ASTM_D_5193_-_D_5193M_-_93_2012.pdf

Designation:D5193/D5193M93(Reapproved 2012)Standard Test Method forCoated FabricsAir Retention1This standard is issued under the fixed designation D5193/D5193M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last 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 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 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.Referenced Documents2.1 ASTM Standards:2D751 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 pressure.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 the 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 retain 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 of 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 fabrics as cited in Test Methods D751 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 tests,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 exceed three months.8.Test Specimens8.1 Three circular test specimens,330 6 3 mm 13 6 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.NOTE1Specimen size is not critical.An apparatus which canaccommodate specimens having a diameter as small as 254 6 3 mm 106 0.1 in.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 Coated Fabrics,RubberThreads and Seals.Current edition approved May 1,2012.Published July 2012.Originally approvedin 1991.Last previous edition approved in 2007 as D5193/D5193M 93(2007).DOI:10.1520/D5193_D5193M-93R12.2For 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 Box C700,West Conshohocken,PA 19428-2959.United States1 9.Procedure9.1 Position the specimen in the test apparatus by 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 shall 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 coveraget