ASTM_D_3393_-_91_2014.pdf

Designation:D339391(Reapproved 2014)Standard Specification forCoated FabricsWaterproofness1This standard is issued under the fixed designation D3393;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 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification sets forth the minimum requirementsfor hydrostatic resistance of fabrics coated with rubber orplastics.Coated fabrics satisfying these requirements are con-sidered to be waterproof.1.2 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.1.3 The following precautionary caveat pertains only to thetest method portion of this specification:This standard does notpurport to address all of the safety concerns,if any,associatedwith its use.It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.2.Referenced Documents2.1 ASTM Standards:2D751 Test Methods for Coated FabricsD1566 Terminology Relating to Rubber3.Terminology3.1 Definitions:3.1.1 merrow seama sewn seam made to unite fabricpieces for coating:not to be included in the finished product.3.1.2 waterproofnessthe property of impenetrability byliquid water.(See Terminology D1566.)3.1.3 water repellencythe property of being resistant towetting by liquid water.(See Terminology D1566.)3.1.4 water resistancethe property of retarding both pen-etration and wetting by liquid water.(See TerminologyD1566.)4.Summary of Test Method4.1 Circular specimens of the coated fabric to be tested forwaterproofness are exposed to a specific hydrostatic pressure,as detailed in Sections 6 9,and the upper exposed surface isexamined visually for penetration of water.4.2 Records to document compliance with this specificationshall be maintained by producers and fabricators.Statisticallybased sampling plans may be utilized.In cases where resultsare in dispute,additional sampling and testing as agreed uponbetween the purchaser and the seller may be necessary.5.Significance and Use5.1 The purpose of this specification is to establish arecognized criterion for“waterproofness”in terms of a mini-mum hydrostatic resistance.The necessary definitions to pro-vide a common understanding of the meaning of this charac-teristic when it is used to describe a fabric coated with rubberor plastics are also given.The specification does not coverrequirements for water repellency or water resistance of fabricscoated with rubber or plastics.TEST METHOD6.Apparatus6.1 Hydrostatic Tester,capable of applying within 6 s apressure of 207 kPa(30 psi)on the specimen with an accuracyof 67.0 kPa(1.0 psi).The apparatus shall be equipped withtwo concentric ring clamps,having an inner diameter of 31.5 60.5 mm(1.24 6 0.02 in.)between which the specimens can beclamped in order to avoid slippage.The inside edges of the ringclamps that come into contact with the test specimen shall berounded to 0.3 to 0.5 mm(0.01 to 0.02 in.)to avoid cutting thespecimen.A seal shall be fitted on the lower clamp to preventleakage during the test.6.2 A type of equipment suitable for performing this test isdescribed in more detail in Section 37 of Test Methods D751.7.Test Specimens7.1 At least ten specimens shall be cut from samples takenat random from the roll of coated fabric being tested.Thesmallest dimension of the test specimen shall be at least 12.5mm(0.5 in.)greater than the outside diameter of the ring clampmechanism of the testing apparatus.Unless otherwise1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics,RubberThreads and Seals.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 1975.Last previous edition approved in 2009 as D3393 91(2009).DOI:10.1520/D3393-91R14.2For 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 specified,specimens shall be taken no nearer the selvage thanone tenth of the width of the coated fabric.If the fabric beingtested has any sewed or stitchless-jointed seams,excludingMerrow seams,the sample shall include specimens from theseam area which are cut so that the seam portion is in the centerof the specimen.8.Procedure8.1 Before clamping each specimen in the testing machine,bring the water level up flush with the top of the seal so that noair pocket exists between the water surface and the specimen.In the case of materials coated on one side only,place