ASTM_D_2646_-_18.pdf

Designation:D264618Standard Guide forBacking Fabric Characteristics of Pile Yarn Floor Coverings1This standard is issued under the fixed designation D2646;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 guide covers the procedures listed as follows fortesting woven,knitted and nonwoven backing fabrics designedfor use in the manufacture of pile yarn floor coverings.Theprocedures appear in the following order:SectionBow and Skewness of Woven Fabrics8Breaking Force of Woven and Nonwoven Fabrics15Breaking Force After Tufting of Woven and Nonwoven Fabrics16Extractable Matter9Fabric Count of Woven Fabrics12Fabric Count of Knitted Fabrics13Length of Woven Fabrics11Mass per Unit Area(Weight)of Woven Fabrics14Width of Woven Fabrics101.2 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 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 Practice for Conditioning and Testing TextilesD2257 Test Method for Extractable Matter in TextilesD3773 Test Methods for Length of Woven FabricD3774 Test Method for Width of Textile FabricD3775 Test Method for End(Warp)and Pick(Filling)Countof Woven FabricsD3776 Test Methods for Mass Per Unit Area(Weight)ofFabricD3882 Test Method for Bow and Skew in Woven andKnitted FabricsD3887 Specification for Tolerance for Knitted Fabrics(Withdrawn 2017)3D5034 Test Method for Breaking Strength and Elongation ofTextile Fabrics(Grab Test)D5684 Terminology Relating to Pile Floor Coverings3.Terminology3.1 For definitions of terms relating to Pile Floor Coverings,D13.21,refer to Terminology D5684.3.1.1 The following terms are relevant to this standard:backing fabric,carpet,dents per unit width,extractable matter,finished,finished pile yarn floor covering,floor covering,nonwoven fabric,pile,pile yarn floor covering,textile floorcovering,tufted fabric,wale,wires per unit width.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Methods,General4.1 A summary of the directions prescribed for the determi-nation of specific properties is stated in the appropriate sectionsof specific test methods.5.Significance and Use5.1 These test methods may be used for acceptance testingof commercial shipments;however,caution is advised becauseinformation about between interlaboratory precision is incom-plete.Comparative tests as directed in 5.1.1 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 isstatistical bias between them using competent statistical assis-tance.As a minimum,use test samples for such comparative1This guide is under the jurisdiction of ASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.Current edition approved Jan.1,2018.Published February 2018.Originallyapproved in 1967.Last previous edition approved in 2011 as D2646 11.DOI:10.1520/D2646-18.2For 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 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 tests that are as homogeneous as possible,drawn from the samelot of material as the samples that resulted in the disparateresults during initial testing,and that are randomly assigned inequal numbers to each laboratory for testing.The test results