ASTM_D_5965_-_19.pdf

Designation:D596519Standard Test Methods forDensity of Coating Powders1This standard is issued under the fixed designation D5965;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 These standard test methods cover three procedures fordetermining the density of coating powders,as follows:1.2 Test Method A,for testing coating powders,excludingmetallics,is a method that uses readily available laboratoryequipment(for example,analytical balance,volumetric flask,etc.).1.3 Test Method B requires the use of a pycnometer.1.4 Test Method C is a method that calculates the density ofa powder based upon the formula ingredients and their amountsand densities.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 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.1.7 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:2D3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterials(Withdrawn 2016)3E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 coating powder,nfinely divided particles of resin,either thermoplastic or thermosetting,generally incorporatingpigments,fillers,and additives and remaining finely dividedduring storage under suitable conditions,which,after fusingand possibly curing,give a continuous film.3.1.2 density,nthe mass per unit volume of a material,usually expressed in g/cm3.3.1.2.1 DiscussionIn this standard,a volumetric flaskcapacity is expressedby conventionin mL.However,con-vention also states density in terms of mass per cm3.Since1 mL=1 cm3,terms will be interchangedby conventionbut will not affect any of the calculations.3.1.3 meniscus,ncurved upper surface of a liquid columnthat is concave when the containing walls are wetted by theliquid.3.1.4 powder coating,ncoatings which are protective ordecorative,or both,formed by the application of a coatingpowder to a substrate and fused into continuous films by theapplication of heat or radiant energy.3.1.5 pycnometer,ninstrument designed to measure thevolume of solid materials using Archimedes principle of fluiddisplacement.The displaced fluid is a helium gas.3.1.6 wetting liquid,nan organic solvent used to wet-outthe powder and displace the air that is trapped between thepowder particles.4.Significance and Use4.1 Test Method A is a straight-forward method usingreadily available laboratory equipment and glassware.TestMethod A may only be used with powder that does not containmetallic pigments.4.2 Test Method B provides better precision at higher costand includes metallics,although different models produceddifferent grand averages for each of the three samples tested.4.3 Test Method C may be used when the formulation isknown,and the density of each raw material is available.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.51 on Powder Coatings.Current edition approved July 1,2019.Published July 2019.Originally approvedin 1996.Last previous edition approved in 2013 as D5965 02(2013).DOI:10.1520/D5965-19.2For 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.1 5.Reagents5.1 Wetting liquidMay be a reagent grade solvent or asolvent blend,such as kerosene.5.2 HeliumMust be high purity,commercial grade.6.Conditioning6.1 These tests should be standardized at 23 6 2C(73.5 63.5F