1、Designation:D505200(Reapproved 2010)Standard 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
2、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 perme
3、-ability of leather 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 equi
4、valents,therefore,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
5、standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1610 Practice for Conditioning Leather and Leather Prod-ucts for Testing3.Summary of Test Method3.1 In this test method th
6、e 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 the relative com
7、fort 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 area is 0.0025 m2,
8、or 25 cm2,made ofbrass or other non-corrosive metal.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 cabinet,or a chamber withcirculated air maintained at standard condition(23 6 1C and50 6 4%relative humidity).5.5 Fan,c
9、apable of maintaining an air-flow over the surfaceof the Permeability Apparatus at a velocity of at least 500ft/min 254 m/s.6.Reagents and Materials6.1 Dessicant,consisting of fresh 8 mesh anhydrous cal-cium chloride.6.2 Microcrystalline Wax,with a melting point of 70C orlower.7.Procedure7.1 All spe
10、cimens 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 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 di
11、sh,which must be done after each weighing,will mix thedesiccant.Place the specimen,with the grain side downward,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
12、 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 by1This tes
13、t method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical PropertiesCurrent edition approved Oct.1,2010.Published November 2010.Originallyapproved in 1990.Last previous edition approved in 2005 as D5052-00(2005).DOI:10.1520
14、/D5052-00R10.2For 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
15、 Box C700,West Conshohocken,PA 19428-2959.United States1 applying a coat of petroleum jelly to the edge and chilling thetemplate prior to use.)7.3 Place the complete assembly in the constant temperatureand humidity chamber,specimen side up.Adjust the air flow sothat the velocity over the specimen sh
16、all be at least 500 ft/min254 m/s.At the end of 1 h,weigh the assembly to the nearest0.001 g.This will be considered the“initial weight.”Shake theassembly after weighing to redistribute the surface of thedesiccant.(The assembly shall preferably be weighed in theconstant temperature and humidity chamber.If this is notpossible,the assemblies can be removed and weighed one at atime,provided they are returned to the chamber in 2 min orless.)Weigh the assembly at 1h intervals shaking the assem-bly af