ASTM_D_5722_-_20.pdf

Designation:D572220Standard Practice forPerforming Accelerated Outdoor Weathering of Factory-Coated Embossed Hardboard Using Concentrated NaturalSunlight and a Soak-Freeze-Thaw Procedure1This standard is issued under the fixed designation D5722;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 covers techniques to accelerate weatheringeffects of factory-coated embossed hardboard using Cycle 1 ofPractice G90(concentrated natural sunlight with periodicsurface water spray)plus a soak-freeze thaw cycle(see Section5 of this practice).1.2 Testing by use of the methods described in this practicemay be employed in the qualitative assessment of weatheringeffects.The relative durability of coated hardboards may bebest determined by comparison of their test results with thoseof control specimens derived from real time exposure testexperience.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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:2D660 Test Method for Evaluating Degree of Checking ofExterior PaintsD661 Test Method for Evaluating Degree of Cracking ofExterior PaintsD662 Test Method for Evaluating Degree of Erosion ofExterior PaintsD772 Test Method for Evaluating Degree of Flaking(Scal-ing)of Exterior PaintsD4214 Test Methods for Evaluating the Degree of Chalkingof Exterior Paint FilmsG90 Practice for Performing Accelerated Outdoor Weather-ing of Materials Using Concentrated Natural SunlightG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG169 Guide for Application of Basic Statistical Methods toWeathering Tests3.Terminology3.1 The terminology used in this practice is defined inTerminology G113.3.2 Definitions:3.2.1 hardboard,ngeneric term for a panel manufacturedprimarily from inter-felted lignocellulosic fibers(usuallywood),consolidated under heat and pressure in a hot press toa density of 500 kg/m3(31 lb/ft3)or greater and to which othermaterials may have been added during manufacture to improvecertain properties.3.2.2 embossed hardboard,nhardboard that is manufac-tured with a textured surface.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.27 on Accelerated Testing.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1995.Last previous edition approved in 2014 as D5722 14.DOI:10.1520/D5722-20.2For 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.*A Summary of Changes section appears at the end of this standardCopyright 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.3.2.2.1 DiscussionWood-like and stucco patterns are ex-amples of typical embossed hardboard surfaces.4.Summary of Practice4.1 This practice is used to accelerate long-term weatheringeffects by subjecting the samples to concentrated naturalsunlight(with periodic daytime surface water spray)plus asoak-freeze-thaw cycle.4.2 This practice has been useful in accelerating finishfailure involving loss of film integrity,such as cracking,peeling,and flaking of factory-coated embossed hardboard.5.Significance and Use5.1 The ability to quickly and accurately evaluate andpredict long-term weathering performance of factory-appliedcoatings is of paramount importance in making sound businessand technical de