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ASTM C1650-07

(Practice)

Standard Practice for Instrumental Reflectance Measurement of Color for Flat Glass, Coated, and Uncoated

Standard Practice for Instrumental Reflectance Measurement of Color for Flat Glass, Coated, and Uncoated

SIGNIFICANCE AND USE
Color measurement quantifies the coating color for glass and is often related to coating thickness and composition as well as tinting used in the substrate glass. The user of this document defines an acceptable range of color appropriate for the end use. Typical quality concerns for the reflected color measurement of coated glass products are an indication of consistency in the coating process and verification of lot-to-lot color consistency for end-user acceptance.  
If the reflected color of a glass product is consistent from lot-to-lot and within agreed supplier-buyer acceptance criteria, that product color is expected to be consistent and acceptable for end-use.
SCOPE
1.1 This practice provides guidelines for the instrumental reflectance measurement of the color of flat, coated and uncoated glass. See Terminology E 284.
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 of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Jul-2007
ICS
17.180.20 - Colours and measurement of light
Technical Committee
C14 - Glass and Glass Products
Drafting Committee
C14.11 - Optical Properties
Current Stage
Ref Project

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ASTM C1650-07 - Standard Practice for Instrumental Reflectance Measurement of Color for Flat Glass, Coated, and UncoatedASTM C1650-07 - Standard Practice for Instrumental Reflectance Measurement of Color for Flat Glass, Coated, and Uncoated
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ASTM C1650-07 - Standard Practice for Instrumental Reflectance Measurement of Color for Flat Glass, Coated, and Uncoated
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1650 −07
StandardPractice for
Instrumental Reflectance Measurement of Color for Flat
Glass, Coated, and Uncoated
This standard is issued under the fixed designation C1650; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 CIE Standard:
CIE 15:2004 Colorimetry, Third Edition
1.1 This practice provides guidelines for the instrumental
reflectance measurement of the color of flat, coated and
3. Summary of Practice
uncoated glass. See Terminology E284.
3.1 The reflected color of glass products, (see Guide E179)
1.2 The practice specifically excludes fluorescent and iri-
is measured in reflectance specular included mode on a
descent samples.
CIE-conforming diffuse geometry instrument. (See Test
Method E1331 and CIE 15:2004.) The glass color is expressed
1.3 The values stated in SI units are to be regarded as
in CIE tristimulus values based on spectral transmittance
standard. No other units of measurement are included in this
measurementsoverthefullCIEspectralrangeof350–780nm
standard.
with a maximum 10-nm band pass. (See CIE 15:2004 and
1.4 This standard does not purport to address all of the
Practice E308.) For color measurement, use of a truncated
safety concerns, if any, associated with its use. It is the
spectral range of 400 – 700 nm is acceptable. (See CIE
responsibility of the user of this standard to establish appro-
15:2004.) Further information on the UV absorbing character-
priate safety and health practices and determine the applica-
istics of the glass and/or glass coating may be determined by
bility of regulatory limitations prior to use.
examining the spectral data in the 350 - 400 nm range. If the
instrument allows spectral measurement above 700 nm, useful
2. Referenced Documents
information on the IR reflectance characteristics of the glass
2.1 ASTM Standards:
coating may also be determined. If coatings are present, they
D2244 Practice for Calculation of Color Tolerances and
can be opaque or partially reflective.
Color Differences from Instrumentally Measured Color
4. Significance and Use
Coordinates
E284 Terminology of Appearance
4.1 Colormeasurementquantifiesthecoatingcolorforglass
E179 Guide for Selection of Geometric Conditions for
and is often related to coating thickness and composition as
Measurement of Reflection and Transmission Properties
well as tinting used in the substrate glass. The user of this
of Materials (Withdrawn 2012)
document defines an acceptable range of color appropriate for
E308 PracticeforComputingtheColorsofObjectsbyUsing
the end use. Typical quality concerns for the reflected color
the CIE System
measurement of coated glass products are an indication of
E1164 PracticeforObtainingSpectrometricDataforObject-
consistency in the coating process and verification of lot-to-lot
Color Evaluation
color consistency for end-user acceptance.
E1331 Test Method for Reflectance Factor and Color by
4.2 If the reflected color of a glass product is consistent
Spectrophotometry Using Hemispherical Geometry
from lot-to-lot and within agreed supplier-buyer acceptance
criteria, that product color is expected to be consistent and
acceptable for end-use.
This practice is under the jurisdiction of ASTM Committee C14 on Glass and
Glass Products and is the direct responsibility of Subcommittee C14.11 on Optical 5. Apparatus
Properties.
5.1 For color measurements, a CIE-conforming diffuse
Current edition approved Aug. 1, 2007. Published August 2007. DOI: 10.1520/
C1650-07. geometry instrument capable of making reflectance measure-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ments in the specular included mode is required.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Available from U.S. National Committee of the CIE (International Commission
The last approved version of this historical standard is referenced on on Illumination), C/o Thomas M. Lemons, TLA-Lighting Consultants, Inc., 7 Pond
www.astm.org. St., Salem, MA 01970, http://www.cie-usnc.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1650−07
5.2 A fixturing device is required to consistently place the 8.4 As the stability characteristics of coated and non-coated
sample at the reflection port. glass are generally good, the user may, at their option, read and
record color values for a glass sample to document consistency
5.3 To prevent transmitted signal from being part of the
in the measurement method over time. Care should be taken to
measurement, a light trap capable of being mounted behind the
visually inspect the glass sample for any significant visual
glass sample at the reflectance po
...

