ASTM E430-2011 5000 Standard Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry《用简化滤色测角光度计测定高上光表面光泽度的标准试验方法》.pdf
《ASTM E430-2011 5000 Standard Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry《用简化滤色测角光度计测定高上光表面光泽度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E430-2011 5000 Standard Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry《用简化滤色测角光度计测定高上光表面光泽度的标准试验方法》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E430 11Standard Test Methods forMeasurement of Gloss of High-Gloss Surfaces by AbridgedGoniophotometry1This standard is issued under the fixed designation E430; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、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 cover the measurement of thereflection characteristics responsible for the glossy appearanceof h
3、igh-gloss surfaces. Three test methods, A, B and C, areprovided for evaluating such surface characteristics at specularangles of 30, 20 and 30, respectively. These test methods arenot suitable for diffuse finish surfaces nor do they measurecolor, another appearance attribute.1.2 As originally develo
4、ped by Tingle and others (see Refs1 and 2),2the test methods were applied only to bright metals.Recently they have been applied to high-gloss automotivefinishes and other nonmetallic surfaces.1.3 The DOI of a glossy surface is generally independent ofits curvature. The DOI measurement by this test m
5、ethod islimited to flat or flattenable surfaces.2. Referenced Documents2.1 ASTM Standards:3D523 Test Method for Specular GlossD2457 Test Method for Specular Gloss of Plastic Films andSolid PlasticsE171 Specification for Atmospheres for Conditioning andTesting Flexible Barrier MaterialsE177 Practice
6、for Use of the Terms Precision and Bias inASTM Test MethodsE179 Guide for Selection of Geometric Conditions forMeasurement of Reflection and Transmission Properties ofMaterialsE284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects byUsing the CIE SystemE691 Practice for Cond
7、ucting an Interlaboratory Study toDetermine the Precision of a Test MethodE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus Colorimetry3. Terminology3.1 DefinitionsAppearance terms in this test method arein accordance with Terminology E284.3.2 Terms that are defined in Ter
8、minology E284, but have aspecific definition in this method are:3.2.1 reflectance, p, nratio of the reflected radiant orluminous flux to the incident flux in the given conditions.(E284)3.2.1.1 DiscussionThe term reflectance is often used in ageneral sense or as an abbreviation for reflectance factor
9、. Suchusage is not assumed in this method. The definition mayrequire that the term be modified by adjectives denoting thespectral and geometric conditions of measurement.3.3 Definitions of Terms Specific to This Standard:3.3.1 reflection haze, H, nfor a specified specular angle,ratio of flux reflect
10、ed at a specified angle (or angles) from thespecular direction to the flux similarly reflected at the specularangle by a specified gloss standard.3.3.1.1 DiscussionModifiers may be used to specify theangles at which the haze is measured (for example, 2, 5 or15); whether H or a logarithmic form is to
11、 be stated; orwhether H is to be compensated for the luminance of thespecimen by multiplication by Yspecimen/Yn, where n denotes thereference white; or any combination of these.3.3.2 metallic brightness, nfreedom of a metal surfacefrom diffuse haze or texture.1These test methods are under the jurisd
12、iction of ASTM Committee E12 onColor and Appearance and are the direct responsibility of Subcommittee E12.03 onGeometry.Current edition approved June 1, 2011. Published June 2011. Originallyapproved in 1971. Last previous edition approved in 2005 as E430 05. DOI:10.1520/E0430-11.2The boldface number
13、s in parentheses refer to the list of references at the end ofthis method.3For 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
14、ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.3.3 with-machine direction, nthe axis of a specimenthat is parallel to the direction of mill rolling or extrusion, orother surface-finish texture.3.3.4 across-machine dir
15、ection, nthe perpendicular towith-machine direction.4. Summary of Test Method4.1 Several geometrically different measures of light re-flected by a surface are proposed for use in describing its glossappearance.4.1.1 Test Method AAgloss reflectance factor is measuredat 30 to the specimen normal using
16、 narrow illuminator andreceiver aperture angles (0.5 wide maximum). Distinctness-of-image gloss is measured at 29.7 or 30.3, or both. Narrow-angle (2) reflection haze is measured at 28 or 32, or both,and wide-angle (5) reflection haze at 25 or 35, or both. Theratio of reflectance factors for 28 or 3
17、2, or both, perpendicu-lar and parallel to the machine direction of the specimen, iscomputed as a measure of directionality.4.1.2 Test Method BAspecular gloss is measured at 20 inaccordance with Test Method D523, and narrow-angle reflec-tion haze is measured at 18.1 and 21.9. For additionalinformati
18、on on the selection of geometric conditions, seeGuide E179.4.1.3 Test Method CAgloss reflectance factor is measuredat 30 to the specimen normal using narrow illuminator andreceiver aperture angles (0.5 wide maximum). Distinctness-of-image gloss is measured at 29.7 and 30.3. Narrow-angle(2) reflectio
19、n haze is measured at 28 and 32, and wide-angle(15) reflection haze at 15.5. Significance and Use5.1 The gloss of metallic finishes is important commerciallyon metals for automotive, architectural, and other uses wherethese metals undergo special finishing processes to produce theappearances desired
20、. It is important for the end-products,which use such finished metals that parts placed together havethe same glossy appearance.5.2 It is also important that automotive finishes and otherhigh-gloss nonmetallic surfaces possess the desired finishedappearance. The present method identifies by measurem
21、entsimportant aspects of finishes. Those having identical sets ofFIG. 1 Optical Diagram of the Apparatus for Method AE430 112numbers normally have the same gloss characteristics. Itusually requires more than one measurement to identifyproperly the glossy appearance of any finish (see Refs 3 and 4).6
22、. Apparatus6.1 The apparatus shall be an abridged goniophotometer(see Fig. 1, Fig. 2, and Fig. 3). The abridged goniophotometermay have a fixed angle of incidence (for Test Method A, 30;for Test Method B, 20; for Test Method C, 30) and specificfixed directions of view at which the flux from the spec
23、imen ismeasured (see Table 1, Table 2, and Table 3).46.1.1 Geometric Conditions for Test Method AThe direc-tion of incidence shall be 30. The directions of view shall beopposite the direction of incidence at 30 for specular reflec-tance, 29.7 or 30.3 for distinctness of image comparisons,28 or 32 fo
24、r narrow-angle haze comparisons, and 25 or 35for wide-angle haze comparisons. The angular dimensions ofthe mirror reflected image of the source slit in the plane ofmeasurement and the angular dimensions of the receiverwindows in this plane of measurement shall be as shown inTable 1.6.1.2 Geometric C
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