ASTM_D_5301_-_92_2016.pdf

Designation:D530192(Reapproved 2016)Standard Practice forPhysical Characterization of Paint Brushes1This standard is issued under the fixed designation D5301;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 covers the dimensions,terminology,ma-terials and characteristics generally considered of importanceto those within,or dealing with paint brushes,and describesmethods of determining these parameters.This practice is notmeant to be a definitive analytical method to deformulatebrushes.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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.2.Terminology2.1 Definitions:2.1.1 chisel(or chiseled),na description of the configu-ration of the tip of the brush as being of a more or less convexshape across the thickness dimension.2.1.2 flat tip,na description of the configuration of the tipof the brush as being flat or of uniform length across thethickness dimension.2.1.3 flagged,na term describing the tip of a filament orbristle as being split resulting in a multiplicity of filament ends.2.1.4 tipped,na term describing the tip of a filament orbristle as coming to a point.2.1.5 microtome,na device for holding a number offilament or bristle materials in a rigid state for a cross sectionalexamination under a microscope(see Fig.1).3.Significance and Use3.1 It is important to recognize that a brush can be a mixtureof several chemically different filaments or bristles,or both,inseveral cross sections,thicknesses and lengths.The followingprocedures will be helpful in identifying brush composition.4.Determination of Head Dimensions4.1 WidthDetermine the width by measuring the brushingmaterial adjacent to the ferrule in the wide or broad dimension,using any accurate linear measuring device.Report dimensionsto the nearest 3 mm(18in.).4.2 ThicknessDetermine the thickness by measuring thebrushing material adjacent to the ferrule,in the narrowdimension,using any accurate linear measuring device.Reportdimensions to the nearest 1 mm(116in.).4.3 Length Clear(Length Out)Determine the length bymeasuring the exposed filament or bristle length from the edgeof the ferrule to its tip,using any accurate linear measuringdevice.Measure the brush on each end of the width andaverage the measurements so obtained to give the mean value.Report dimensions to the nearest 1 mm(116in.).NOTE1In the case of an angular sash brush,indicate whether theferrule is angular or straight.5.Brush Tip Configuration5.1 Describe the configuration at the tip of the head aschiseled or flat(see 2.1.1 and 2.1.2).6.Brushing Material Characteristics6.1 Cross-Sectional ShapeDetermine the cross-sectionalshape of the filaments or bristles by inserting a representativesample of brushing material into the slot of a microtome,cutting the material flush with the surface of the microtomewith a razor blade,and examining it visually with a 30 orgreater microscope.Report the observations of filament shapesfor example,round,solid,hollow or others.6.2 Filament or Bristle LengthDetermine the lengths ofthe filaments or bristles used in a brush by opening the ferruleand removing the filaments from that portion of the brushunaffected by the chisel.Measure a representative number ofspecimens to the nearest 1 mm(116in.),and report the lengthor various lengths.6.3 Filament or Bristle Thickness and ProfileRemove arepresentative sample of filaments or bristles(10 to 20)fromthe brush as described in 6.2 and measure their thickness or1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.61 on Paint Application Tools.Current edition approved Dec.1,2016.Published December 2016.Originallyapproved in 1992.Last previous edition approved in 2012 as D5301 92(2012).DOI:10.1520/D5301-92R16.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 diameter using a micrometer.Take measurements with a dialmicrometer near each end.Those having the same measure-ment on each end are termed“level”and only one dimensionis expressed;those having differences by 2 mils or more aretermed“tapered”and the two dimensions are expressed as“thicker dimension/thinner dimension.”Express dimensions inthousandths of an inch or hundredths of a millimeter.6.4 Filament or Bristle ColorDetermine how many dif-ferent color filaments are present.This will