Designation: C1756 − 17Standard Guide forComparing Seal or Sealant Behavior to ReferencePhotographs 1This standard is issued under the f i xed designation C1756; 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 guide provides photographs that illustrate sealantbehavior terms that have been def i ned by Committee C24.1.2 When available, photographs that better illustrate theseterms, or that illustrate additional terms def i ned by CommitteeC24, will be included in future editions of this standard.Photographs for consideration may be submitted to the com-mittee using the form in Appendix X1.1.3 The committee with jurisdiction over this standard is notaware of any comparable standards published by other orga-nizations.1.4 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, health and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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 Sealants3. Terminology3.1 The terms used in this guide are def i ned in TerminologyC717.4. Signif i cance and Use4.1 This guide is intended to be used in evaluating sealantconditions that occur in service, along with other diagnostictechniques in failure analysis. These standard reference photo-graphs have been selected and approved through ASTM’sconsensus balloting process to illustrate terms def i ned byCommittee C24.4.2 Not all of the terms illustrated here are failures, andthere are other failure mechanisms that affect sealants that arenot discussed in this guide. This guide is intended to be one ofa number of sources of information used in the evaluation ofsealant behavior.5. Reference Photographs5.1 Figs. 1-9 present a standard reference photograph foreach of the terms def i ned in Terminology C717, reprinted withtheir def i nitions.6. Keywords6.1 adhesion failure; chalking; cohesion failure; crazed; dirtpick-up; elastomeric joint sealant; f l uid migration; reversion;rundown; sag1 This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.10onSpecif i cations, Guides and Practices.Current edition approved Sept. 1, 2017. Published September 2017. Originallyapproved in 2011. Last previous edition approved in 2014 as C1756-14. DOI:10.1520/C1756-17.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.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 Copyright by ASTM Int'l (all rights reserved); Sat Sep 30 22:24:31 EDT 2017Downloaded/printed byUniversity of Edinburgh (University of Edinburgh) pursuant to License Agreement. No further reproductions authorized.
