1、Designation:D572214Standard 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 indica
2、tes 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 weath
3、eringeffects 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 as
4、sessment 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
5、 as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard does not purport to address all of thesafety concerns,if any,a
6、ssociated 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:2D660 Test Method for Evaluating Degree of Checking ofExt
7、erior 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 Fi
8、lmsG90 Practice for Performing Accelerated Outdoor Weather-ing of Nonmetallic Materials Using Concentrated NaturalSunlightG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG169 Guide for Application of Basic Statistical Methods toWeathering Tests3.Terminol
9、ogy3.1 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 g
10、reater 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.3.2.2.1 DiscussionWood-like and stucco patterns are ex-amples of typical embossed hardboard surfaces.4.Summary of P
11、ractice4.1 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
12、,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-applied1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coating
13、s,Materials,and Applications and is the direct responsibility ofSubcommittee D01.27 on Accelerated Testing.Current edition approved Dec.1,2014.Published January 2015.Originallyapproved in 1995.Last previous edition approved in 2008 as D5722 08.DOI:10.1520/D5722-14.2For referenced ASTM standards,visi
14、t 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 Bar
15、r Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 coatings is of paramount importance in making sound businessand technical decisions.5.2 It is important to include control specimens of knownfield performance to determine the efficacy of this practice forspecific substrate(s)
16、and coating system(s).These controlspecimens may include materials known to possess acceptableand unacceptable field performance for the defect(s)underconsideration.5.3 Results derived from this practice are best used tocompare the relative performance of materials tested at thesame time in the same device.5.4 The inclusion of control specimens and their resultingdata will assist in dealing with test variability caused byseasonal or annual variations in important climatic factors.5.5 Extensive r