ASTM_D_5402_-_15.pdf

Designation:D540215Standard Practice forAssessing the Solvent Resistance of Organic CoatingsUsing Solvent Rubs1This standard is issued under the fixed designation D5402;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 a solvent rub technique forassessing the solvent resistance of an organic coating thatchemically changes during the curing process.This techniquecan be used in the laboratory,in the field,or in the fabricatingshop.Test Method D4752 is the preferred method for ethylsilicate zinc-rich primers.1.2 This practice does not specify the solvent,number ofdouble rubs,or expected test results.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 and health practices and determine the applica-bility of regulatory limitations prior to use.Consult thesuppliers Safety Data Sheet for specific hazard informationrelating to the solvent used.2.Referenced Documents2.1 ASTM Standards:2D235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D523 Test Method for Specular GlossD740 Specification for Methyl Ethyl KetoneD843 Specification for Nitration Grade XyleneD3363 Test Method for Film Hardness by Pencil TestD4138 Practices for Measurement of Dry Film Thickness ofProtective Coating Systems by Destructive,Cross-Sectioning MeansD4752 Practice for Measuring MEK Resistance of EthylSilicate(Inorganic)Zinc-Rich Primers by Solvent RubD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous Metals3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 double rub,nthe act of rubbing a cloth in onecomplete forward and back motion over a coated surface.4.Significance and Use4.1 Coatings that chemically change during the curingprocess,such as epoxies,vinyl esters,polyesters,alkyds andurethanes,become more resistant to solvents as they cure.These coatings should reach specific levels of solvent resis-tance prior to being topcoated and prior to placing in service;the levels of solvent resistance necessary vary with the type ofcoating and the intended service.Rubbing with a cloth satu-rated with the appropriate solvent is one way to determinewhen a specific level of solvent resistance is reached.However,the level of solvent resistance by itself does not indicate fullcure and some coatings become solvent resistant before theybecome sufficiently cured for service.4.2 The time required to reach a specific level of solventresistance can be influenced by temperature,film thickness,airmovement and,for water-borne or water-reactive coatings,humidity.4.3 The test solvents effect upon the coating varies withcoating type and solvent used.The coating manufacturer mayspecify the solvent,the number of double rubs,and the specifictest results needed.5.Materials and Equipment5.1 Solvent:5.1.1 Methyl Ethyl Ketone(MEK),conforming to Specifi-cation D740,or5.1.2 Mineral Spirits,conforming to Specification D235,or5.1.3 Xylene,conforming to Specification D843,or5.1.4 Other Solvents,as specified by the coating manufac-turer or user.1This 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 June 1,2015.Published June 2015.Originallyapproved in 1993.Last previous edition approved in 2011 as D5402 06(2011).DOI:10.1520/D5402-15.2For 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 States1 5.2 100%Cotton,Shop Cloth or Cheesecloth.Cheeseclothis for coil coatings,mesh grade 28 by 24.Approximately 300by 300 mm(12 by 12 in.)and contrasting in color to thecoating being evaluated,or other mutually agreed upon cloth.5.3 Proper Safety Equipment,as determined from the sol-vent MSDS,for example,solvent resistant gloves,respirator.6.ProcedureMethod A(Standard Method)6.1 If the testing is being performed in a laboratory setting,before actually testing the specimens,perform a sufficientnumber of double rubs with the index finger covered with acotton cloth on a laboratory balance such that 1000 to 2000 gof force is constantly