1、Designation: C 1650 07Standard Practice forInstrumental Reflectance Measurement of Color for FlatGlass, Coated, and Uncoated1This standard is issued under the fixed designation C 1650; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice provides guidelines for the instrumentalreflectance measurement of the color of flat, coa
3、ted anduncoated glass. See Terminology E 284.1.2 The practice specifically excludes fluorescent and iri-descent samples.1.3 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of the
4、safety 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 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 2244 Practice for Calculat
5、ion of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesE 284 Terminology of AppearanceE 179 Guide for Selection of Geometric Conditions forMeasurement of Reflection and Transmission Properties ofMaterialsE 308 Practice for Computing the Colors of Objects byUsing th
6、e CIE SystemE 1164 Practice for Obtaining Spectrometric Data forObject-Color EvaluationE 1331 Test Method for Reflectance Factor and Color bySpectrophotometry Using Hemispherical Geometry2.2 CIE Standard:3CIE 15:2004 Colorimetry, Third Edition3. Summary of Practice3.1 The reflected color of glass pr
7、oducts, (see Guide E 179)is measured in reflectance specular included mode on aCIE-conforming diffuse geometry instrument. (See TestMethod E 1331 and CIE 15:2004.) The glass color is expressedin CIE tristimulus values based on spectral transmittancemeasurements over the full CIE spectral range of 35
8、0 780 nmwith a maximum 10-nm band pass. (See CIE 15:2004 andPractice E 308.) For color measurement, use of a truncatedspectral range of 400 700 nm is acceptable. (SeeCIE 15:2004.) Further information on the UV absorbing char-acteristics of the glass and/or glass coating may be determinedby examining
9、 the spectral data in the 350 - 400 nm range. If theinstrument allows spectral measurement above 700 nm, usefulinformation on the IR reflectance characteristics of the glasscoating may also be determined. If coatings are present, theycan be opaque or partially reflective.4. Significance and Use4.1 C
10、olor measurement quantifies the coating color for glassand is often related to coating thickness and composition aswell as tinting used in the substrate glass. The user of thisdocument defines an acceptable range of color appropriate forthe end use. Typical quality concerns for the reflected colorme
11、asurement of coated glass products are an indication ofconsistency in the coating process and verification of lot-to-lotcolor consistency for end-user acceptance.4.2 If the reflected color of a glass product is consistentfrom lot-to-lot and within agreed supplier-buyer acceptancecriteria, that produ
12、ct color is expected to be consistent andacceptable for end-use.1This practice is under the jurisdiction of ASTM Committee C14 on Glass andGlass Products and is the direct responsibility of Subcommittee C14.11 on OpticalProperties.Current edition approved Aug. 1, 2007. Published August 2007.2For ref
13、erenced 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 ASTM website.3Available from U.S. National Committee of the CIE (International Com
14、missionon Illumination), C/o Thomas M. Lemons, TLA-Lighting Consultants, Inc., 7 PondSt., Salem, MA 01970, http:/www.cie-usnc.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Apparatus5.1 For color measurements, a CIE-conformin
15、g diffusegeometry instrument capable of making reflectance measure-ments in the specular included mode is required.5.2 A fixturing device is required to consistently place thesample at the reflection port.5.3 To prevent transmitted signal from being part of themeasurement, a light trap capable of be
16、ing mounted behind theglass sample at the reflectance port may be required to measurepartially reflective coatings.5.4 The instrument and associated color quality software/firmware shall be capable of converting measured spectralreflectance data to CIE L*, a* b*; Hunter L, a, b; or Y x, yvalues calc
17、ulated for CIE illuminant D65 and the CIE 1964 10degree standard observer. (See Practice D 1164.) Any of thesemappings will serve as a full numerical color descriptor. (SeePractice E 308.) CIE Y luminosity can also serve as an over-allindicator of reflectance. For other illuminant/observer combi-nat
18、ions, see Practice E 308 for guidance in use. For effectivecommunication of color values between sites, color measure-ments must be expressed in the same color scale, illuminant,and standard observer.5.5 The expression of a tolerance in terms of rectangular,polar, or elliptical color differences sha
19、ll serve to quantify thedifference between target product color and lot color. (SeePractice D 2244.)6. Materials6.1 Samples are opaque or partially reflective coated glasswith defined substrate, coating compositions, and thicknesses.7. Hazards7.1 Consult current suppliers Material Safety Data Sheets
20、,and local regulations for all materials used in this test method.8. Color Instrument Calibration and Set Up Procedure8.1 Prepare instrument for operation by following the in-strument manufacturers instructions.8.2 Use instrument standardization to set the color instru-ment to the assigned values fo
21、r the light trap and white tilestandards supplied by the manufacturer or other suitablereference material.8.3 To document consistency in the color instrument perfor-mance over time, it is advisable to read and record color valuesfor an intermediate color standard and didymium filter (usuallyavailabl
22、e from the manufacturer). Care should be taken tovisually inspect these standards for any significant visualabrasion and replace it if warranted.8.4 As the stability characteristics of coated and non-coatedglass are generally good, the user may, at their option, read andrecord color values for a gla
23、ss sample to document consistencyin the measurement method over time. Care should be taken tovisually inspect the glass sample for any significant visualabrasion and replace it if warranted.9. Measurement Method9.1 Place the coated or non-coated glass sample at thereflectance port. If necessary, mou
24、nt a sample at the port usinga fixturing device, particularly if the sample is not flat.9.2 If the sample is partially reflective and the main interestis the specular color of a coating, back the sample with a lighttrap to prevent any light transmitted through the sample frombeing retroreflected bac
25、k through the sample.9.3 If translucent glass is being measured in reflectance,back the glass with a white tile as a constant surround.9.4 At a minimum, scan the sample over the range ofwavelengths required for measurement. Two scans with a 90rotation of the samples between scans are preferable. Ifp
26、ractical and possible, scan at least one other area of thesample as well.10. Report10.1 Report the following information:10.1.1 Sample identification,10.1.2 Clor scale, illuminant, standard observer, instrumentgeometry and transmittance mode;10.1.3 Smple preparation and presentation conditions, in-c
27、luding number and pattern of readings averaged.10.1.4 Average color or color difference values, or both, aproduct standard color to nearest hundredth of a unit.NOTE 1Sample preparation includes items of glass description suchas the type and form (single layer versus multi-layer IG; laminated, patter
28、nand thickness), as well as the surface preparation technique (cleaningmethod prior to measurement, polishing).NOTE 2Sample presentation includes any side or positional informa-tion; the area of view measured in each reading; the number of readingsaveraged and if readings were taken in a specific pa
29、ttern.10.1.5 The CIE Y value may also be reported to nearesthundredths of a unit, as an instrumental measure of the overallbrightness of the glass.11. Keywords11.1 coatings; color; glass; reflectanceASTM International takes no position respecting the validity of any patent rights asserted in connect
30、ion 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 any time by the responsibl
31、e 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 will receive careful cons
32、ideration 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 ASTM International, 100 B
33、arr 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).C1650072
