ASTM_D_3773_-_D_3773M_-_10_2014.pdf

Designation:D3773/D3773M10(Reapproved 2014)Standard Test Methods forLength of Woven Fabric1This standard is issued under the fixed designation D3773/D3773M;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 These test methods cover four options for measuringfabric length and are applicable to full rolls or bolts ofmaterials.1.2 There are four approved options of measuring length asfollows:1.2.1 Option AHand(Section 6).1.2.2 Option BDrum(Section 7).1.2.3 Option CClock(Section 8).1.2.4 Option DFolding(Section 9).1.3 The values stated in either SI units or in U.S.customaryunits shall be regarded separately as standard.The values statedin each system may not be exact equivalents;therefore,eachsystem must be used independently of the other,withoutcombining values in any way.1.4 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 TextilesD1776 Practice for Conditioning and Testing TextilesD4850 Terminology Relating to Fabrics and Fabric TestMethodsE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 For all terminology relating to D13.60,Fabric TestMethods,Specific,refer to Terminology D4850.3.1.1 The following terms are relevant to this standard:length,stable fabric,woven fabric3.2 For definitions of other textile terms used in this testmethod,refer to Terminology D123.4.Summary of Test Methods4.1 The length is measured from one end of the fabric to theother,using a suitable graduated device,or apparatus asdescribed in the option used.5.Conditioning5.1 Condition the specimens as directed in Practice D1776.5.2 When full rolls or bolts of fabric cannot be properlyconditioned in a reasonable time with available facilities,perform the tests without conditioning and report the actualconditions prevailing at the time of the test.Such results maynot correspond with the results obtained after testing in thestandard atmosphere for testing textiles.6.Option AHand6.1 Significance and UseThe hand method specifies thatthe length of a fabric be measured in a relaxed tension-freemanner.This test method is the referee method to which allother test methods shall be compared for the establishment oftheir accuracy.This test method can be used for acceptancetesting,although it is not used as a general practice because itis too time consuming.6.1.1 In case of a dispute arising from differences inreported test values when using Test Methods D3773 foracceptance testing of commercial shipments,the purchaser andsupplier should conduct comparative tests to determine if thereis a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspecimens which are as homogeneous as possible and whichare from 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 two1These test methods are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.60 on Fabric TestMethods,Specific.Current edition approved July 1,2014.Published August 2014.Originallyapproved in 1989.Last previous edition approved in 2010 as D3773 10.ReplacesSections 6 to 12 of Methods D1910 64(1975),Test for Construction Character-istics of Woven Fabrics.DOI:10.1520/D3773_D3773M10R14.2For 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 laboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before testing is begun.If a bias is found,either itscause must be found and corrected or the purchaser and thesupplier must agree to interpret future test results in the light ofthe known bias.6.2 Apparatus:6.2.1 Flat Horizontal Surface,at least 3 m 3 yd long andhaving a width equal to or greater than the widest fabric to bemeasured.6.2.2 Length-Measuring Device,metal rule or steel tape,1m 1 yd minimum length graduated in 1 mm 116in.units,and6.2.3 Pins,suitable for use as markers.6.3 SamplingTake a