ASTM_D_5043_-_04_2009.pdf

Designation:D504304(Reapproved 2009)Standard Practice forField Identification of Coatings1This standard is issued under the fixed designation D5043;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 describes procedures and portable appara-tus for determining the generic type of coating films mostlikely to be encountered on structures.The coating can eitherbe weathered from exposure or be freshly applied.1.2 Most commonly used coatings can be divided into thebroad categories and subgroups shown in Table 1 on the basisof the nonvolatile component(generic types)of their vehicle(film forming resin,binder).Although the curing of somecoatings involves more than one process and coatings maycontain more than one type of resin,they can usually beassigned to one of the basic classes and generic types listed inTable 1.1.3 For field exposed coatings,it is suggested that these testmethods be used as part of a complete evaluation of a coatedsurface as it is frequently helpful to consider the environmentof exposure and how the coating has performed in theenvironment when drawing conclusions from these tests.1.4 These procedures will not result in the identification ofcomponents of a coating beyond general classification of thecoating by generic type and are not appropriate if more detailedanalysis is required,for example,as a part of failure analysis orto identify between different manufacturers of the same type ofcoating.They also may not be definitive enough to identifycomplex systems that include multiple layers of differentgeneric types of coatings.1.5 The evaluation of results is quite subjective.Practiceand experience are required to minimize misinterpretation.Repeat tests may be required.1.6 None of the test is to be taken alone as grounds foridentifying the generic type.Only the combination of resultsfrom several or all of the tests is to be used in conclusionsregarding generic types.1.7 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for in formationonly.1.8 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.For specific hazardstatements see 5.3.4,6.3.1,6.3.3,7.4,and 8.4.2.Summary of Practice2.1 Samples of coatings films are tested with solvents andchemicals and subjected to pyrolysis to provide evidence oftheir generic type.Fig.1 shows a flow chart for suggested orderof tests and classification of results.3.Significance and Use3.1 Information about the generic type of coating on asurface is required to select compatible coatings for repaintingand can be used when evaluating the performance of a coatingin an environment in decisions on upgrading or replacing acoating system.This guide provides a systematic procedure foridentifying the generic type of a coating.The procedure can beperformed in the field by personnel with limited laboratoryexperience,and requires a minimum of equipment and mate-rials.4.Sampling4.1 The sample of coating is obtained by chipping orscraping with a knife or by sanding and then brushing thematerial into a specimen container or clean envelope.Careshould be taken not to cut into substrates,such as plastic orasphalt,that contain polymeric or bituminous materials.Smallportions of untreated wood,masonry,or steel do not ordinarilyinterfere with the tests.Some tests can be conducted directly onthe coating surface.If a liquid sample of coating is to beevaluated,a film of the coating should first be cast on a glassplate or similar surface from which it can conveniently beremoved after drying.NOTE1To develop familiarity with the subjective evaluations thatfollow,it is good practice to make films of known resin composition byapplying control paints to glass plates or similar surfaces from which theycan be readily removed after drying.5.Pyrolysis5.1 Summary of Test ProcedureA sample of coatingplaced in a small glass test tube is burned over a hot flame.The1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Dec.1,2009.Published December 2009.Originallyapproved in 1990.Last previous edition approved in 2004 as D5043 04.DOI:10.1520/D5043-04R09.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 way the coating burns,its odor,and other characteristics of thefume generated are recorded.The Beilstein test identifies thepresence of chl