ASTM_D_1735_-_14.pdf

Designation:D173514Standard Practice forTesting Water Resistance of Coatings Using Water FogApparatus1This standard is issued under the fixed designation D1735;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This practice covers the basic principles and operatingprocedures for testing water resistance of coatings in anapparatus similar to that used for salt spray testing.1.2 This practice is limited to the methods of obtaining,measuring,and controlling the conditions and procedures ofwater fog tests.It does not specify specimen preparation,specific test conditions,or evaluation of results.NOTE1Alternative practices for testing the water resistance ofcoatings include Practices D870,D2247,and D4585.1.3 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 whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusD609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating ProductsD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD714 Test Method for Evaluating Degree of Blistering ofPaintsD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD870 Practice for Testing Water Resistance of CoatingsUsing Water ImmersionD1193 Specification for Reagent WaterD1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive EnvironmentsD1730 PracticesforPreparationof AluminumandAluminum-Alloy Surfaces for PaintingD2247 Practice for Testing Water Resistance of Coatings in100%Relative HumidityD2616 Test Method for Evaluation of Visual Color Differ-ence With a Gray ScaleD3359 Test Methods for Measuring Adhesion by Tape TestD3363 Test Method for Film Hardness by Pencil TestD4541 Test Method for Pull-Off Strength of Coatings UsingPortable Adhesion TestersD4585 Practice for Testing Water Resistance of CoatingsUsing Controlled Condensation3.Summary of Practice3.1 Coated specimens are placed in an enclosed chamber topermit free settling of fog on all specimens.The temperature ofthe chamber is usually maintained at 38C(100F).Theexposure condition is varied by selecting the duration of thetest.Water permeates the coating at rates that are dependentupon the characteristics of the coating.Any effects such ascolor change,blisters,loss of adhesion,softening,or embrittle-ment are observed and reported.4.Significance and Use4.1 Water can cause the degradation of coatings,so knowl-edge of how a coating resists water is helpful in predicting itsservice life.Failure in water fog tests may be caused by anumber of factors,including a deficiency in the coating itself,contamination of the substrate,or inadequate surface prepara-tion.The test is therefore useful for evaluating coatings aloneor complete coating systems.4.2 Water fog tests are used for research and development ofcoatings and substrate treatments,specification acceptance,andquality control in manufacturing.These tests usually result in apass or fail determination,but the degree of failure may also be1This 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 June 15,2014.Published July 2014.Originallyapproved in 1960.Last previous edition approved in 2008 as D1735 08.DOI:10.1520/D1735-14.2For 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 measured.A coating system is considered to pass if there is noevidence of water-related failure after a specified period oftime.4.3 Results obtained from the use of water fog tests inaccordance with this practice should not be represented asbeing equivalent to a period of exposure to water in the naturalenvironment,until the degree of quantitative correlation hasbeen established for the coating or coating system.4.4 The test apparatus is similar to that used