ASTM_D_6990_-_20.pdf

Designation:D699020Standard Practice forEvaluating Biofouling Resistance and Physical Performanceof Marine Coating Systems1This standard is issued under the fixed designation D6990;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 establishes a practice for evaluating degreeof biofouling settlement on and physical performance ofmarine coating systems when panels coated with such coatingsystems are subjected to immersion conditions in a marineenvironment.Guidance for preparation or exposure and han-dling of test specimens can be found in related ASTMstandards as noted below(see Section 2).1.2 This practice and related exposure methodologies aredesigned as tools for the relative assessment of coatingperformance,and in no way are to be used as an absoluteindicator of long-term performance under all conditions and inall environments.There can be high variability among andwithin exposure sites with respect to water quality and popu-lation or species of fouling organisms,and coating perfor-mance may vary with these and other properties.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.Aspecific hazard statement is given in Section 6.1.5 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:2Recommended ASTM Methods and Practices for evaluationof antifouling coatings via panel exposure under a variety ofexposure conditions:D3623 Test Method for Testing Antifouling Panels in Shal-low SubmergenceD4938 Test Method for Erosion Testing of AntifoulingPaints Using High Velocity WaterD4939 Test Method for Subjecting MarineAntifouling Coat-ing to Biofouling and Fluid Shear Forces in NaturalSeawaterD5479 Practice for Testing Biofouling Resistance of MarineCoatings Partially ImmersedD5618 Test Method for Measurement of Barnacle AdhesionStrength in Shear(Withdrawn 2020)3G141 Guide for Addressing Variability in Exposure Testingof Nonmetallic Materials3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 biofilm,nmatrix-enclosed populations of microor-ganisms adherent to each other or to surfaces,or both,orinterfaces.3.1.2 biofouling adhesion,nqualitative or quantitativeforce required for the successful and complete removal ofmarine fouling attached to the antifouling coating surface(forexample,reference Test Method D5618 for barnacles).3.1.3 corrosion eruptions,nbuild up of oxides,exitingthrough protective paint film.3.1.4 damage,nlimited destruction of portions of paintfilm due to impact with a foreign article.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.45 on Marine Coatings.Current edition approved Sept.1,2020.Published September 2020.Originallyapproved in 2003.Last previous edition approved in 2011 as D6990 05(2011)which was withdrawn in January 2020 and reinstated in September 2020.DOI:10.1520/D6990-20.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.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.3.1.5 digging,na term used to describe hard foulingmacroorganisms that are growing“into”the coating.That is,where its calcareous shell penetrates/breaks through the coat-ing surface causing physical damage to the coating.3.1.6 macroorganism,norganisms large enough to be seenwith the naked eye and thus would be noted when growing onsubmerged surfaces.3.1.7 microorganism,norganisms too small to be seenwith the naked eye,which generally in