ASTM_D_5590_-_17_2021.pdf

Designation:D559017(Reapproved 2021)Standard Test Method forDetermining the Resistance of Paint Films and RelatedCoatings to Fungal Defacement by Accelerated Four-WeekAgar Plate Assay1This standard is issued under the fixed designation D5590;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 test method covers an accelerated method fordetermining the relative resistance of two or more paints orcoating films to fungal growth.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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:2D1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD3273 Test Method for Resistance to Growth of Mold on theSurface of Interior Coatings in an Environmental Cham-berD3456 Practice for Determining by Exterior Exposure Teststhe Susceptibility of Paint Films to MicrobiologicalAttackD4587 Practice for Fluorescent UV-Condensation Expo-sures of Paint and Related CoatingsD4708 Practice for Preparation of Uniform Free Films ofOrganic CoatingsD6132 Test Method for Nondestructive Measurement of DryFilm Thickness of Applied Organic Coatings Using anUltrasonic Coating Thickness GageD6695 Practice for Xenon-Arc Exposures of Paint andRelated CoatingsG21 Practice for Determining Resistance of Synthetic Poly-meric Materials to Fungi3.Summary of Test Method3.1 This test method outlines a procedure to(1)prepare asuitable specimen for testing,(2)inoculate the specimen withthe proper fungal species,(3)expose the inoculated samplesunder the appropriate conditions for growth,and(4)provide aschedule and guidelines for visual growth ratings.This testmethod is not designed to include all the necessary proceduresto maintain the proper microbiological techniques required toprovide the most accurate results.4.Significance and Use4.1 Defacement of paint and coating films by fungal growth(mold,mildew)is a common phenomenon,and defacement byalgal growth can also occur under certain conditions.It isgenerally known that differences in the environment,lighting,temperature,humidity,substrate pH,and other factors inaddition to the coating composition affect the susceptibility ofa given painted surface.This test method attempts to provide ameans to comparatively evaluate different coating formulationsfor their relative performance under a given set of conditions.It does not imply that a coating that resists growth under theseconditions will necessarily resist growth in the actual applica-tion.The method is not intended to simulate or replace indooror outdoor exposure of paint films or related coatings.NOTE1It is hoped that a ranking of relative performance would besimilar to that ranked from outdoor exposures.Paint designated for servicein exterior conditions should be pre-conditioned by laboratory acceleratedweathering prior to exposure to fungi.All pre-conditioning must bedetailed in the final report.This test method however,should not be usedas a replacement for exterior exposure(that is,Practice D3456)sincemany other factors,only a few of which are listed will affect those results.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.28 on Biodeterioration.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 1994.Last previous edition approved in 2017 as D5590 17.DOI:10.1520/D5590-17R21.2For 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 T