ASTM_D_1234_-_13.pdf

Designation:D123413Standard Test Method ofSampling and Testing Staple Length of Grease Wool1This standard is issued under the fixed designation D1234;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 method2covers procedures for sampling andmeasuring the unstretched staple length,and variability inlength,of grease or pulled wool staples.The test method is alsoapplicable to mohair and other animal fibers in staple form.Theprocedure is not recommended for individual fibers or groupsof straightened fibers.NOTE1The determination of fiber length in wool top is covered inTest Method D519,the determination of fiber length of wool is covered inTest Method D1575.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D123 Terminology Relating to TextilesD519 Test Method for Length of Fiber in Wool TopD1575 Test Method for Fiber Length of Wool in ScouredWool and in Card SliverD4271 Practice for Writing Statements on Sampling in TestMethods for Textiles(Withdrawn 2009)4D4845 Terminology Relating to Wool3.Terminology3.1 For all terminology relating to D13.13,Wool and WoolFelt,refer to Terminology D4845.3.1.1 The following terms are relevant to this standard:grease wool,staple,staple length.3.2 For definitions of other textile terms used in the testmethod,refer to D123.4.Summary of Test Method4.1 By hand or by means of a sampling tool,staples(subsampling units)are withdrawn from randomly selectedsampling units(bags,bales,or packages)from a lot of wool orother animal fibers.The unstretched lengths of the staples aremeasured and the average staple length,standard deviation,and coefficient of variation calculated.5.Significance and Use5.1 The testing procedure in this test method for thedetermination of staple length is considered satisfactory foracceptance testing of commercial shipments of grease woolsince the test method has been used in the trade for acceptancetesting.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipments,the purchaser and the sup-plier should conduct comparative tests to determine if there isa statistical bias between their laboratories.Competent statis-tical assistance is recommended for the investigation of bias.As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that arefrom a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.The average results from the twolaboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before the testing is begun.If a bias is found,eitherits cause must be found and corrected,or the purchaser and thesupplier must agree to interpret future test results in the light ofthe known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1,2013.Published August 2013.Originallyapproved in 1950.Last previous edition approved in 2008 as D1234 85(2008).DOI:10.1520/D1234-13.2Further information covering the procedures and techniques described in thistest method appears in D.D.Johnston,H.Dean Ray,W.J.Manning,and E.M.Pohle,“Relationships of Staple Length in Grease Wool and Resultant Top,”TextileResearch Journal,Vol 21,October 1951,pp.757762.3For 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.4The 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 The test method is used for the determination of theaverage unstretched staple length and the staple length distri-bution of a lot of wool in order to assign length classes whendetermining the conformance of lots and shipments to lengthspecifications.5.3 In this test method,the size of a lot covered by the testprocedure is limited to not more than 200 packages per test.Any