ASTM_C_542_-_05_2017.pdf

Designation:C54205(Reapproved 2017)Standard Specification forLock-Strip Gaskets1This standard is issued under the fixed designation C542;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 specification defines the required properties oflock-strip gaskets where resistance to sunlight,weathering,flame,oxidation,permanent deformation under load,anddiminution of gripping pressure are prime essentials.NOTE1The requirement of flame propagation may be waived by thearchitect or professional engineer when doing so does not conflict withlocal codes or ordinances.1.2 This specification applies only to the“locking”com-pression type of gasket,sometimes referred to as the“zipper”type.NOTE2Structural integrity and weather-tightness of the wall requiresthe sound design and installation of the entire system of which the gasketis only one component.1.3 The values stated in SI units are to be regarded as thestandard.1.4 Test Method C1166,as referenced in this specification,should be used to measure and describe the properties ofmaterials,products,or assemblies in response to heat andflame under controlled laboratory conditions and should not beused to describe or appraise the fire hazard or fire risk ofmaterials,products,or assemblies under actual fire conditions.However,results of this test may be used as elements of a firerisk assessment which takes into account all of the factorswhich are pertinent to an assessment of the fire hazard of aparticular end use.1.5 The following precautionary caveat pertains only to thetest method portion,Section 7,of this specification:Thisstandard does not purport to address the safety concerns,ifany,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.1.6 The committee with jurisdiction over this standard is notaware of any comparable standards published by other orga-nizations.1.7 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:2C1166 Test Method for Flame Propagation of Dense andCellular Elastomeric Gaskets and AccessoriesD15 Method of Compound and Sample Preparation forPhysical Testing of Rubber Products(Withdrawn 1975)3D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD573 Test Method for RubberDeterioration in an AirOvenD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD746 Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD2240 Test Method for Rubber PropertyDurometer Hard-ness2.2 Other Standard:Rubber Handbook,Specifications for Rubber Products43.Materials and Manufacture3.1 All materials and workmanship shall be in accordancewith good commercial practice.3.2 Gaskets shall be manufactured from an ozone-resistantcompound and shall not be dependent for ozone resistance on1This specification is under the jurisdiction of ASTM Committee C24 onBuilding Seals and Sealants and is the direct responsibility of Subcommittee C24.73on Compression Seal and Lock Strip Gaskets.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 1965.Last previous edition approved in 2011 as C542 05(2011).DOI:10.1520/C0542-05R17.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Rubber Manufacturers Association,444 Madison Ave.,NewYork,NY.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 surface protection which can be removed by abrasion,detergents,or other means.3.3 Gaskets shall be free of porosity,surface defects,anddimensional