ASTM_D_6693_-_D_6693M_-_04_2015e1.pdf

Designation:D6693/D6693M04(Reapproved 2015)1Standard Test Method forDetermining Tensile Properties of NonreinforcedPolyethylene and Nonreinforced Flexible PolypropyleneGeomembranes1This standard is issued under the fixed designation D6693/D6693M;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.1NOTEDesignation was changed to dual and units information was corrected editorially in June 2015.1.Scope1.1 This test method covers the determination of the tensileproperties of nonreinforced geomembranes in the form ofstandard dumbbell-shaped test specimens when tested underdefined conditions of pretreatment,temperature,and machinespeed.1.2 This test method can be used for testing materialsthickness between 0.25 mm 0.010 in.and 6.3 mm 0.25 in.NOTE1This test method is not intended to cover precise physicalprocedures.The constant rate of crosshead movement of this test lacksaccuracy from a theoretical standpoint.A wide difference may existbetween the rate of crosshead movement and the rate of strain of thespecimen indicating that the testing speeds specified may disguiseimportant effects or characteristics of these materials in the plastic state.Further,it is realized that variations in the thicknesses of test specimens,as permitted by this test method,produce variations in the surface-volumeratios of such specimens,and that these variations may influence the testresults.Hence,where directly comparable results are desired,all samplesshould be of equal thickness.Special additional tests should be used wheremore precise physical data are needed.1.3 Test data obtained by this test method are relevant andmay be appropriate for use in engineering design with consid-eration of test conditions as compared with in-service condi-tions.1.4 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.1.5 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:2D638 Test Method for Tensile Properties of PlasticsD4000 Classification System for Specifying Plastic Materi-alsD4439 Terminology for GeosyntheticsD5199 Test Method for Measuring the Nominal Thicknessof GeosyntheticsD5994/D5994M Test Method for Measuring Core Thicknessof Textured GeomembranesE4 Practices for Force Verification of Testing MachinesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsDefinitions of terms applying to this testmethod appear in Terminology D4439.4.Significance and Use4.1 This test method is designed to produce tensile propertydata for the control and specification of nonreinforced poly-ethylene and flexible nonreinforced polypropylene geomem-branes.These data are also useful for qualitative characteriza-tion and for research and development.It may be necessary tomodify this procedure for use in testing certain materials asrecommended by the material specifications.Therefore,it isadvisable to refer to that materials specification before usingthis test method.Table 1 in Classification D4000 lists theASTM materials standards that currently exist.4.2 Tensile properties may vary with specimen preparation,test speed,and environment of testing.Consequently,where1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-branes.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 2001.Last previous edition approved in 2010 as D669304(2010).DOI:10.1520/D6693_D6693M-04R15E01.2For 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 precise comparative results are desired,these factors must becarefully monitored and controlled.4.2.1 It is realized that a material cannot be tested withoutalso testing the method of preparation of that material.Hence,when comparative tests of materials are desired,the care mustbe exercised to ensure that all samples are prepared in exactlythe same way,unless the test is to include the effects of samplepreparation.Similarly,for r