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5.1 The most direct and accessible methods for obtaining the color coordinates of object colors are by instrumental measurement using spectrophotometers or colorimeters with either hemispherical or bidirectional optical measuring systems. This test method provides procedures for such measurement by reflectance spectrophotometry using a hemispherical optical measuring system.  
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SCOPE
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4.1 Several standards, including Practices E991, E1164, and Test Methods E1331, E1348 and E1349, require either the presence or absence of fluorescence exhibited by the specimen for correct application. This practice provides spectrophotometric procedures for identifying the presence of fluorescence in materials.  
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4.6 This practice describes methods to detect the...
SCOPE
1.1 This practice provides spectrophotometric methods for detecting the presence of fluorescence in object-color specimens.
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1.2 This practice requires the use of a spectrophotometer that both irradiates the specimen over the wavelength range from 340 nm to 700 nm and allows the spectral distribution of illumination on the specimen to be altered as desired.  
1.3 Within the above limitations, this practice is general in scope rather than specific as to instrument or material.  
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SIGNIFICANCE AND USE
5.1 The most general and reliable methods for obtaining CIE tristimulus values or, through transformation of them, other coordinates for describing the colors of objects are by the use of spectrometric data. Colorimetric data are obtained by combining object spectral data with data representing a CIE standard observer and a CIE standard illuminant, as described in Practice E308.  
5.2 This practice provides procedures for selecting the operating parameters of spectrometers used for providing data of the desired precision. It also provides for instrument calibration by means of material standards, and for selection of suitable specimens for obtaining precision in the measurements.
SCOPE
1.1 This practice covers the instrumental measurement requirements, calibration procedures, and material standards needed to obtain precise spectral data for computing the colors of objects.  
1.2 This practice lists the parameters that must be specified when spectrometric measurements are required in specific methods, practices, or specifications.  
1.3 Most sections of this practice apply to both spectrometers, which can produce spectral data as output, and spectrocolorimeters, which are similar in principle but can produce only colorimetric data as output. Exceptions to this applicability are noted.  
1.4 This practice is limited in scope to spectrometers and spectrocolorimeters that employ only a single monochromator. This practice is general as to the materials to be characterized for color.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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Standard Test Method for Obtaining Colorimetric Data From a Visual Display Unit by Spectroradiometry

SIGNIFICANCE AND USE
5.1 The most fundamental method for obtaining CIE tristimulus values or other color coordinates for describing the colors of visual display units (VDUs) is by the use of spectroradiometric data. (See CIE No. 18 and 63.) These data are used by summation together with numerical values representing the 1931 CIE Standard Observer and normalized to Km, the maximum spectral luminous efficacy function.  
5.2 The special requirements for characterizing VDUs possessing narrow or discontinuous spectra are presented and discussed. Modifications to the requirements of Practice E308 are given to correct for the unusual nature of narrow or discontinuous sources.
SCOPE
1.1 This test method prescribes the instrumental measurements required for characterizing the color and brightness of VDUs.  
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