ASTM_D_4141_-_D_4141M_-_14.pdf

Designation:D4141/D4141M14Standard Practice forConducting Black Box and Solar Concentrating Exposuresof Coatings1This standard is issued under the fixed designation D4141/D4141M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers two accelerated outdoor exposureprocedures for evaluating the exterior weather resistance ofcoatings applied to substrates.1.2 The two procedures are as follows:1.2.1 Procedure ABlack Box Exposure.1.2.2 Procedure CFresnel Reflector Rack Exposure.NOTE1Procedure B described a Heated Black Box procedure that isno longer in common use.1.3 This standard does not cover all the procedures that areavailable to the user for accelerating the outdoor exposure ofcoatings.Other procedures have been used in order to providea particular effect;however,the two procedures described hereare widely used.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately 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.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD660 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 PaintsD714 Test Method for Evaluating Degree of Blistering ofPaintsD772 Test Method for Evaluating Degree of Flaking(Scal-ing)of Exterior PaintsD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD4214 Test Methods for Evaluating the Degree of Chalkingof Exterior Paint FilmsD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous MetalsG7 Practice for Atmospheric Environmental Exposure Test-ing of Nonmetallic MaterialsG90 Practice for Performing Accelerated Outdoor Weather-ing of Nonmetallic Materials Using Concentrated NaturalSunlightG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testingof Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG169 Guide for Application of Basic Statistical Methods toWeathering Tests3.Terminology3.1 The definitions given in Terminology G113 are appli-cable to this practice.4.Summary of Practice4.1 Several procedures are described that provide accelera-tion of the degradation that coatings evidence during naturalweathering when exposed on an open rack at a fixed angle.Theprocedures appear in the following order: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 Feb.1,2014.Published February 2014.Originallyapproved in 1982.Last previous edition approved in 2007 as D4141 07.DOI:10.1520/D4141/D4141M-14.2For 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 States1 4.1.1 Procedure AExposure on a black box rack facing theequator at 5 from the horizontal.4.1.2 Procedure CExposure on a Fresnel reflector rackthat provides a high irradiance by following the sun andconcentrating sunlight on the test specimens by means ofmirrors.The specimens are wet periodically by high puritywater spray.4.2 The selection of Procedure A or C is dependent onseveral factors.4.2.1 Procedure A is designed to simulate the weatheringthat occurs on horizontal insulated surfaces.Specimens aretypically flat-coated metal panels measuring 10 by 30 cm 4 by12 in.or 15 by 30 cm 6 by 12 in.NOTE2Procedure A is specified in standards used by the automotiveindustry.4.2.2 Procedure C is designed to simulate weathering onboth aut