1、Designation: D 5052 00 (Reaproved 2005)Standard Test Method forPermeability of Leather to Water Vapor1This standard is issued under the fixed designation D 5052; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers the determination of
3、the perme-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
4、 exact equivalents, 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
5、the user of this 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:2D 1610 Practice for Conditioning Leather and LeatherProducts for Testing3. Summary of Test Method3.1 In t
6、his 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
7、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. thick and 2.225 60.025 in.
8、in diameter area is 0.0025 m2,or25cm2, 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 and
9、50 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 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 po
10、int of 70C orlower.7. Procedure7.1 All specimens shall be conditioned as prescribed inPractice D 1610. Conditioning other than as prescribed shall benoted in the 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 F
11、ig. 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,over the desiccant and center with the cup. Place the templateflat on the specimen and center as nearly as possible with thecup. Apply
12、 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 t
13、he template from the hardened wax is facilitated byapplying a coat of petroleum jelly to the edge and chilling thetemplate prior to use.)1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical PropertiesCurrent e
14、dition approved April 1, 2005. Published May 2005. Originallyapproved in 1990. Last previous edition approved in 2000 as D 505200.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informat
15、ion, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3 Place the complete assembly in the constant temperatureand humidity chamber, specimen side up.Adjust the air flo
16、w sothat the velocity 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 weig
17、hed 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 after each weighing until three or more successive
18、 weigh-ings show 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 perm
19、eability to water vapor of the testspecimen by one of the following equations:P 5IAT(1)where:P = water vapor permeability in grams per square centi-metre per 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 e
20、xposure in hours between intial and finalweighings.ORP 5IAT(2)where:P = water vapor permeability in grams per square centi-metre per 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 exp
21、osure in hours between 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
22、 has longbeen in use 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
23、of this testmethod is adequate for the contemplated use.3American Leather Chemists Association, Office of Secretary-Treasurer, Cam-pus Station, Cincinnati, OH 45221.FIG. 1 Permeability ApparatusD 5052 00 (Reaproved 2005)2ASTM International takes no position respecting the validity of any patent righ
24、ts asserted in connection with any item 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
25、time by the responsible technical committee 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 wil
26、l receive careful consideration at a meeting 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 AST
27、M International, 100 Barr Harbor Drive, 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).FIG. 2 Spining Stud for Water Vapor Permeability DishD 5052 00 (Reaproved 2005)3
