1、Designation: D5382 02 (Reapproved 2017)Standard Guide toEvaluation of Optical Properties of Powder Coatings1This standard is issued under the fixed designation D5382; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe term optical properties of powder coatings refers to those properties associated with theinteraction of visible light
3、with the coatings. These properties include, but are not limited to, color,color difference, gloss, and metamerism. Coating powder users and producers may sometimes beoverwhelmed by the sheer number of standard practices and standard test methods available for theevaluation of the optical properties
4、 of the finished coatings.This guide is intended to lead the user to each of the practices and test methods needed, once theuser decides whether the evaluation is to be by visible means or by instrumental means. Further, theuser must decide which of the several optical properties mentioned above are
5、 to be evaluated. Thisguide will lead the user to the applicable practices and test methods for the properties chosen by themeans selected.1. Scope1.1 This standard provides the user with a guide to thevarious available practices and test methods for the evaluationof color, color difference, gloss,
6、and metamerism by bothvisual and by instrumental means.1.2 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
7、 of regulatory limitations prior to use.1.3 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
8、 Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD1535 Practice for Specifying Color by the Munsell SystemD1729 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque Mat
9、erialsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD2616 Test Method for Evaluation of Visual Color Differ-ence With a Gray ScaleD3134 Practice for Establishing Color and Gloss TolerancesD4039 Test Method for Reflection Haze of
10、High-GlossSurfacesD4086 Practice for Visual Evaluation of MetamerismD4449 Test Method for Visual Evaluation of Gloss Differ-ences Between Surfaces of Similar AppearanceD5767 Test Methods for Instrumental Measurement ofDistinctness-of-Image Gloss of Coating SurfacesE284 Terminology of AppearanceE308
11、Practice for Computing the Colors of Objects by Usingthe CIE SystemE430 Test Methods for Measurement of Gloss of High-GlossSurfaces by Abridged GoniophotometryE1247 Practice for Detecting Fluorescence in Object-ColorSpecimens by SpectrophotometryE1331 Test Method for Reflectance Factor and Color byS
12、pectrophotometry Using Hemispherical GeometryE1345 Practice for Reducing the Effect of Variability ofColor Measurement by Use of Multiple MeasurementsE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus ColorimetryE1349 Test Method for Reflectance Factor and Color bySpectroph
13、otometry Using Bidirectional (45:0 or 0:45)Geometry1This guide is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.51 on Powder Coatings.Current edition approved June 1, 2017. Published June 201
14、7. Originallyapproved in 1993. Last previous edition approved in 2013 as D5382 02 (2013).DOI: 10.1520/D5382-02R17.2For 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 th
15、e standards Document Summary page onthe ASTM website.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 t
16、he Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1E1360 Practice for Specifying Color by Using the OpticalSociety of America Uniform Color Scales SystemE1541 Practice
17、 for Specifying and Matching Color Usingthe Colorcurve System (Withdrawn 2007)33. Terminology3.1 The definitions in Terminology E284 are applicable tothe appearance terms used in this standard. The followingterms from Terminology E284 are specific to this standard.3.2 Definitions of Terms Specific t
18、o This Standard:3.2.1 coating powder(s), 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 f
19、ilm.3.2.2 color, n(2) perceived, attribute of visual perceptionthat can be described by color names such as white, gray,black, yellow, brown, vivid red, deep reddish purple, or bycombinations of such names.(3) psychophysical, characteristics of a color stimulus (thatis, light producing a sensation o
20、f color) denoted by a colori-metric specification with three values, such as tristimulusvalues.3.2.3 color difference, n(1) perceived, the magnitude andcharacter of the difference between two colors described bysuch terms as redder, bluer, lighter, darker, grayer, or cleaner.(2) computed, the magnit
21、ude and direction of the differencebetween two psychophysical color stimuli and their compo-nents computed from tristimulus values, or chromaticity coor-dinates and luminance factor, by means of a specified set ofcolor-difference equations.3.2.4 gloss, nangular selectivity of reflectance, involvings
22、urface reflected light, responsible for the degree to whichreflected highlights or images of objects may be seen assuperimposed on a surface.3.2.5 metamerism, nproperty of two specimens that matchunder a specified illuminator and to a specified observer andwhose spectral reflectances or transmittanc
23、es differ in thevisible wavelengths.3.2.6 powder coatings, ncoatings which are protective ordecorative, or both, formed by the application of a coatingpowder to a substrate and fused in a continuous film by theapplication of heat or radiant energy.4. Visual Evaluation of Optical Properties4.1 Visual
24、 GlossTo assess the visual gloss differencebetween two powder coated surfaces of similar appearance useTest Method D4449.4.2 ColorTo obtain the color notation of a specimen in theMunsell Color Order System use Practice D1535. To obtain thecolor notation of a specimen in the Optical Society of Americ
25、aUniform Color System use Practice E1360. To obtain the colornotation of a specimen in the Colorcurve System use PracticeE1541.4.3 Color DifferencePractice D1729 will provide visualcolor difference in descriptive terms. If it is desirable toquantify the color difference visually, use Test Method D26
26、16.4.4 MetamerismCarry out visual evaluation of a meta-meric pair of specimens by Practice D4086.4.5 Miscellaneous Optical PropertiesEvaluate visuallyreflection haze of high gloss surfaces, as well as distinctness-of-image gloss, by Test Method D4449.5. Instrumental Evaluation of Optical Properties5
27、.1 Specular GlossMeasure the specular gloss of a pow-der coating by Test Method D523.5.2 ColorIf filter photometry is to be employed, use TestMethod E1347. If spectrophotometric means are to beemployed, acquire spectral data on instruments having 45illumination and normal viewing by Test Method E134
28、9, andon instruments having an integrating sphere by Test MethodE1331. The spectrophotometric data are then integrated totristimulus values by Practice E308.5.3 Color DifferenceEvaluate the color difference be-tween two powder-coating specimens by Practice D2244 usingthe tristimulus values acquired
29、in 5.2.5.4 MetamerismAlthough Practice D4086 is a visualmethod, Note 1 to Section 7 in that practice describes a methodfor comparison of spectral curves of two specimens to detectthe presence of metamerism.5.5 Miscellaneous Optical Properties and MethodsEvaluate reflection haze of high gloss surface
30、s instrumentallyby Test Method D4039. Evaluate distinctness-of-image glossof high gloss surfaces by Test Methods E430 or by TestMethods D5767. Fluorescence in a powder coating may beidentified by Test Method E1247. Establish color and glosstolerances by Practice D3134. Practice E1345 gives methods o
31、freducing the variability of color measurements by makingmultiple measurements.6. Report6.1 Reports that may be required are contained in each ofseveral referenced standards that may be utilized as a result offollowing this guide.7. Keywords7.1 appearance; coating powders; color; color difference;gl
32、oss; metamerism; powder coatings3The last approved version of this historical standard is referenced onwww.astm.org.D5382 02 (2017)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard
33、 are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif n
34、ot revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which
35、 you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,Uni
36、ted States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 02 (2017)3
