1、Designation:D576718Standard Test Method forInstrumental Measurement of Distinctness-of-Image(DOI)Gloss of Coated 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 y
2、ear 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 test methods describe the measurement of thedistinctness-of-image(DOI)gloss of coating surfaces usingelectro-o
3、ptical measuring techniques.1.2 The coatings assessed shall be applied to planar rigidsurfaces.1.3 Test MethodThe light through a small slit is projectedon the specimen surface and its reflected image intensity ismeasured through a sliding combed shutter to provide a valueof image clarity.1.4 The va
4、lues stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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 safet
5、y,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Int
6、ernational Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD823 Practices for Producing Films of Uniform Thicknessof Paint,Coatings and Related Products
7、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
8、-GlossSurfaces by Abridged GoniophotometryE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standards:3ISO 10216 Anodizing of Aluminum and its AlloysInstrumental Determination of Image Clarity of AnodicOxidation CoatingsInstrumental MethodISO 172
9、21 PlasticsDetermination of Image Clarity(de-gree of sharpness of reflected or transmitted image)ISO 116641 Colorimetry Part 1CIE standard colorimet-ric observersISO 116642 Colorimetry Part 2CIE standard illuminants3.Terminology3.1 DefinitionsTerms and definitions in TerminologyE284 are applicable t
10、o these methods.3.1.1 distinctness-of-image(DOI)gloss,naspect of glosscharacterized by the sharpness of images of objects producedby reflection at a surface.E2843.1.1.1 DiscussionThis quality is sometimes called imageclarity.3.1.2 gloss reflectance factor,Rs,nratio of the specularlyreflected part of
11、 the(whole)flux reflected from the specimen tothe flux reflected from a specified gloss standard under thesame geometric and spectral conditions of measurements.E2843.1.2.1 DiscussionThe gloss standard may be a blackglass or mirror and may be assigned one of a variety of scalevalues as specified.3.1
12、.3 specular angle,nangle of reflection equal and op-posite 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 Oct.1,2018.Published October 2
13、018.Originallyapproved in 1995.Last previous edition approved in 2017 as D5767 17.DOI:10.1520/D5767-18.2For 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 Docu
14、ment 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 StatesThis international standard was de
15、veloped 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 4.Significance and
16、 Use4.1 An important aspect of the appearance of glossy coatingsurfaces is the distinctness(clarity)of images reflected bythem.The values obtained in this measuring procedure corre-late well with visual ratings for DOI(image clarity).4.2 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
