ASTM_C_1850_-_17.pdf

Designation:C185017Standard Guide forImproved Laboratory Accelerated Tests to Predict theWeathering and for Use in Developing Protocols to Predictthe Design Life of Building Sealant Systems1This standard is issued under the fixed designation C1850;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 describes the steps for developing improvedlaboratory accelerated weathering tests for predicting thenatural weathering effects on building sealant systems and forusing those tests in development of methods for design lifeprediction of the systems.1.2 This guide outlines a systematic approach to develop-ment of laboratory accelerated weathering tests of buildingsealant systems including the identification of neededinformation,the development of accelerated tests,the applica-tion of data,and the reporting of results.1.3 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 SealantsG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic Materials3.Terminology3.1 DefinitionsFor definitions of terms used in this guide,refer to Terminologies C717 and G113.3.2 Definitions of Terms Specific to This Standard:3.2.1 biological degradation factordegradation factors di-rectlyassociatedwithlivingorganisms,includingmicroorganisms,fungi,and bacteria.3.2.2 building sealant system componenta part of a build-ing sealant system that may include a combination of buildingmaterials,such as cladding,substrates or the sealant.3.2.3 building sealant system materiala material that maybe used in a building sealant system.3.2.4 critical performance characteristic(s)a property,orgroup of properties,of a building sealant system that must bemaintained above a certain minimum level.3.2.5 degradation mechanismthe chemical reactions in-duced in a building component or material by one or moredegradation factors resulting in changes in one or more of thecritical performance characteristics.3.2.6 incompatibility factorany of the group of degrada-tion factors that result from detrimental chemical and physicalinteractions between building components or materials.3.2.7 in-service testa test in which building componentsor materials are exposed to degradation factors under in-serviceconditions.3.2.8 performance criteriona quantitative statement of alevel of properties for a selected characteristic of a componentor material needed to ensure compliance with a functionalrequirement.3.2.9 property measurement testa test for measuring oneor more properties of building components or materials.3.2.10 load stress factorany degradation factors that resultfrom externally applied sustained or periodic mechanical loads.3.2.11 use factorany factor that affects the material as aresult of the design of the system,installation and maintenanceprocedures,normal wear and tear,and user abuse.(Example:abrasion of foot traffic.)3.2.12 weathering factorsany degradation factors associ-ated with the natural environment,including radiation,temperature,rain and other forms of water,freezing andthawing.4.Significance and Use4.1 This guide is intended to serve as a reference ofrecommended methodology for users developing relevant,reliable and valid tests for predicting natural weathering effects1This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.20 on GeneralTest Methods.Current edition approved March 15,2017.Published April 2017.DOI:10.1520/C1850-17.2For 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 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 and for use in developing methods to determine design life ofbuilding sealant systems through the use of accelerated testprotocols.The proposed standard corrects for some of thedeficiencies of existing laboratory accelerated tests of sealants.4.2 The development of accelerated wea