ASTM_D_3936_-_21.pdf

Designation:D393621Standard Test Method forResistance to Delamination of the Secondary Backing ofPile Yarn Floor Covering1This standard is issued under the fixed designation D3936;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 resis-tance to delamination of the secondary backing applied to somepile yarn floor coverings.1.2 This test method is applicable to all backings includingnatural manufactured fibers or attached cushion.1.3 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.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD4697 Guide for Maintaining Test Methods in the UsersLaboratory(Withdrawn 2009)3D5684 Terminology Relating to Pile Floor CoveringsE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 For all other terminology related to Pile FloorCoverings,D13.21,see Terminology D5684.3.1.1 The following terms are relevant to this standard:attached cushion,carpet,constant-rate-of-extension,finished,finished pile yarn floor covering,floor covering,peak force,pile,pile yarn floor covering,resistance to delamination,secondary backing,textile floor covering,tufted fabric.3.2 For all other terminology related to textiles,see Termi-nology D123.4.Summary of Test Method4.1 A specimen is separated manually for a distance ofabout 1.5 in.(38 mm).Each layer then is placed in opposingclamps of a tensile tester,and the force to continue theseparation for a specified distance is recorded.The peak forcesin specified length intervals are averaged and the resistance todelamination calculated.5.Significance and Use5.1 This test method is used for acceptance testing ofcommercial shipments.Comparative tests as directed in 5.2may be advisable.5.2 In a case of a dispute arising from differences inreported test results when using this test method,the purchaserand the supplier should conduct comparative tests to determineif there is a statistical bias between their laboratories.Compe-tent statistical assistance is recommended for the investigationof bias.As a minimum,the two parties should take a group oftest samples that are as homogenous as possible and are froma lot of material of the type in question.The test samples thenshould be assigned randomly in equal numbers to eachlaboratory for testing.The average results from the twolaboratories should be compared using a statistical 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 with consid-eration to the known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.Current edition approved Jan.1,2021.Published January 2021.Originallyapproved in 1980.Last previous edition approved in 2017 as D3936 17.DOI:10.1520/D3936-21.2For 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.15.3 This test method is useful to evaluate quality and costcontrol during the manufacture of pile ya