ASTM_C_920_-_14a.pdf

Designation:C92014aStandard Specification forElastomeric Joint Sealants1This standard is issued under the fixed designation C920;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This ASTM specification covers the properties of acured single-or multicomponent cold-applied elastomeric jointsealant for sealing,caulking,or glazing operations onbuildings,plazas,and decks for vehicular or pedestrian use,and types of construction other than highway and airfieldpavements and bridges.1.2 A sealant meeting the requirements of this specificationshall be designated by the manufacturer to be one or more ofthe types,classes,grades,and uses defined in Section 7.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard is similar,but not identical,to ISO 11600.2.Referenced Documents2.1 ASTM Standards:2C510 Test Method for Staining and Color Change of Single-or Multicomponent Joint SealantsC639 Test Method for Rheological(Flow)Properties ofElastomeric SealantsC661 Test Method for Indentation Hardness of Elastomeric-Type Sealants by Means of a DurometerC679 Test Method for Tack-Free Time of Elastomeric Seal-antsC717 Terminology of Building Seals and SealantsC719 Test Method for Adhesion and Cohesion of Elasto-meric Joint Sealants Under Cyclic Movement(HockmanCycle)C793 Test Method for Effects of Laboratory AcceleratedWeathering on Elastomeric Joint SealantsC794 Test Method forAdhesion-in-Peel of Elastomeric JointSealantsC1183 Test Method for Extrusion Rate of Elastomeric Seal-antsC1193 Guide for Use of Joint SealantsC1246 Test Method for Effects of Heat Aging on WeightLoss,Cracking,and Chalking of Elastomeric SealantsAfter CureC1247 Test Method for Durability of Sealants Exposed toContinuous Immersion in LiquidsC1442 Practice for Conducting Tests on Sealants UsingArtificial Weathering Apparatus3.Terminology3.1 DefinitionsRefer to Terminology C717 for definitionsof the following terms used in this specification:adhesivefailure,caulking,chemically curing sealant,cohesive failure,cure,cured,elastomeric,glazing,joint,primer,seal,sealant,and standard conditions.4.Classification of Sealants4.1 A sealant qualifying under this specification shall beclassified as to type,grade,class,and use as follows:4.1.1 Type SA single-component sealant.4.1.2 Type MA multicomponent sealant.4.1.3 Grade PA pourable or selfleveling sealant that hassufficient flow to form a smooth,level surface when applied ina horizontal joint at 4.4C(40F).4.1.4 Grade NSA nonsag or gunnable sealant that permitsapplication in joints on vertical surfaces without sagging orslumping when applied at temperatures between 4.4 and 50C(40 and 122F).4.1.5 Class 100/50Asealant that when tested for adhesionand cohesion under cyclic movement(8.8)shall withstand anincrease of at least 100%and a decrease of at least 50%of thejoint width as measured at the time of application,and,inaddition,meet all the requirements of this specification.4.1.6 Class 50Asealant that when tested for adhesion andcohesion under cyclic movement(8.8)shall withstand anincrease and decrease of at least 50%of the joint width asmeasured at the time of application,and,in addition,meet allthe requirements of this specification.1This specification is under the jurisdiction of ASTM Committee C24 onBuilding Seals and Sealants and is the direct responsibility of Subcommittee C24.10on Specifications,Guides and Practices.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1979.Last previous edition approved in 2014 as C920 14.DOI:10.1520/C0920-14A.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 4.1.7 Class 35Asealant that when tested for adhesion andcohesion under cyclic movement(8.8)shall withstand anincrease and decrease of at least 35%of the joint width asmeasured at the time of application,and,in addition,meet allthe requirements of this specification.4.1.8 Class 25Asealant that when tested for adhesion andcohesion under cyclic movement(8.8)shall withstand anincrease and decrease of at least 25%of the joint width asmeasured at the time of application,and,in addition,meet allthe requirements of this specification.4.1.9 Class 1212A sealant that when tested for adhesionand cohesion under cyclic movement(8.8)shall withstand anincrease and decrease of at least 1212%of the joint width a