ASTM_D_2098_-_21.pdf

Designation:D209821Standard Test Method forDynamic Water Resistance of Shoe Upper Leather by theDow Corning Leather Tester1This standard is issued under the fixed designation D2098;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of the dy-namic water resistance of shoe upper leather by means of theDow Corning Tester.It is applicable to all types of shoe upperleather.This test method does not apply to wet blue or wetwhite.1.2 Initial water penetration and water absorption can bemeasured.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:2D1610 Practice for Conditioning Leather and Leather Prod-ucts for TestingD2099 Test Method for Dynamic Water Resistance of ShoeUpper Leather by the Maeser Water Penetration Tester3.Significance and Use3.1 This test method is intended to estimate the waterresistance of shoe upper leather.The flex imparted to theleather is a magnification of the flex given the vamp of the shoein actual wear.NOTE1There is an indication that this test method cannot be usedinterchangeably for specification purposes with Test Method D2099.4.Apparatus4.1 Balance,sensitive to 0.01 g.4.2 Dow Corning Leather Tester,as shown in Fig.1,or itsequivalent.The essential features of the machine are asfollows:4.2.1 A specimen holder made of two vertical clamps.Eachclamp shall have two stainless steel arms(7.5 in.by 0.5 in.by0.5 in.(190.5 mm by 12.7 mm by 12.7 mm),one arm fixed,the other moveable.One clamp shall be mounted on ahorizontal reciprocating shaft,that is,attached by a connectinglink to a motor driven eccentric,which turns at 60 r min.Thebottom of the clamps shall be in the same horizontal plane.Inone rotation of the eccentric,the minimum distance betweenclamps shall be 1.50 in.6 0.01 in.(38.1 mm 6 0.25 mm)(inside measurement)and the maximum distance betweenclamps 2.50 in.6 0.01 in.(63.5 mm 6 0.25 mm)(insidemeasurement).4.2.2 Water Tank made of stainless steel or other noncorro-sive material.It shall be of such a size that it can be placedaround the clamps,and of such a depth that when in positionfor use,the top of the pan is at least 2.5 in.(63.5 mm)abovethe bottom of the clamps,and the bottom of the pan is at least0.5 in.(12.7 mm)below the bottom of the clamps.4.2.3 Two systems shall be used to record the number ofcycles through which the specimen is flexed.One shall be amechanical reset counter connected to the movable clamp.Theother system shall be electrical.The resistance across theelectrodes shall be 7500 ohms 6 500 ohms.The sensingelectrode shown is inside a leather specimen filled withstainless-steel balls.The common electrode is in a salt solutionwhich is in continuous contact with the specimen duringflexing.Switch S when manually closed starts an electrical1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.03 on Footwear.This testmethod was developed in cooperation with the American Leather Chemists Assn.Current edition approved Dec.1,2021.Published January 2022.Originallyapproved in 1962 as D209862T.Last previous edition approved in 2013 asD209813.DOI:10.1520/D2098-21.2For 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.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?impulse counter actu