ASTM_C_1392_-_00_2014.pdf

Designation:C139200(Reapproved 2014)Standard Guide forEvaluating Failure of Structural Sealant Glazing1This standard is issued under the fixed designation C1392;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 covers a screening approach to detect failure(adhesive or cohesive)of a structural sealant in a structuralsealant-glazed window,curtain wall,or other similar system.Presently,onlyasilicone-sealantthatisspecificallyformulated,tested,and marketed as a structural glazing sealantis allowed for structural sealant glazing.1.2 The values stated in either acceptable metric units or inother units shall be regarded separately as the standard.Thevalues stated in each system may not be exact equivalents;therefore,each system must be used independently of the other,without combining values in any way.1.3 There are no ISO standards similar or equivalent to thisASTM standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and Sealants3.Terminology3.1 Definitions:Refer to Terminology C717 for the follow-ing definitions and description of terms used in this guide:adhesive failure;cohesive failure;deflection;glazing;joint;lite;modulus;silicone sealant;structural sealant;structuralsealant glazing;and substrate.3.1.1 qualified authority,na person with a recognizeddegree or professional certificate and extensive knowledge andexperience in the particular fields necessary for the evaluationprogram.The authoritys qualification level that is necessary tospecify the evaluation criteria and interpret the significance ofthe results depends upon the level of sophistication of theevaluation program.For example,if statistical and finiteelement analyses are being incorporated into the evaluationprogram,then the authority should be knowledgeable andexperienced in these areas.3.1.2 competent person,na person experienced in theoperation of the testing equipment and with an understandingof the construction of the wall system.This person may carryout the field testing under the supervision of the qualifiedauthority.4.Summary of Guide4.1 This guide uses deflection measurements obtained fromlocalized applied loads to determine locations of sealant failurein an installed structural sealant glazing system.4.2 Initially,the deflection of an existing lite that is fullyadhered by a structural sealant is measured when a discreteedge of the lite is loaded laterally.Subsequently,at a fewselected lites,the structural sealant is cut intentionally tosimulate failure,and the deflection of the lite is measured at thesame lateral load.This provides the basis for determiningduring subsequent tests of other lites in the system whether thesealant has failed.4.3 Additional lites are evaluated and their deflectionsmeasured to determine the extent of any structural sealantfailure.Structural sealant failure is determined by comparingthe measured deflections with the initial measurements ofdeflection with and without failed(intentionally cut)sealant.5.Significance and Use5.1 This guide suggests a simple means of evaluating theextent of any failure of a structural sealant in an installedstructural sealant glazing system.5.2 A qualified authority should specify the criteria de-scribed in Sections 8 and 9 and should interpret the results andjudge their significance for the structural sealant glazingsystem.5.3 The evaluation program measures deflection of loadedlites and does not measure directly any structural sealantfailure.Consequently,the qualified authority interpreting thedata should also evaluate the source of any increased deflection1This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.10 onSpecifications,Guides and Practices.Current edition approved Jan.1,2014.Published December 2009.Originallyapproved in 1998.Last previous edition approved in 2009 as C1392 00(2009).DOI:10.1520/C1392-00R14.2For 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 that is measured.Increased deflection may be due to structuralsealant adhesive or cohesive failure,but may also be due to adecrease in sealant modulus,a change in sealant jointdime