ASTM_D_6886_-_18.pdf

Designation:D688618Standard Test Method forDetermination of the Weight Percent Individual VolatileOrganic Compounds in Waterborne Air-Dry Coatings by GasChromatography1This standard is issued under the fixed designation D6886;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 is for the determination of the weightpercent of individual volatile organic compounds in water-borne air-dry coatings(Note 1).1.2 This method may be used for the analysis of coatingscontaining silanes,siloxanes,and silane-siloxane blends.1.3 This method is not suitable for the analysis of coatingsthat cure by chemical reaction(this includes two-componentcoatings and coatings which cure when heated)because thedilution herein required will impede the chemical reactionrequired for these types of coatings.1.4 Precision statistics for this method have been deter-mined for waterborne coatings in which the volatile organiccompound weight percent is below 5 percent.The method hasbeen used successfully with higher organic content waterbornecoatings and with solventborne coatings(Note 2).1.5 This method may also be used to measure the exemptvolatile organic compound content(for example,acetone,methyl acetate,t-butyl acetate and p-chlorobenzotrifluoride)ofwaterborne and solvent-borne coatings.Check local regula-tions for a list of exempt compounds.The methodology isvirtually identical to that used in Test Method D6133 which,aswritten,is specific for only exempt volatile compounds.1.6 Volatile compounds that are present at the 0.005 weightpercent level(50 ppm)or greater can be determined.Aprocedure for doing so is given in Section 9.1.7 Volatile organic compound content of a coating can becalculated using data from Test Method D6886 but requiresother data(see Appendix X2.)NOTE1Data from this method will not always provide the volatileorganic compound content of a paint film equivalent to EPA Method 24.Some compounds and some semi-volatile compounds may be consideredvolatile using the GC conditions specified but will not fully volatilizeduring the one hour at 110C conditions of EPA Method 24.Some or allof these materials remain in the paint film and therefore are not consideredvolatile organic compounds according to EPA Method 24.In addition,some compounds may decompose at the high inlet temperature of the GC.However,note the EPAMethod 24 has poor precision and accuracy at lowlevels of volatile organic compounds.NOTE2This method measures volatile organic compound weight ofair-dry coatings directly as opposed to other methods in Practice D3960which measure the volatile organic compound weight percent indirectly.Adirect measurement of the weight percent particularly in low volatileorganic compound content waterborne coatings,generally gives betterprecision.California Polytechnic State University carried out an extensivestudy for the California Air Resources Board comparing the precision ofthe direct method with the indirect method(CARB Standard AgreementNo.04.329)Detailed results of this study may be found at http:/www.arb.ca.gov/coatings/arch/Final_Report_6_11_09.pdf.This studymay be used to decide if the present method or other methods in PracticeD3960 are preferred for a specific coating.1.8 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.9 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.1.10 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:2D1475 Test Method for Density of Liquid Coatings,Inks,and Related ProductsD2369 Test Method for Volatile Content of Coatings1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved Oct.1,2018.Published October 2018.Originallyapproved in 2003.Last previous edition approved in 2014 as D6886 141.DOI:10.1520/D6886-18.2For 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 webs