1、Designation: C1650 07C1650 14Standard Practice forInstrumental Reflectance Measurement of Color for FlatGlass, Coated, and Uncoated1This standard is issued under the fixed designation C1650; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year 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 This practice provides guidelines for the instrumental reflectance measurement of the color of fla
3、t, coated and uncoatedglass. See Terminology E284.1.2 The practice specifically excludes fluorescent and iridescent samples.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 This standard does not purport to address all
4、of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D2244 Practice for Calcu
5、lation of Color Tolerances and Color Differences from Instrumentally Measured Color CoordinatesE284 Terminology of AppearanceE179 Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of MaterialsE308 Practice for Computing the Colors of Objects by Usi
6、ng the CIE SystemE1164 Practice for Obtaining Spectrometric Data for Object-Color EvaluationE1331 Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry2.2 CIE Standard:3CIE 15:2004 Colorimetry, Third Edition3. Summary of Practice3.1 The reflected color of gla
7、ss products, (see Guide E179) is measured in reflectance specular included mode on aCIE-conforming diffuse geometry instrument. (See Test Method E1331 and CIE 15:2004.) The glass color is expressed in CIEtristimulus values based on spectral transmittance measurements over the full CIE spectral range
8、 of 350 780 nm with a maximum10-nm band pass. (See CIE 15:2004 and Practice E308.) For color measurement, use of a truncated spectral range of 400 700nm is acceptable. (See CIE 15:2004.) Further information on the UV absorbing characteristics of the glass and/or glass coating orglass coating, or bot
9、h, may be determined by examining the spectral data in the 350 - 400 nm range. If the instrument allowsspectral measurement above 700 nm, useful information on the IR reflectance characteristics of the glass coating may also bedetermined. If coatings are present, they can be opaque or partially refl
10、ective.4. Significance and Use4.1 Color measurement quantifies the coating color for glass and is often related to coating thickness and composition as wellas tinting used in the substrate glass. The user of this document defines an acceptable range of color appropriate for the end use.1 This practi
11、ce is under the jurisdiction of ASTM Committee C14 on Glass and Glass Products and is the direct responsibility of Subcommittee C14.11 on OpticalProperties.Current edition approved Aug. 1, 2007May 1, 2014. Published August 2007May 2014. Originally approved in 2007. Last previous edition approved in
12、2007 as C1650 07. DOI: 10.1520/C1650-07.10.1520/C1650-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Av
13、ailable from U.S. National Committee of the CIE (International Commission on Illumination), C/o Thomas M. Lemons, TLA-Lighting Consultants, Inc., 7 Pond St.,Salem, MA 01970, http:/www.cie-usnc.org.CIE Commission Internationale de LEclairage, Wien, Austria, www.cie.co.at.This document is not an ASTM
14、standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all
15、cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Typical quality concerns for the reflected color measurement of coated glass
16、products are an indication of consistency in the coatingprocess and verification of lot-to-lot color consistency for end-user acceptance.4.2 If the reflected color of a glass product is consistent from lot-to-lot and within agreed supplier-buyer acceptance criteria, thatproduct color is expected to
17、be consistent and acceptable for end-use.5. Apparatus5.1 For color measurements, a CIE-conforming diffuse geometry instrument capable of making reflectance measurements in thespecular included mode is required.5.2 A fixturingfixture device is required to consistently place the sample at the reflecti
18、on port.5.3 To prevent transmitted signal from being part of the measurement, a light trap capable of being mounted behind the glasssample at the reflectance port may be required to measure partially reflective coatings.5.4 The instrument and associated color quality software/firmware shall be capab
19、le of converting measured spectral reflectancedata to CIE L*, a* b*; Hunter L, a, b; or Y x,y values calculated for CIE illuminant D65 and the CIE 1964 10 degree standardobserver. (See Practice E1164.) Any of these mappings will serve as a full numerical color descriptor. (See Practice E308.) CIEY l
20、uminosity can also serve as an over-all indicator of reflectance. For other illuminant/observer combinations, see Practice E308for guidance in use. For effective communication of color values between sites, color measurements must be expressed in the samecolor scale, illuminant, and standard observe
21、r.5.5 The expression of a tolerance in terms of rectangular, polar, or elliptical color differences shall serve to quantify thedifference between target product color and lot color. (See Practice D2244.)6. Materials6.1 Samples are opaque or partially reflective coated glass with defined substrate, c
22、oating compositions, and thicknesses.7. Hazards7.1 Consult current suppliers Material Safety Data Sheets, 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 instrument manufacturer
23、s instructions.8.2 Use instrument standardization to set the color instrument to the assigned values for the light trap and white tile standardssupplied by the manufacturer or other suitable reference material.8.3 To document consistency in the color instrument performance over time, it is advisable
24、 to read and record color values foran intermediate color standard and didymium filter (usually available from the manufacturer). Care should be taken to visuallyinspect these standards for any significant visual abrasion and replace it if warranted.8.4 As the stability characteristics of coated and
25、 non-coated glass are generally good, the user may, at their option, read andrecord color values for a glass sample to document consistency in the measurement method over time. Care should be taken tovisually inspect the glass sample for any significant visual abrasion and replace it if warranted.9.
26、 Measurement Method9.1 Place the coated or non-coated glass sample at the reflectance port. If necessary, mount a sample at the port using afixturingfixture device, particularly if the sample is not flat.9.2 If the sample is partially reflective and the main interest is the specular color of a coati
27、ng, back the sample with a light trapto prevent any light transmitted through the sample from being retroreflectedretro-reflected back 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 samp
28、le over the range of wavelengths required for measurement. Two scans with a 90 rotation ofthe samples between scans are preferable. If practical and possible, scan at least one other area of the sample as well.10. Report10.1 Report the following information:10.1.1 Sample identification,10.1.2 ClorCo
29、lor scale, illuminant, standard observer, instrument geometry and transmittance mode;10.1.3 SmpleSample preparation and presentation conditions, including number and pattern of readings averaged.10.1.4 Average color or color difference values, or both, a product standard color to nearest hundredth o
30、f a unit.NOTE 1Sample preparation includes items of glass description such as the type and form (single layer versus multi-layer IG; laminated, pattern andthickness), as well as the surface preparation technique (cleaning method prior to measurement, polishing).C1650 142NOTE 2Sample presentation inc
31、ludes any side or positional information; the area of view measured in each reading; the number of readings averagedand if readings were taken in a specific pattern.10.1.5 The CIE Y value may also be reported to nearest hundredths of a unit, as an instrumental measure of the overallbrightness of the
32、 glass.11. Keywords11.1 coatings; color; glass; reflectanceASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such pat
33、ent 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 not revised, either reapproved or withdrawn.Your comments are invited eith
34、er 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 you may attend. If you feel that your comments have not received a fair h
35、earing 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C1650 143
