ASTM_D_7255_-_14.pdf

Designation:D725514Standard Test Method forAbrasion Resistance of Leather(Rotary Platform,AbraserMethod)1This standard is issued under the fixed designation D7255;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 determination of the abra-sion resistance of leather using the rotary platform abraser.NOTE1This test method is similar but not equivalent to ISO 17076-1,and results should not be directly compared between the two methods.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and to determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1517 Terminology Relating to LeatherD1610 Practice for Conditioning Leather and Leather Prod-ucts for TestingD2813 Practice for Sampling Leather for Physical andChemical TestsG195 Guide for Conducting Wear Tests Using a RotaryPlatform Abraser2.2 Other Standards:3ISO 17076-1 Leather-Determination of abrasion resistancePart 1-Taber method3.Terminology3.1 Definitions:3.1.1 abrasera wear testing instrument,also referred to asa rotary platform tester or abrader.3.1.2 abrasionthe wearing away of any part of a materialby rubbing against another surface.3.1.3 abrasion cyclein abrasion testing,one or moremovements of the abradant across a material surface,or thematerial surface across the abradant,that permits a return to itsstarting position.In the case of the rotary platform test method,it consists of one complete rotation of the specimen.3.1.4 durabilitythe ability to withstand deterioration orwear out in use,including the effects of abrasion.3.1.5 resurfacethe preparation of an abrasive wheel on aresurfacing disk or diamond tool wheel refacer,prior to use intesting.3.2 For definitions of other leather terms used in this testmethod,refer to Terminology D1517.4.Summary of Test Method4.1 Aspecimen is abraded using rotary rubbing action undercontrolled conditions of pressure and abrasive action.The testspecimen,mounted on a turntable platform,turns on a verticalaxis,against the sliding rotation of two abrading wheels.Oneabrading wheel rubs the specimen outward toward the periph-ery and the other,inward toward the center.The resultingabrasion marks form a pattern of crossed arcs over an area ofapproximately 30 cm2.Resistance to abrasion is evaluated byvisual inspection of damage to the specimen or change inweight,as described in Section 14.5.Significance and Use5.1 The resistance of leather to abrasion,as measured on atesting machine in the laboratory,is generally only one ofseveral factors contributing to wear performance or durabilityas experienced in the actual use of the material.While“abrasion resistance”(often stated in terms of the number ofabrasion cycles)and“durability”are frequently related,therelationship varies with different end uses and different factorsmay be necessary in any calculation of predicted durabilityfrom specific abrasion data.This test method provides acomparative ranking of material performance,which can beused as an indication of relative end-use performance.5.2 The resistance of leather to abrasion may be affected byfactors including test conditions,type of abradant,pressure1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical Properties.Current edition approved April 1,2014.Published May 2014.Originallyapproved in 2006.Last previous edition approved in 2006 as D7255-061.DOI:10.1520/D7255-14.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 between the specimen and abradant,mounting or tension of thespecimen,and type,kind,or amount of finishing materials.5.3 Abrasion tests utilizing the rotary platform abraser maybe subject to variation due to changes in the abradant duringspecific tests.Depending on abradant type and test specimen,the wheel surface may change(that is,become clogged)due tothe pick up of finishing or other materials from test specimensand must be resurfaced at regularly defined intervals.5.4 The measurement of the relative amount of