ASTM_C_736_-_12_2017.pdf

Designation:C73612(Reapproved 2017)Standard Test Method forExtension-Recovery and Adhesion of Latex Sealants1This standard is issued under the fixed designation C736;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 test method covers a laboratory procedure for thedetermination of the extension-recovery and adhesion of latexsealants.1.2 The values stated in SI(metric)units are to be regardedas the standard.The values given in parentheses are providedfor information only.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.NOTE1A related ISO standard is ISO 7389.Users should compare todetermine how the ISO standard differs from this test method.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC1375 Guide for Substrates Used in Testing Building Sealsand Sealants2.2 ISO Standard:3ISO 7389 Building ConstructionSealantsDetermination ofElastic Recovery3.Terminology3.1 DefinitionsRefer to Terminology C717 for definitionsof the terms used in this test method.4.Summary of Test Method4.1 A joint of prescribed dimensions,between glass andaluminum plates is filled with the sealant.After an agingperiod,the joint width is increased 25%,the force is removed,and the specimen is permitted to recover.The amount ofrecovery and the percent of adhesion loss are measured.5.Significance and Use5.1 This test method evaluates the performance of a latexsealant in joints subjected to a limited amount of extension.6.Apparatus6.1 Extension Machine that can be operated at a steady rateof 12.7 mm/min(0.5 in./min)and held at constant extension for5 min.6.2 Aluminum Alloy Plates,six,anodized,6.4 by 25.4 by76.2 mm(14by 1 by 3 in.).Plates shall conform to GuideC1375.6.3 Glass Plates,six,6.4 by 25.4 by 76.2 mm(14by 1 by3 in.).Plates shall conform to Guide C1375.6.4 U Shaped Spacers,six,as shown in Fig.1(a)made of arigid,nonadhering material such as polyethylene,TFE-fluorocarbon,or release-covered metal.6.5 Metal C Clamps,twelve.6.6 Circulating Air Oven,capable of maintaining 50 6 1C(122 6 2F).7.Sampling7.1 Take the sealant to be tested directly from the containeras commercially supplied by the manufacturer.8.Test Specimens8.1 Prepare a test specimen as follows:Apply a bead ofsealant,12.7 by 12.7 by 50.8 mm(12by12by 2 in.)betweenparallel glass and anodized aluminum plates as shown in Fig.1(b),using rigid,nonadhering spacer bars.Use the C-clamps tohold the test assembly during the filling and subsequent curingand handling of the specimens.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealantsand is the direct responsibility of Subcommittee C24.30 onAdhesion.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 1972.Last previous edition approved in 2012 as C736 12.DOI:10.1520/C0736-12R17.2For 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.3Available from theAmerican National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 8.2 Prepare five additional specimens as described in 8.1.NOTE2The glass and aluminum plates shall be cleaned with methylethyl ketone or similar solvent followed by a thorough cleaning with adetergent solution and a final rinse with distilled or deionized water andthen air dried prior to assembly of specimens.9.Conditioning9.1 Cure the six test specimens for 7 days at standardconditions,then for 7 days at 50 6 1C(122 6 2F).After the14-day cure period,condition the specimens for 2 h at standardconditions.10.Procedure10.1 Remove the spacers(Fig.1(c)and insert each speci-men in turn in the extension machine.At the rate of 12.7