ASTM_D_6770_-_21.pdf

Designation:D677021Standard Test Method forAbrasion Resistance of Textile Webbing(Hex Bar Method)1This standard is issued under the fixed designation D6770;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.Scope*1.1 This test method covers the determination of abrasionresistance of textile webbing using a hex bar abrasion tester.1.1.1 The resistance is expressed as a percentage of retainedbreaking strength.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and 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/D1776M Practice for Conditioning and Testing Tex-tilesD4850 Terminology Relating to Fabrics and Fabric TestMethodsD6775 Test Method for Breaking Strength and Elongation ofTextile Webbing,Tape and Braided MaterialE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 For all terminology relating to Fabrics,refer to Termi-nology D4850.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 Abrasion resistance is measured by subjecting the speci-men to unidirectional reciprocal rubbing over a specific barunder specified conditions of tension,stroke length and time.Resistance to abrasion is evaluated by determining the percentretention of breaking force of an abraded specimen comparedto an unabraded specimen.5.Significance and Use5.1 The measurement of the resistance to abrasion of textilewebbing is very complex.The resistance to abrasion is affectedby many factors that include the inherent mechanical propertiesof the fibers;the dimensions of the fibers;the structure of theyarns;the construction of the webbing;the type,kind,andamount of treatment added to the fibers,yarns,or webbing;thenature of the abradant;the variable action of the abradant overthe specimen area abraded;the tension on the specimen;thepressure between the specimen and the abradant;and thedimensional changes in the specimen.5.2 The resistance of textile webbing to abrasion as mea-sured by this test method does not include all the factors whichaccount for wear performance or durability in actual use.Whilethe abrasion resistance stated in terms of the number of cyclesand durability(defined as the ability to withstand deteriorationor wearing out in use,including the effects of abrasion)arefrequently related,the relationship varies with different enduses.Different factors may be necessary in any calculation ofpredicted durability from specific abrasion data.5.3 Laboratory tests may be reliable as an indication ofrelative end use in cases where the difference in abrasionresistance of various materials is large,but they should not berelied upon where differences in laboratory test findings aresmall.In general,the results should not be relied upon forprediction of performance during actual wear life for specificend uses unless there are data showing the specific relationshipbetween laboratory abrasion tests and actual wear in theintended end use.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,Specific.Current edition approved July 1,2021.Published September 2021.Originallyapproved in 2002.Last previous edition approved in 2019 as D677007(2019).DOI:10.1520/D6770-21.2For 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.*A Summary of Changes section appears at the end of this standardCopyright 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)C