ASTM_D_5767_-_95_2012.pdf

Designation:D576795(Reapproved 2012)Standard Test Methods forInstrumental Measurement of Distinctness-of-Image Glossof Coating Surfaces1This standard is issued under the fixed designation D5767;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 describes the measurement of thedistinctness-of-image(DOI)gloss of coating surfaces usingelectro-optical measuring techniques.The coatings must beapplied to planar rigid surfaces.The scale values obtained fromthe alternative methods cited do not agree.1.2 Three test methods are covered as follows:1.2.1 Test Method AGloss reflectance factor measure-ments are made on the specimen at the specular viewing angleand at an angle slightly off the specular viewing angle.Thevalues obtained are combined to provide a DOI value.Verynarrow source and receptor aperture angles are used in themeasurements.1.2.2 Test Method BThe light through a small slit isprojected on the specimen surface and its reflected imageintensity is measured through a sliding combed shutter toprovide a value of image clarity.1.2.3 Test Method CThe light through a pattern is pro-jected on the specimen surface and its reflected image intensityis measured directly to provide a value of image clarity.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD2457 Test Method for Specular Gloss of Plastic Films andSolid PlasticsD3964 Practice for Selection of Coating Specimens forAppearance MeasurementsD4039 Test Method for Reflection Haze of High-GlossSurfacesE284 Terminology of AppearanceE430 Test Methods for Measurement of Gloss of High-GlossSurfaces by Abridged Goniophotometry2.2 Other Standards:ISO 10216 Anodized Aluminum and Aluminum AlloysInstrumental Determination of Image Clarity of AnodicOxidation CoatingsInstrumental Method33.Terminology3.1 Terms and Definitions in Terminology E284 are appli-cable to these methods.3.2 Definitions:3.2.1 distinctness-of-image gloss,naspect of gloss char-acterized by the sharpness of images of objects produced byreflection at a surface.E2843.2.1.1 DiscussionThis quality is sometimes called ImageClarity.3.2.2 gloss reflectance factor,Rs,nratio of the specularlyreflected part of the(whole)flux reflected from the specimen tothe flux reflected from a specified gloss standard under thesame geometric and spectral conditions of measurements.E2843.2.2.1 DiscussionThe gloss standard may be a blackglass or mirror and may be assigned one of a variety of scalevalues as specified.3.2.3 specular angle,nthe angle of reflection equal andopposite to the angle of incidence.E2841This test method is under the jurisdiction of ASTM Committee E12 on Colorand Appearance and is the direct responsibility of Subcommittee E12.03 onGeometry.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1995.Last previous edition approved in 2004 as D5767 95(2004).DOI:10.1520/D5767-95R12.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 An important aspect of the appearance of glossy coatingsurfaces is the distinctness(clarity)of images reflected bythem.The values obtained by the measuring procedures givenin these methods generally correlate well with visual ratings forDOI(image clarity).44.2 Although Test Methods D523 and D4039 are useful incharacterizing some aspects of glossy appearance,they do notprovide satisfactory ratings for DOI(image clarity).4.3 The measurement conditions given conform to theconditions specified in Test Methods E430.4.4 The measurement conditions given in Test Methods Band C conform to the conditions specified in ISO 10216.4.5 The scale values obtained with the measuring proce-dures of these methods range from 0 to 100 with a value of 100representing perfect DOI(image clarity).4.6 The DOI(image clarity)scale value does not of itself,indicate any specific cause for reduction in reflected imagesharpness.Surface irregularities such as haze,orange peel,