1、Designation: D5382 02 (Reapproved 2013)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. Scope*1.1 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-bilit
7、y of regulatory limitations prior to use.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 MaterialsD2244 Practice f
8、or 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 High-GlossSurfacesD408
9、6 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 Practice for Computing
10、 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 bySpectrophotometry Using
11、 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 bySpectrophotometry Using Bidirec
12、tional (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, 2013. Published July 2013. Originally approved
13、in 1993. Last previous edition approved in 2007 as D5382 02 (2007). DOI:10.1520/D5382-02R13.2For 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 S
14、ummary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1E1360 Practice for Specifying Color by Using the OpticalSociety of America Uniform Color S
15、cales SystemE1541 Practice 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 Defin
16、itions of Terms Specific to 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 c
17、uring, give a continuous film.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, lig
18、ht producing a sensation of 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 cleane
19、r.(2) computed, the magnitude 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
20、of reflectance, involvingsurface 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 re
21、flectances or transmittances 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 Op
22、tical Properties4.1 Visual Gloss: To assess the visual gloss differencebetween two powder coated surfaces of similar appearance useTest Method D4449.4.2 Color: To obtain the color notation of a specimen in theMunsell Color Order System use Practice D1535. To obtain thecolor notation of a specimen in
23、 the Optical Society of AmericaUniform Color System use Practice E1360. To obtain the colornotation of a specimen in the Colorcurve System use PracticeE1541.4.3 Color Difference: Practice D1729 will provide visualcolor difference in descriptive terms. If it is desirable toquantify the color differen
24、ce visually, use Test Method D2616.4.4 Metamerism: Carry out visual evaluation of a metamericpair of specimens by Practice D4086.4.5 Miscellaneous Optical Properties: Evaluate visuallyreflection haze of high gloss surfaces, as well as distinctness-of-image gloss, by Test Method D4449.5. Instrumental
25、 Evaluation of Optical Properties5.1 Specular Gloss: Measure the specular gloss of a powdercoating by Test Method D523.5.2 Color: If filter photometry is to be employed, use TestMethod E1347. If spectrophotometric means are to beemployed, acquire spectral data on instruments having 45illumination an
26、d normal viewing by Test Method E1349, andon instruments having an integrating sphere by Test MethodE1331. The spectrophotometric data are then integrated totristimulus values by Practice E308.5.3 Color Difference: Evaluate the color difference betweentwo powder-coating specimens by Practice D2244 u
27、sing thetristimulus values acquired in 5.2.5.4 Metamerism: Although 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 Methods: Evalu-
28、ate reflection haze of high gloss surfaces instrumentally by TestMethod D4039. Evaluate distinctness-of-image gloss of highgloss surfaces by Test Methods E430 or by Test MethodsD5767. Fluorescence in a powder coating may be identified byTest Method E1247. Establish color and gloss tolerances byPract
29、ice D3134. Practice E1345 gives methods of reducing thevariability of color measurements by making multiple mea-surements.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;
30、coating powders; color; color difference;gloss; metamerism; powder coatings3The last approved version of this historical standard is referenced onwww.astm.org.D5382 02 (2013)2SUMMARY OF CHANGESCommittee D01 has identified the location of selected changes to this standard since the last issue (D5382
31、- 95)that may impact the use of this standard.Minor changes to:(1) Introduction.(2) D5767 added to Section 2.(3)Added coating powder(s) and powder coatings to Section 3.(4) Appearance and coating powders added to Section 7.ASTM International takes no position respecting the validity of any patent ri
32、ghts asserted in connection with any item mentionedin this standard. Users of this standard 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 an
33、y time by the responsible technical committee and must be reviewed every five years andif not 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 w
34、ill receive careful consideration at a meeting of theresponsible technical committee, which 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 A
35、STM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United 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 ASTM website (www.astm.org/COPYRIGHT/).D5382 02 (2013)3
