ASTM D7133-21

Standard Test Method for Polyurethane Raw Materials: Instrumental Measurement of Tristimulus CIELAB Color and Yellowness Index of Liquids

SIGNIFICANCE AND USE
5.1 CIELAB is a visual-based scale that is used to specify color and set color tolerances for the polyurethane industry.  
5.2 Yellowness Index specifies the degree of departure of the sample from colorless towards yellow. This index is only suitable for clear liquids with degrees of saturation in yellow (dominant transmission wavelength in the 570 to 580 nm range). It is used to set tolerances for appropriate polyurethane raw materials.  
5.3 This test method does not include provisions for materials with fluorescence or visible haze (usually greater than 5 % haze).  
5.4 Before proceeding with this test method, make reference to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters or combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then the default conditions apply.
SCOPE
1.1 This test method provides an instrumental method for measuring the CIELAB color and Yellowness Index (YI) of liquid polyurethane raw materials. The CIELAB and YI results are derived from mathematical manipulation of CIE tristimulus values in accordance with Practices E308 and E313, respectively.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions provided for information only and are not considered standard.  
1.3 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.
Note 1: There is no known ISO equivalent to this standard.  
1.4 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.

General Information

• Status: Published
• Publication Date: 30-Sep-2021
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

Standards Content (Sample)

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.
Designation: D7133 − 21
Standard Test Method for
Polyurethane Raw Materials: Instrumental Measurement of
1
Tristimulus CIELAB Color and Yellowness Index of Liquids
This standard is issued under the fixed designation D7133; 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* cialty Chemicals (Withdrawn 2009)
E284 Terminology of Appearance
1.1 This test method provides an instrumental method for
E308 PracticeforComputingtheColorsofObjectsbyUsing
measuring the CIELAB color and Yellowness Index (YI) of
the CIE System
liquid polyurethane raw materials.The CIELAB andYI results
E313 Practice for Calculating Yellowness and Whiteness
arederivedfrommathematicalmanipulationofCIEtristimulus
Indices from Instrumentally Measured Color Coordinates
values in accordance with Practices E308 and E313, respec-
E456 Terminology Relating to Quality and Statistics
tively.
E691 Practice for Conducting an Interlaboratory Study to
1.2 The values stated in SI units are to be regarded as
Determine the Precision of a Test Method
standard. The values given in parentheses are mathematical
E2935 Practice for Evaluating Equivalence of Two Testing
conversions provided for information only and are not consid-
Processes
ered standard.
3. Terminology
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms that appear in this
responsibility of the user of this standard to establish appro-
test method, refer to Terminologies E284, D883, and the
priate safety, health, and environmental practices and deter-
terminology section of Practice E308. For terms relating to
mine the applicability of regulatory limitations prior to use.
precision and bias and associated issues, the terms used in this
standard are defined in accordance with Terminology E456.
NOTE 1—There is no known ISO equivalent to this standard.
1.4 This international standard was developed in accor-
4. Summary of Test Method
dance with internationally recognized principles on standard-
4.1 The color of the total transmitted light is measured by a
ization established in the Decision on Principles for the
spectrophotometer in CIE tristimulus values under CIE stan-
Development of International Standards, Guides and Recom-
dard illuminant D65 and CIE 1964 supplementary standard
mendations issued by the World Trade Organization Technical
observer commonly called the 10° standard observer. These
Barriers to Trade (TBT) Committee.
values are then converted by the appropriate equations to the
CIELAB color scale and theYellowness Index. L*a*b* andYI
2. Referenced Documents
values are reported.
2
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
5. Significance and Use
D1193 Specification for Reagent Water
5.1 CIELAB is a visual-based scale that is used to specify
E180 Practice for Determining the Precision of ASTM
color and set color tolerances for the polyurethane industry.
Methods for Analysis and Testing of Industrial and Spe-
5.2 Yellowness Index specifies the degree of departure of
the sample from colorless towards yellow. This index is only
1
suitable for clear liquids with degrees of saturation in yellow
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials -
(dominant transmission wavelength in the 570 to 580 nm
Plastics and Elastomers.
range). It is used to set tolerances for appropriate polyurethane
Current edition approved Oct. 1, 2021. Published October 2021. Originally
raw materials.
approved in 2005. Last previous edition approved in 2016 as D7133 - 16.
DOI:10.1520/D7133-21.
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 The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7133 − 21
5.3 This test method does not include provisions for mate- methods, even when conducted rapidly, can cause contamina-
rialswithfluorescenceorvisiblehaze(usuallygreat
...

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: D7133 − 16 D7133 − 21
Standard Test Method for
Polyurethane Raw Materials: Instrumental Measurement of
1
Tristimulus CIELAB Color and Yellowness Index of Liquids
This standard is issued under the fixed designation D7133; 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 test method provides an instrumental method for measuring the CIELAB color and Yellowness Index (YI) of liquid
polyurethane raw materials. The CIELAB and YI results are derived from mathematical manipulation of CIE tristimulus values
in accordance with Practices E308 and E313, respectively.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to
inch-pound units that are provided for information only and are not considered standard.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
D1193 Specification for Reagent Water
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
3
(Withdrawn 2009)
E284 Terminology of Appearance
E308 Practice for Computing the Colors of Objects by Using the CIE System
E313 Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2935 Practice for Evaluating Equivalence of Two Testing Processes
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular Materials - Plastics
and Elastomers.
Current edition approved Sept. 1, 2016Oct. 1, 2021. Published September 2016October 2021. Originally approved in 2005. Last previous edition approved in 20112016
as D7133 - 11.D7133 - 16. DOI:10.1520/D7133-16.DOI:10.1520/D7133-21.
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
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7133 − 21
3. Terminology
3.1 Definitions—For definitions of terms that appear in this test method, refer to Terminologies E284, D883, and the terminology
section of Practice E308. For terms relating to precision and bias and associated issues, the terms used in this standard are defined
in accordance with Terminology E456.
4. Summary of Test Method
4.1 The color of the total transmitted light is measured by a spectrophotometer in CIE tristimulus values under CIE standard
illuminant D65 and CIE 1964 supplementary standard observer commonly called the 10° standard observer. These values are then
converted by the appropriate equations to the CIELAB color scale and the Yellowness Index. L*a*b* and YI values are reported.
5. Significance and Use
5.1 CIELAB is a visual-based scale that is used to specify color and set color tolerances for the polyurethane industry.
5.2 Yellowness Index specifies the degree of departure of the sample from colorless towards yellow. This index is only suitable
for clear liquids with degrees of saturation in yellow (dominant transmission wavelength in the 570 to 580 nm range
...