1、Designation: D 5382 02 (Reapproved 2007)Standard Guide toEvaluation of Optical Properties of Powder Coatings1This standard is issued under the fixed designation D 5382; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 lig
3、ht 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 propert
4、ies 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
5、are 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, glo
6、ss, 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-bi
7、lity of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 523 Test Method for Specular GlossD 1535 Practice for Specifying Color by the Munsell Sys-temD 1729 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque MaterialsD 2244 Pr
8、actice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD 2616 Test Method for Evaluation of Visual Color Differ-ence With a Gray ScaleD 3134 Practice for Establishing Color and Gloss Toler-ancesD 4039 Test Method for Reflection Haze of High-Gloss
9、SurfacesD 4086 Practice for Visual Evaluation of MetamerismD 4449 Test Method for Visual Evaluation of Gloss Differ-ences Between Surfaces of Similar AppearanceD 5767 Test Methods for Instrumental Measurement ofDistinctness-of-Image Gloss of Coating SurfacesE 284 Terminology of AppearanceE 308 Pract
10、ice for Computing the Colors of Objects byUsing the CIE SystemE 430 Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry3E 1247 Practice for Detecting Fluorescence in Object-ColorSpecimens by SpectrophotometryE 1331 Test Method for Reflectance Factor and Color byS
11、pectrophotometry Using Hemispherical GeometryE 1345 Practice for Reducing the Effect of Variability ofColor Measurement by Use of Multiple MeasurementsE 1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus ColorimetryE 1349 Test Method for Reflectance Factor and Color bySpectr
12、ophotometry Using Bidirectional (45:0 or 0:45)GeometryE 1360 Practice for Specifying Color by Using the OpticalSociety of America Uniform Color Scales SystemE 1541 Practice for Specifying and Matching Color Using1This guide is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings
13、, Materials, and Applications and is the direct responsibility ofSubcommittee D01.51 on Powder Coatings.Current edition approved June 1, 2007. Published June 2007. Originallyapproved in 1993. Last previous edition approved in 2002 as D 5382 02.2For referenced ASTM standards, visit the ASTM website,
14、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.3Withdrawn.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr
15、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.the Colorcurve System33. Terminology3.1 The definitions in Terminology E 284 are applicable tothe appearance terms used in this standard. The followingterms from Terminology E 284 are specific to this standard.3.2 Definitions
16、 of Terms Specific to This Standard:3.2.1 coating powder(s), nfinely divided particles ofresin, either thermoplastic or thermosetting, generally incorpo-rating pigments, fillers, and additives and remaining finelydivided during storage under suitable conditions, which, afterfusing and possibly curin
17、g, 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, light p
18、roducing 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 cleaner.(2
19、) 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 of r
20、eflectance, 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 thatmatch under a specified illuminator and to a specified observerand whose spectral reflec
21、tances 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 Optica
22、l Properties4.1 Visual Gloss: To assess the visual gloss differencebetween two powder coated surfaces of similar appearance useTest Method D 4449.4.2 Color: To obtain the color notation of a specimen in theMunsell Color Order System use Practice D 1535. To obtainthe color notation of a specimen in t
23、he Optical Society ofAmerica Uniform Color System use Practice E 1360. To obtainthe color notation of a specimen in the Colorcurve System usePractice E 1541.4.3 Color Difference: Practice D 1729 will provide visualcolor difference in descriptive terms. If it is desirable toquantify the color differe
24、nce visually, use Test Method D 2616.4.4 Metamerism: Carry out visual evaluation of a metamericpair of specimens by Practice D 4086.4.5 Miscellaneous Optical Properties: Evaluate visuallyreflection haze of high gloss surfaces, as well as distinctness-of-image gloss, by Test Method D 4449.5. Instrume
25、ntal Evaluation of Optical Properties5.1 Specular Gloss: Measure the specular gloss of a powdercoating by Test Method D 523.5.2 Color: If filter photometry is to be employed, use TestMethod E 1347. If spectrophotometric means are to be em-ployed, acquire spectral data on instruments having 45 illu-m
26、ination and normal viewing by Test Method E 1349, and oninstruments having an integrating sphere by Test MethodE 1331. The spectrophotometric data are then integrated totristimulus values by Practice E 308.5.3 Color Difference: Evaluate the color difference betweentwo powder-coating specimens by Pra
27、ctice D 2244 using thetristimulus values acquired in 5.2.5.4 Metamerism: Although Practice D 4086 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
28、Methods: Evalu-ate reflection haze of high gloss surfaces instrumentally by TestMethod D 4039. Evaluate distinctness-of-image gloss of highgloss surfaces by Test Methods E 430 or by Test MethodsD 5767. Fluorescence in a powder coating may be identified byTest Method E 1247. Establish color and gloss
29、 tolerances byPractice D 3134. Practice E 1345 gives methods of reducingthe variability of color measurements by making multiplemeasurements.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. Keywo
30、rds7.1 appearance; coating powders; color; color difference;gloss; metamerism; powder coatingsD 5382 02 (2007)2SUMMARY OF CHANGESCommittee D01 has identified the location of selected changes to this standard since the last issue(D 5382 - 95) that may impact the use of this standard.Minor changes to:
31、(1) Introduction.(2) D 5767 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 rights asserted in connection with any item mentionedin this sta
32、ndard. 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 any time by the responsible technical committee and must be revi
33、ewed 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 will receive careful consideration at a meeting of theresponsib
34、le 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 ASTM 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).D 5382 02 (2007)3
