ASTM C1649-14

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

SIGNIFICANCE AND USE
4.1 Color measurement quantifies the transmitted color for glass. The user defines an acceptable range of color appropriate for the end use. A typical quality concern for transmittance color measurement of glass products is verification of lot-to-lot color consistency for end-user acceptance.  
4.2 If the transmitted color of a glass product is consistent from lot-to-lot and within agreed supplier-buyer acceptance criteria, the product’s color is expected to be consistent and acceptable for end-use.
SCOPE
1.1 This practice provides guidelines for the instrumental transmittance measurement of the color of coated and uncoated transparent glass. 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 the standard. The values given in parentheses are for information only.  
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: 30-Apr-2014
• ICS: 17.180.20 - Colours and measurement of light
• ICS: 81.040.30 - Glass products
• Technical Committee: C14 - Glass and Glass Products
• Drafting Committee: C14.11 - Optical Properties

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C1649 − 14
Standard Practice for
Instrumental Transmittance Measurement of Color for Flat
1
Glass, Coated and Uncoated
This standard is issued under the fixed designation C1649; 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.
3
1. Scope 2.2 CIE Standard:
CIE 15:2004 Colorimetry
1.1 This practice provides guidelines for the instrumental
transmittancemeasurementofthecolorofcoatedanduncoated
3. Summary of Practice
transparent glass. See Terminology E284.
3.1 The color of transparent glass is measured in the total
1.2 The practice specifically excludes fluorescent and iri-
transmittance mode on a CIE-conforming diffuse instrument.
descent samples.
(See Guide E179 and Test Method E1348.) The glass color is
expressed in CIE tristimulus values based on spectral transmit-
1.3 The values stated in SI units are to be regarded as the
tance measurements over the full CIE spectral range of 350 –
standard. The values given in parentheses are for information
780 nm with a maximum 10-nm band pass. (See CIE 15:2004
only.
and Practice E308.) For color measurement, use of a truncated
1.4 This standard does not purport to address all of the
spectral range of 400 – 700 nm is acceptable. (See CIE
safety concerns, if any, associated with its use. It is the
15:2004.) Further information on the UV absorbing character-
responsibility of the user of this standard to establish appro-
istics of the glass or glass coating, or both, may be determined
priate safety and health practices and determine the applica-
by examining the spectral data in the 350 – 400 nm range. If
bility of regulatory limitations prior to use.
the instrument allows spectral measurement above 700 nm,
useful information on the IR transmittance characteristics of
2. Referenced Documents
the glass or glass coating may also be determined. If coatings
2
are present, they are assumed to reflect and partially transmit
2.1 ASTM Standards:
light.
D2244 Practice for Calculation of Color Tolerances and
Color Differences from Instrumentally Measured Color
4. Significance and Use
Coordinates
4.1 Color measurement quantifies the transmitted color for
E284 Terminology of Appearance
glass.Theuserdefinesanacceptablerangeofcolorappropriate
E179 Guide for Selection of Geometric Conditions for
for the end use. A typical quality concern for transmittance
Measurement of Reflection and Transmission Properties
color measurement of glass products is verification of lot-to-lot
of Materials
color consistency for end-user acceptance.
E308 PracticeforComputingtheColorsofObjectsbyUsing
the CIE System
4.2 If the transmitted color of a glass product is consistent
E1164 PracticeforObtainingSpectrometricDataforObject-
from lot-to-lot and within agreed supplier-buyer acceptance
Color Evaluation
criteria, the product’s color is expected to be consistent and
E1348 Test Method for Transmittance and Color by Spec-
acceptable for end-use.
trophotometry Using Hemispherical Geometry
5. Apparatus
5.1 For color measurements, a CIE-conforming diffuse
1
This practice is under the jurisdiction of ASTM Committee C14 on Glass and
sphere instrument capable of making transmission measure-
Glass Products and is the direct responsibility of Subcommittee C14.11 on Optical
ments in the total transmittance mode is required.
Properties.
Current edition approved May 1, 2014. Published May 2014. Originally
5.2 Inaddition,adeviceformountingtheglasssampleflush
approved in 2008. Last previous edition approved in 2008 as C1649 – 08. DOI:
at the transmission port is required.
10.1520/C1649-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from CIE, Commission Internationale de L’Eclairage, Wien,Austria,
the ASTM website. www.cie.co.at.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1649 − 14
5.3 The instrument and associated color quality software/ 9.2 At a minimum, scan the sample over the range of
firmware shall be capable of converting measured spectral wavelengths required for measurement. Two scans with a 90º
transmittance data to CIE L*, a* b*; Hunter L, a, b; or Y, x, y rotation of the samples are preferable. If practical and possible,
values calculated for CIE illuminant D65 and the CIE 1964 10 scan at least one other area of the sample as well.
degree standard observer. (See Practice E1164
...

This document is not an ASTM 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. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1649 − 08 C1649 − 14
Standard Practice for
Instrumental Transmittance Measurement of Color for Flat
1
Glass, Coated and Uncoated
This standard is issued under the fixed designation C1649; 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
1.1 This practice provides guidelines for the instrumental transmittance measurement of the color of coated and uncoated
transparent glass. 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 the standard. The values given in parentheses are for information only.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
E284 Terminology of Appearance
E179 Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
E308 Practice for Computing the Colors of Objects by Using the CIE System
E1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation
E1348 Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry
3
2.2 CIE Standard:
CIE 15:2004 Colorimetry
3. Summary of Practice
3.1 The color of transparent glass is measured in the total transmittance mode on a CIE-conforming diffuse instrument. (See
Guide E179 and Test Method E1348.) The glass color is expressed in CIE tristimulus values based on spectral transmittance
measurements over the full CIE spectral range of 350 – 780 nm with a maximum 10-nm band pass. (See CIE 15:2004 and Practice
E308.) For color measurement, use of a truncated spectral range of 400 – 700 nm is acceptable. (See CIE 15:2004.) Further
information on the UV absorbing characteristics of the glass or glass coating, or both, may be determined by examining the spectral
data in the 350 -– 400 nm range. If the instrument allows spectral measurement above 700 nm, useful information on the IR
transmittance characteristics of the glass or glass coating may also be determined. If coatings are present, they are assumed to
reflect and partially transmit light.
4. Significance and Use
4.1 Color measurement quantifies the transmitted color for glass. The user defines an acceptable range of color appropriate for
the end use. A typical quality concern for transmittance color measurement of glass products is verification of lot-to-lot color
consistency for end-user acceptance.
1
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
Properties.
Current edition approved Jan. 1, 2008May 1, 2014. Published January 2008May 2014. Originally approved in 2008. Last previous edition approved in 2008 as C1649 –
08. DOI: 10.1520/C1649-08.10.1520/C1649-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available 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 L’Eclairage, Wien, Austria, www.cie.co.at.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1649 − 14
4.2 If the transmitted color of a glass product is consistent from lot-to-lot and within agreed supplier-buyer acceptance criteria,
the product’s color is expected to be consistent and acceptable for end-use.
5. Apparatus
5.1 For color measurements, a CIE-conforming diffuse sphere instrument capable of making transmission measurements in the
total transmittance mode is required.
5.2 In addition, a device for mounting the glass sample flush at the tr
...