values stated ineach system are not exact equivalents,therefore,each systemmust be used independently of the other.1.3 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.1.4 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 TextilesD1776/D1776M Practice for Conditioning and Testing Tex-tilesD2258/D2258M Practice for Sampling Yarn for TestingD3333 Practice for Sampling Manufactured Staple Fibers,Sliver,or Tow for TestingD4849 Terminology Related to Yarns and FibersD5104 Test Method for Shrinkage of Textile Fibers(Single-Fiber Test)3.Terminology3.1 For terminology related to Yarns and Fibers see Termi-nology D4849.3.2 The following terms are relevant to this standard:shrinkage.3.3 For definition of other terms related to textiles,seeTerminology D123.4.Summary of Test Method4.1 Auniform bundle of conditioned parallel fibers is lightlyloaded between clamps and the nip to nip length measured.Without being removed from the clamps,the bundle specimenis then exposed to the test environment,typically,boiling waterfor 15 min.After reconditioning,the bundle length is remea-sured under the same light loading.NOTE2Due to the very high variability of the shrinkage of individualfibers of high shrinkage types,to obtain a reliable average value wouldrequire an excessive number of determinations,each rather tedious.Thebundle method does not give the true average value,but rather a weightedvalue approaching the highest shrinkage fiber in the bundle.Since theweighted value more closely approximates the properties found in a highbulk yarn made from such fibers,the weighted value would seem to bemore appropriate.5.Significance and Use5.1 Limited accuracy in measuring the change in lengthproduces errors in estimating values for shrinkage below 10%.However,this test is being used for low level shrinkage fibersbecause the results give have been found to give an adequateindication of average shrinkage at the lower levels.The test isnot adequate for determining variability in average shrinkage atlow levels.If there are differences of practical significancebetween reported test results for two laboratories(or more),comparative tests should be performed to determine if there isa statistical bias between them,using competent statisticalassistance.As a minimum,use the samples for such a com-parative tests that are as homogeneous as possible,drawn fromthe same lot of material as the samples that resulted in disparateresults during initial testing and randomly assigned in equal1This test method is under the jurisdiction of the ASTM Committee D13 onTextiles and is the direct responsibility of Subcommittee D13.58 on Yarns andFibers.Current edition approved July 1,2018.Published July 2018.Originally approvedin 1962.Last previous edition approved in 2012 as D2102 02(2012)1.DOI:10.1520/D2102-02R18.2For 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.1 numbers to each