1、Designation: D5052 18Standard 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 p
2、arentheses 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-abili
3、ty 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 equivale
4、nts, 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 thi
5、s 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 Deci
6、sion 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 Testing3. Summa
7、ry of Test Method3.1 In this 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 sev
8、eral factorscontributing to 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,18 in. th
9、ick and 2.225 60.025 in. in diameter area is 0.0025 m2,or25cm2, 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 Cham
10、ber, 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, 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
11、.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 specimens shall be conditioned as prescribed inPractice D1610. Conditioning other than as prescribed shall benoted in the
12、results.7.2 Fill the aluminum cup with the desiccant to a heightbetween18 and14 in. 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 downw
13、ard,1This test 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, 2018. Published October 2018. Originallyapproved in 1990. Last previous edition approved in 2010 as D5052 - 0
14、0 (2010).DOI: 10.1520/D5052-18.2For 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,
15、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
16、 Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1over 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
17、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 byapplying a coa
18、t of petroleum jelly to the edge and chilling thetemplate prior to use.) If using mechanically sealed cups,ensure that the caps are adequately tight to prevent leakage.7.3 Place the complete assembly in the constant temperatureand humidity chamber, specimen side up.Adjust the air flow sothat the vel
19、ocity over the specimen shall 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 theconsta
20、nt 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 after each weighing until three or more successive weigh-ings show
21、 weight increases that are equal within 0.02 g. (Theweighing intervals can be extended longer for specimens withlow permeability.) Total time should be no less than 4 h and notmore than 24 h. The last weighing will be recorded as the “finalweight.”8. Calculation8.1 Calculate the permeability to wate
22、r vapor of the testspecimen by one of the following equations:P 5IAT(1)where:P = water vapor permeability in grams per square centimetreper hour,I = increase in weight in grams in total time,A = area of the exposed specimen in square centimetres(normally 25), andT = total time of exposure in hours b
23、etween intial and finalweighings.ORP 5IAT(2)where:P = water vapor permeability in grams per square centimetreper 24 h (day),I = increase in weight in grams in total time multiplied by24,A = area of the exposed specimen in square metres (nor-mally 0.0025), andT = total time of exposure in hours betwe
24、en intial and finalweighings.9. Report9.1 The average of the results obtained from the testspecimens shall be the water vapor permeability of the sample.10. Precision and Bias10.1 This test method is adopted from the procedures of theAmerican Leather Chemists Association3where it has longbeen in use
25、 and where it was approved for publication beforethe inclusion of precision and bias statements were mandated.The original interlaboratory test data is no longer available.The user is cautioned to verify by the use of referencematerials, if available, that the precision and bias of this testmethod i
26、s adequate for the contemplated use.3American Leather Chemists Association, Office of Secretary-Treasurer, Cam-pus Station, Cincinnati, OH 45221.FIG. 1 Permeability ApparatusD5052 182ASTM International takes no position respecting the validity of any patent rights asserted in connection with any ite
27、m mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical comm
28、ittee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a m
29、eeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive
30、, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 2 Spining Stud for Water Vapor Permeability DishD5052 183
