ASTM_D_5103_-_07_2012.pdf

Designation:D510307(Reapproved 2012)Standard Test Method forLength and Length Distribution of Manufactured StapleFibers(Single-Fiber Test)1This standard is issued under the fixed designation D5103;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 determination of averagestaple length and staple length distribution of both manufac-tured and natural fibers by manually measuring single fiberlengths.This test method is also used to measure the length offibers removed from a staple yarn,but such a measurementmay not represent the fibers staple length,as manufactured.1.2 Because this test method requires measuring the lengthof only 50 fibers,it is not suitable for use in determining thenumber of long fibers that occur infrequently in a sample.NOTE1For determination for overlength fibers,refer to Test MethodD3513.NOTE2For methods covering the determination of the average lengthand length distribution of natural fibers,refer to the following methods:for cotton,Test Method D1440,and Test Method D1447,for wool,TestMethod D519,Test Method D1234,and Test Method D1575.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD519 Test Method for Length of Fiber in Wool TopD1234 Test Method of Sampling and Testing Staple Lengthof Grease WoolD1440 Test Method for Length and Length Distribution ofCotton Fibers(Array Method)D1447 Test Method for Length and Length Uniformity ofCotton Fibers by Photoelectric MeasurementD1575 Test Method for Fiber Length of Wool in ScouredWool and in Card SliverD1776 Practice for Conditioning and Testing TextilesD2258 Practice for Sampling Yarn for TestingD3333 Practice for Sampling Manufactured Staple Fibers,Sliver,or Tow for TestingD3513 Test Method for Overlength Fiber Content of Manu-factured Staple FiberD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For all terminology relating to D13.58,Yarns andFibers,refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:length distribution,velveteen.3.2 For all other terminology related to textiles,see Termi-nology D123.4.Summary of Test Method4.1 Each fiber to be tested is gripped at the tips with forceps,fully extended without stretching,and measured.The averagefiber length of the measured fibers is calculated and the lengthdistribution curve is plotted.5.Significance and Use5.1 This test method is used for research,development,quality control,product specifications,and may be used foracceptance testing of commercial shipments of textile fibers.However,caution is advised since information on between-laboratory precision is lacking.Comparative tests as directed in5.1.1 may be advisable.5.1.1 If there are differences of practical significance be-tween 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,test samples that are as homogenousas possible,drawn from the material from which the disparatetest results were obtained,and randomly assigned in equalnumbers to each laboratory for testing.The test results from thetwo laboratories should be compared using a statistical test forupaired data,at a probability level chosen prior to the testingseries.If a bias is found,either its cause must be found and1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and FibersCurrent edition approved July 1,2012.Published August 2012.Originallyapproved in 1990.Last previous edition approved in 2007 as D5103 07.DOI:10.1520/D5103-07R12.2For 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 States1 corrected,or future test results for that material must beadjusted in consideration of the known bias.5.2 This test method provides objective measurements fordetermining the average fiber length and length distribution ina sample of fiber.5.3 The staple length diagram of a fiber sample can be usedto determine the relative number of fibers above and below aspecified length.If a fiber is too long,it will not process wellin spinning,and if there is a preponder