ASTM_D_5683_-_D_5683M_-_95_2011e1.pdf

Designation:D5683/D5683M95(Reapproved 2011)1Standard Test Method forFlexibility of Roofing and Waterproofing Materials andMembranes1This standard is issued under the fixed designation D5683/D5683M;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.1NOTEUnits information was editorially revised in February 2011.1.Scope1.1 This test method measures the flexibility of roofing orwaterproofing sheet materials or membranes by bending thetest material over a block containing arcs of specific radii at astandard temperature.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.2.Referenced Documents2.1 ASTM Standards:2D1079 Terminology Relating to Roofing and Waterproofing3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D1079.4.Summary of Test Method4.1 Bend the five specimens of roofing or waterproofingsheet materials or membrane,conditioned at 4.4C 40F,(seeNote 1),over a block(see Fig.1)designed to provide arcs ofequal length with 6-mm 14-in.,13-mm 12-in.,19-mm34-in.,and 25-mm 1-in.radii,and the smallest radius isreported where cracking is not observed in any specimen.NOTE1Other test temperatures may be used in addition to the testsrequired at 4.4C 40F,and refrigerated conditioning chambers may beused instead of the water bath specified.Follow procedures outlined inSection 8,if refrigerated chamber is utilized;however,the plastic bag maybe omitted.5.Significance and Use5.1 This test method is designed to aid those interested inthe engineering properties of roofing and waterproofing sheetmaterials and membranes.5.2 This test method enables a researcher to measure therelative flexibility of roofing and waterproofing sheet materialsand membranes under standard conditions in the laboratory.5.3 The data obtained from this test method will not permitprediction of the service life of a membrane.Membraneflexibility is important during application,and changes inflexibility are believed to be linked to the performance ofroofing and waterproofing membranes,but the actual linkbetween test data and performance is unknown and is depen-dent on the materials and exposure.6.Apparatus6.1 Water BathA bath with the capacity of at least 10 L2.5 gal and capable of maintaining a temperature of 4.4 60.1C 40 6 0.2F.6.2 Polyethylene BagsA sealable plastic bag for condi-tioning each group of test specimens.Commercial 1-galsealable polyethylene scrap or food storage bags can performthis function.6.3 Test BlockThe test block(see Fig.1)may be madefrom any hard durable material that conforms to the dimen-sions shown in Fig.1.It is designed to provide equal arclengths for arcs with 6-mm 14-in.,13-mm 12-in.,19-mm34-in.,and 25-mm 1-in.radii.7.Sampling7.1 This test method requires a total of one 152 by 305-mm6 by 12-in.sample from the sheet material or membrane.7.2 Cut five 25 by 152-mm 1 by 6-in.specimens in themachine direction(the length)and five 1 by 6-in.specimens inthe cross direction(the width)of each sample.1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.20 onRoofing Membrane Systems.Current edition approved Jan.1,2011.Published February 2011.Originallyapproved in 1995.Last previous edition approved in 2005 as D5683 95(2005).DOI:10.1520/D5683-95R11E01.2For 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 8.Procedure8.1 Exclude as much air as possible and seal each group offive specimens in a plastic bag.8.2 Condition the specimens in each plastic bag in a waterbath at 4.4 6 0.1C 406 0.2F for at least 1 h.8.3 One at a time,remove the specimens from the condi-tioning medium.Quickly clamp a narrow end of the specimento the test block(see Fig.1)with thumb pressure on the slidingangle clamp,with the side most likely to crack(usually the sideintended for exposure to the weather)of the sample upward.Bend the specimen over the test block with a smooth move-ment requiring 2 6 1 s,and hold in place over the radius bendfor 15 6 1 s.Record the smallest radius where cracking is notevident to the unaided eye.For the purposes of this testmethod,any surface crack longer than 3 mm 18in.isconsidered failure at the radius where the crack appears(seeNote