ASTM_C_1521_-_13.pdf

Designation:C152113Standard Practice forEvaluating Adhesion of Installed Weatherproofing SealantJoints1This standard is issued under the fixed designation C1521;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 practice describes destructive and nondestructiveprocedures.1.2 The destructive procedure stresses the sealant in such away as to cause either cohesive or adhesive failure of thesealant or cohesive failure of the substrate where deficientsubstrate conditions exist.The objective is to characterize theadhesive/cohesive performance of the sealant on the specificsubstrate by applying whatever strain is necessary to effectfailure of the sealant bead.It is possible that the strain appliedto the sealant bead may result in the failure of a deficientsubstrate before effecting a failure in the sealant.NOTE1The destructive procedure requires immediate repair of thesealant bead.Appropriate materials and equipment should be available forthis purpose.NOTE2Sealant formulations may fail in cohesion or adhesion whenproperly installed,and tested by this method.The sealant manufacturershould be consulted to determine the appropriate guidelines for using thismethod.1.3 The nondestructive procedure places strain on the seal-ant and a stress on the adhesive bond.Though termednondestructive,this procedure may result in an adhesive failureof a deficient sealant bead,but should not cause a cohesivefailure in the sealant.The results of this procedure should beeither adhesive failure or no failure.NOTE3The nondestructive procedure may require immediate repairof the sealant bead,if failure is experienced.Appropriate materials andequipment should be available for this purpose.1.4 The non-destructive procedure can be used for continu-ous inspection of 100%of the joint(s)or for any areas wheredeficient conditions,which are inconsistent with the practicesof Guide C1193,are suspected.1.5 The committee with jurisdiction over this practice is notaware of any comparable practices published by other organi-zations or committees.1.6 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.7 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 SealantsC794 Test Method forAdhesion-in-Peel of Elastomeric JointSealantsC1193 Guide for Use of Joint Sealants3.Terminology3.1 DefinitionsFor definitions of terms used in this rec-ommended procedure,see Terminology C717.3.2 Definitions of Terms Specific to This Standard:3.2.1 flap,nthe term“flap”as used in this specificationrefers to a portion of an installed sealant bead that has beenpurposely cut along one substrate bond line and across the beadat two locations resulting in a portion of bead adhered alongone substrate bond line.3.2.2 tail,nthe term“tail”as used in this specificationrefers to a portion of an installed sealant bead that has beenpurposely cut along both substrate bond lines and across thebead at one location resulting in a portion of bead unadhered tothe substrates but adhered to the remainder of the sealant bead.4.Significance and Use4.1 Many parameters contribute to the overall performanceof a sealant application.Some of the most significant param-eters are sealant bead size and configuration,joint movement,1This practice is under the jurisdiction of ASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.30 onAdhesion.Current edition approved May 1,2013.Published May 2013.Originallyapproved in 2002.Last previous edition approved in 2009 as C1521 091.DOI:10.1520/C1521-13.2For 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 quality of workmanship,the quality of the adhesive bond,andthe quality of the sealant material.4.2 Asealant usually fails to perform as a weatherseal whenit experiences cohesive or adhesive failure.4.3 If a sealant bead fails,an evaluation of the total jointmovement may be needed to determine if the joint sealant wasstrained beyond design or if the sealant failed within designparameters.4.4 If a sealant bead fails adhesively,t