ASTM D7133-11

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

SIGNIFICANCE AND USE
CIELAB is a visual-based scale that can be used to specify color and set color tolerances for the polyurethane industry.
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 can be used to set tolerances for appropriate polyurethane raw materials.
This test method does not include provisions for materials with fluorescence or visible haze (usually greater than 5 % haze).
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 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.
Note 1—There is no known ISO equivalent to this standard.

General Information

• Status: Historical
• Publication Date: 31-Jan-2011
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

Relations

• Replaces: ASTM D7133-05 - Standard Test Method for Polyurethane Raw Materials: Instrumental Measurement of Tristimulus CIELAB Color and Yellowness Index of Liquids
• Effective Date: 01-Feb-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7133 − 11
StandardTest 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* 3. Terminology
3.1 Definitions—For definitions of terms that appear in this
1.1 This test method provides an instrumental method for
test method, refer to Terminologies E284, D883, and the
measuring the CIELAB color and Yellowness Index (YI) of
terminology section of Practice E308.
liquid polyurethane raw materials.The CIELAB andYI results
arederivedfrommathematicalmanipulationofCIEtristimulus
4. Summary of Test Method
values in accordance with Practices E308 and E313, respec-
4.1 The color of the total transmitted light is measured by a
tively.
spectrophotometer in CIE tristimulus values under CIE stan-
1.2 This standard does not purport to address all of the
dard illuminant D65 and CIE 1964 supplementary standard
safety concerns, if any, associated with its use. It is the
observer commonly called the 10° standard observer. These
responsibility of the user of this standard to establish appro-
values are then converted by the appropriate equations to the
priate safety and health practices and determine the applica-
CIELAB color scale and theYellowness Index. L*a*b* andYI
bility of regulatory limitations prior to use.
values are reported.
NOTE 1—There is no known ISO equivalent to this standard.
5. Significance and Use
5.1 CIELAB is a visual-based scale that can be used to
2. Referenced Documents
specify color and set color tolerances for the polyurethane
2
2.1 ASTM Standards:
industry.
D883 Terminology Relating to Plastics
5.2 Yellowness Index specifies the degree of departure of
D1193 Specification for Reagent Water
the sample from colorless towards yellow. This index is only
E180 Practice for Determining the Precision of ASTM
suitable for clear liquids with degrees of saturation in yellow
Methods for Analysis and Testing of Industrial and Spe-
(dominant transmission wavelength in the 570 to 580 nm
3
cialty Chemicals (Withdrawn 2009)
range). It can be used to set tolerances for appropriate
E284 Terminology of Appearance
polyurethane raw materials.
E308 PracticeforComputingtheColorsofObjectsbyUsing
5.3 This test method does not include provisions for mate-
the CIE System
rialswithfluorescenceorvisiblehaze(usuallygreaterthan5 %
E313 Practice for Calculating Yellowness and Whiteness
haze).
Indices from Instrumentally Measured Color Coordinates
5.4 Beforeproceedingwiththistestmethod,makereference
E691 Practice for Conducting an Interlaboratory Study to
to the specification of the material being tested. Any test
Determine the Precision of a Test Method
specimen preparation, conditioning, dimensions, or testing
parameters or combination thereof, covered in the materials
specificationshalltakeprecedenceoverthosementionedinthis
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
test method. If there are no material specifications, then the
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials -
default conditions apply.
Plastics and Elastomers.
Current edition approved Feb. 1, 2011. Published February 2011. Originally
approved in 2005. Last previous edition approved in 2005 as D7133 - 05.
6. Interferences
DOI:10.1520/D7133–11.
2
6.1 This test method is to be used to compare samples only
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
when they are measured under the same conditions.
Standards volume information, refer to the standard’s Document Summary page on
6.1.1 The medium in the cuvette used during standardiza-
the ASTM website.
3
tion of the instrument will have an effect on the measured
The last approved version of this historical standard is referenced on
www.astm.org. results. Light mineral oil is recommended, however, distilled
*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

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D7133 − 11
water can be used as a substitute but a note of the substitution measuring samples (if not the same cuvette) must be matched.
must be included in any report of the results. This can be determined by proving that the variation, if any, in
6.1.2 The temperature of the sample is also expected to the different cuve
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:D7133–05 Designation:D7133–11
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.
1.2See Section 5 for cautions in using this test method.
1.31.2 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.
NOTE1—There is no equivalent ISO standard. 1—There is no known ISO equivalent to this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
D1193 Specification for Reagent Water
E180 Practice for Determining the Precision ofASTM Methods forAnalysis andTesting of Industrial and Specialty Chemicals
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
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
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.
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 can be 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 can be
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
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular Materials—Plastics
and Elastomers.
Current edition approved Dec. 15, 2005. Published January 2006. DOI: 10.1520/D7133-05.on Cellular Materials - Plastics and Elastomers.
Current edition approved Feb. 1, 2011. Published February 2011. Originally approved in 2005. Last previous edition approved in 2005 as D7133 - 05. DOI:10.1520/
D7133–11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
*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 ----------------------
D7133–11
take precedence over those mentioned in this test method. If there are no material specifications, then the default conditions apply.
6. Interferences
6.1 This test method is to be used to compare samples only when they are measured under the same conditions.
6.1.1 Themediuminthecuvetteusedduringstandar
...