1、Designation: D 5193/D 5193M 93 (Reapproved 2007)Standard Test Method forCoated FabricsAir Retention1This standard is issued under the fixed designation D 5193/D 5193M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of las
2、t revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes the determination of theretention of air by fabrics coated on one or both sides withrubber.1.2
3、 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the
4、 standard.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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Re
5、ferenced Documents2.1 ASTM Standards:2D 751 Test Methods for Coated Fabrics3. Summary of Test Method3.1 A membrane specimen of the material to be tested isplaced across a circular orifice in the measuring apparatus. Thebottom surface of the membrane is exposed to a source of airat a specified pressu
6、re. The top surface of the specimen iscovered with water or soap solution. Absence of the appear-ance of air bubbles on the top surface of the material during aspecified exposure period indicates the lack of pin-holes, leaks,or other similar defects. The coated fabric is then acceptable foruse in th
7、e intended application. This procedure is limited tomembranes or coated fabrics having a thickness of less than 3mm 0.125 in.4. Significance and Use4.1 This test method describes a procedure for evaluatingrubberized fabrics that are used to manufacture pneumaticarticles (that is, those that must ret
8、ain air in order to performsatisfactorily in an intended application). Examples of sucharticles are emergency rafts, life preservers, marine recre-ational equipment, floats, pontons, and warning or detectiondevices, such as buoys or weather balloons.5. Apparatus5.1 The test apparatus shall consist o
9、f the assembly shownin Fig. 1.5.2 If preferred, wing nuts or toggle clamps may be substi-tuted to facilitate assembly and disassembly of the apparatus,as long as an air-tight seal is maintained during testing.6. Test Conditions6.1 Unless otherwise specified, the standard conditions fortesting coated
10、 fabrics as cited in Test Methods D 751 shall beused. All specimens and equipment shall be preconditioned for1 h prior to conducting the test.7. Time Lapse Between Vulcanization and Testing7.1 For all purposes, the minimum time between vulcaniza-tion and testing shall be 16 h.7.2 For nonproduct test
11、s, the maximum time between vul-canization and testing shall be four weeks, and for evaluationsintended to be comparable, the tests, as far as possible, shouldbe carried out after the same time interval.7.3 For product tests, whenever possible, the time betweenvulcanization and testing should not ex
12、ceed three months.8. Test Specimens8.1 Three circular test specimens, 330 6 3mm136 0.1in. in diameter, shall be accurately cut from the coated fabric.Holes conforming to the size and location of the bolts, asshown in Fig. 1, shall be punched around the perimeter of eachpiece.NOTE 1Specimen size is n
13、ot critical. An apparatus which can accom-modate specimens having a diameter as small as 254 6 3mm106 0.1in. is acceptable. Report the specimen size used in 10.1.4.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Co
14、ated Fabrics andRubber Thread.Current edition approved May 1, 2007. Published June 2008. Originallyapproved in 1991. Last previous edition approved in 2002 as D 5193/D 5193M 93(2002).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.
15、org. For Annual Book of ASTMStandards volume information, 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.9. Procedure9.1 Position the specimen in the test apparatus by
16、aligningthe punched holes with the projecting bolts and carefullypressing it into position in contact with the rubber gasket. If thefabric is coated on one side only, that side shall face down. Incases where the fabric is coated on both sides, the sidenormally exposed to the inflating air pressure s
17、hall be facedown. Place the upper section of the test assembly over thespecimen and tighten the bolts securely. Pour 1 to 2 mm 0.040to 0.080 in. of water, or preferably soap solution, onto theexposed surface of the specimen to ensure complete coveragethroughout the duration of the test. Gradually in
18、crease the airpressure until a level of 70 kPa 10 psi has been reached. Airbubbles initially appearing on the specimen surface, producedby air pressure during closure of the space between the clothand coating, shall be removed. Maintain the test pressure for atleast five, but preferably ten minutes
19、and observe for theappearance of air bubbles. Failure is defined as the continuedappearance of surface air bubbles in any of the three specimenstested as taken from the sample of coated fabric beingevaluated.10. Report10.1 Report the following information:10.1.1 That the test was performed in accord
20、ance with TestMethod D 5193/D 5193M,10.1.2 Description of the material tested, including thethickness and type of coating,10.1.3 Temperature of the test,10.1.4 Diameter of the test specimen, and10.1.5 Whether the material passed or failed the air reten-tion test.11. Precision and Bias11.1 No stateme
21、nt is made about either the precision or thebias of this test method. Results are reported on an individualpass/fail basis, thus no comparison with a standard referencematerial can be made.12. Keywords12.1 air retention; coated fabrics; pneumatic end items.ASTM International takes no position respec
22、ting the validity of any patent rights 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 sta
23、ndard is subject to revision at any 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 Internati
24、onal Headquarters. Your comments will 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
25、.This standard is copyrighted by ASTM 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. 1 Air Retention Test ApparatusD 5193/D 5193M 93 (2007)2
