1、Designation:D505218Standard Test Method forPermeability of Leather to Water Vapor1This standard is issued under the fixed designation D5052;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 parenth
2、eses 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 perme-ability of leath
3、er to water vapor by measuring the rate at whichwater vapor passes through a test specimen.This test methoddoes not apply to wet blue.1.2 The values stated in either inch-pound or SI units are tobe regarded separately as standard.The values stated in eachsystem may not be exact equivalents,therefore
4、,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in nonconformance with thestandard.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 estab
5、lish 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 fo
6、r 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 Testing3.Summary of Test Method3.1 In th
7、is test method the water vapor permeability ismeasured after the test specimen is exposed to moist air on oneside and dry air on the other side.4.Significance and Use4.1 This test method is intended for use on all types ofleathers.4.2 Water vapor permeability is one of several factorscontributing to
8、 the relative comfort of footwear,handwear,andgarments.5.Apparatus5.1 Analytical Balance,accurate to 0.001 g.5.2 Permeability Apparatus,as shown in Fig.1.It shallconsist of an aluminum cup having approximately the dimen-sions shown in Fig.2 and a template,18in.thick and 2.225 60.025 in.in diameter a
9、rea is 0.0025 m2,or 25 cm2,made ofbrass or other non-corrosive metal.As an alternate,aluminumcups of the same approximate dimensions and mechanicallysealed can be used.5.3 Steel Stamping Die,2.75 6 0.1 in.in diameter.5.4 Constant Temperature and Humidity Chamber,whichmay be either a laboratory,a cab
10、inet,or a chamber withcirculated air maintained at standard condition(23 6 1C and50 6 4%relative humidity).5.5 Fan,capable of maintaining an air-flow over the surfaceof the Permeability Apparatus at a velocity of at least 550 6 50ft/min 2.79 6 0.25 m/s.6.Reagents and Materials6.1 Dessicant,consistin
11、g of fresh 8 mesh anhydrous cal-cium chloride.6.2 Microcrystalline Wax,with a melting point of 70C orlower.7.Procedure7.1 All specimens shall be conditioned as prescribed inPractice D1610.Conditioning other than as prescribed shall benoted in the results.7.2 Fill the aluminum cup with the desiccant
12、to a heightbetween18and14in.3.2 to 6.4 mm below the level of therim,as shown in Fig.1.Leave enough space so that shaking ofthe dish,which must be done after each weighing,will mix thedesiccant.Place the specimen,with the grain side downward,1This test method is under the jurisdiction of ASTM Committ
13、ee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical PropertiesCurrent edition approved Oct.1,2018.Published October 2018.Originallyapproved in 1990.Last previous edition approved in 2010 as D5052-00(2010).DOI:10.1520/D5052-18.2For referenced ASTM standards,visit the
14、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 State
15、sThis 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
16、(TBT)Committee.1 over the desiccant and center with the cup.Place the templateflat on the specimen and center as nearly as possible with thecup.Apply a slight pressure to the template to ensure goodcontact between the rim of the cup,the specimen,and thetemplate around the entire rim.Fill the groove formed by thelip of the cup and the edge of the template with melted wax thatis allowed to harden before the template is removed.(Theremoval of the template from the hardened wax is facilitated byappl