ASTM_D_6904_-_03_2022.pdf

Designation:D690403(Reapproved 2022)Standard Practice forResistance to Wind-Driven Rain for Exterior CoatingsApplied on Masonry1This standard is issued under the fixed designation D6904;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 is for the evaluation of the ability ofcoatings to resist the passage of water through masonry blockwhen exposed to water spray and air pressure.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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.1.4 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:2D1475 Test Method for Density of Liquid Coatings,Inks,and Related ProductsD3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD3925 Practice for Sampling Liquid Paints and RelatedPigmented Coatings2.2 Federal Standard:3TT-C-555B Coating,Textured(For Interior and ExteriorMasonry Surfaces)3.Summary of Practice3.1 Typically 8 by 16 by 2 in.masonry blocks are coatedwith block filler and then coated with the masonry paint andallowed to cure.The coated blocks are then secured to a testapparatus and exposed for 24 h to continuous water spray andair pressure or as agreed upon between manufacturer andsupplier.Upon completion of the exposure,the blocks areremoved,evaluated for visible water leaks or weight gain,orboth.4.Significance and Use4.1 This practice is meant to simulate the ability of a coatingsystem applied to a masonry block to withstand exposure tocontinuous water spray(rain)and a dynamic pressure equiva-lent to a 98 mph wind velocity without exhibiting water leaksor weight gain,or both.5.Apparatus5.1 The testing box is assembled from transparent plasticpanels12-in.thick and typically of the dimensions as shown inFig.1.Three openings on the side,6 by 12 in.,are provided sothat the coated side of the three blocks may be positioned fortest.The openings on the top of the apparatus for the air inletand manometer connection shall not be less than 3 in.apart tomake certain that air inlet turbulence will not effect themanometer readings.A spray tube shall be constructed from12-in.plastic tubing with three fish-tail nozzles.4Attachment tothe testing box includes a water-filled U-tube manometer,source of compressed air,clamps and angle irons for securelyfastening the test panels to the box,and a drain outlet.Also,1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.47 on Concrete,Stone and Masonry Treatments.Current edition approved Jan.1,2022.Published January 2022.Originallyapproved in 2003.Last previous edition approved in 2013 as D6904 03(2013).DOI:10.1520/D6904-03R22.2For 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.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.4Federal Specification TT-C-555B,Amendment No.1,dated August 5,1975,U.S.Government Printing Office.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.1illustrated is a simple air pressure regulator consisting of aT-tube with the leg(foot)of the tube placed in a water filledbeaker at a depth of slightly greater than 5 in.This set up is alsoa safety device.Any sudden increase in air pressure will bevented harmlessly.The apparatus outlined above was derivedfrom that shown in Federal Specification TT-C-555B.Appara-tus and substrates of