ASTM D6290-19
(Test Method)Standard Test Method for Color Determination of Plastic Pellets
Standard Test Method for Color Determination of Plastic Pellets
SIGNIFICANCE AND USE
4.1 Before proceeding with this test method, refer to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or a combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then default conditions apply.
Note 2: Some materials, such as polyamide (nylon), can be cooled very differently during the production of the pellets. This variation in the cooling of the pellets can result in different levels of crystallinity in the pellets only. More crystalline nylons will be more opaque than amorphous nylons. This will result in differences in pellet opacity. The pellet shape is independent of the crystallinity of the material. This variation in pellet appearance, due to varying levels of crystallinity, does not affect final properties.
Note 3: This test method should not be used for general material specifications.
4.2 This test method describes a technique useful for making color comparisons of resins in pellet form that is fast and convenient as it does not require preparation, such as molding or extruding specimens. The test method shall be used only to compare specimens of similar pellet shape, size, texture, and degree of translucency. For example, compare translucent disc-shaped pellets to translucent disc-shaped pellets, not with opaque, rectangular shaped pellets.
4.3 Exact measurements of resin pellet color are not necessarily directly related to the color of the final cast, molded or extruded product due to the multitude of variables, such as producing variables, methods, and pellet shape and size. Color measurements can be useful for comparing resins in pellet form when all samples are similar in shape and size.
4.4 A three-number tristimulus system is necessary to quantify color completely and precisely. The general method used in this procedure measures color using the CIE ...
SCOPE
1.1 This test method is used for the instrumental measurement of the degree of yellowness (or change of degree of yellowness) under daylight illumination of homogeneous, nonfluorescent, nearly-colorless transparent or nearly-white translucent or opaque plastics. The measurement is made on pellets and based on tristimulus values obtained with a spectrophotometer or colorimeter.
1.2 This test method is applicable to the color analysis of plastic pellets. It is possible that each material will have unique characteristics that determine the color values.
1.3 This procedure outlines a method to determine color measurements, such as Yellowness Index (YI), CIE X, Y, Z, and Hunter L, a, b, or CIE L*, a*, b*.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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: This standard and ISO 17223 address the same subject matter but differ in technical content.
1.6 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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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: D6290 − 19
Standard Test Method for
1
Color Determination of Plastic Pellets
This standard is issued under the fixed designation D6290; 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* D2244 Practice for Calculation of Color Tolerances and
Color Differences from Instrumentally Measured Color
1.1 This test method is used for the instrumental measure-
Coordinates
ment of the degree of yellowness (or change of degree of
E179 Guide for Selection of Geometric Conditions for
yellowness) under daylight illumination of homogeneous,
Measurement of Reflection and Transmission Properties
nonfluorescent, nearly-colorless transparent or nearly-white
of Materials
translucent or opaque plastics. The measurement is made on
E284 Terminology of Appearance
pellets and based on tristimulus values obtained with a spec-
E308 PracticeforComputingtheColorsofObjectsbyUsing
trophotometer or colorimeter.
the CIE System
1.2 This test method is applicable to the color analysis of
E313 Practice for Calculating Yellowness and Whiteness
plasticpellets.Itispossiblethateachmaterialwillhaveunique
Indices from Instrumentally Measured Color Coordinates
characteristics that determine the color values.
E456 Terminology Relating to Quality and Statistics
1.3 This procedure outlines a method to determine color E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
measurements, such as Yellowness Index (YI), CIE X, Y, Z,
and Hunter L, a, b, or CIE L*, a*, b*. E1331 Test Method for Reflectance Factor and Color by
Spectrophotometry Using Hemispherical Geometry
1.4 The values stated in SI units are to be regarded as the
E1347 Test Method for Color and Color-Difference Mea-
standard. The values given in parentheses are for information
surement by Tristimulus Colorimetry
only.
E1349 Test Method for Reflectance Factor and Color by
1.5 This standard does not purport to address all of the
Spectrophotometry Using Bidirectional (45°:0° or 0°:45°)
safety concerns, if any, associated with its use. It is the
Geometry
responsibility of the user of this standard to establish appro-
E2935 Practice for Conducting Equivalence Testing in
priate safety, health, and environmental practices and deter-
Laboratory Applications
mine the applicability of regulatory limitations prior to use.
2.2 ISO/IEC Standards:
NOTE 1—This standard and ISO 17223 address the same subject matter ISO 17223 Plastics Determination of Yellowness Index and
but differ in technical content.
Change in Yellowness Index.
1.6 This international standard was developed in accor- CIEStandardD 001 ColorimetricIlluminantsandObservers
(Disk) (www.cie.co.at)
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3. Terminology
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.1 Definitions—Refer toTerminologies D883 and E284 for
Barriers to Trade (TBT) Committee. definitions of terms used in this test method.
2. Referenced Documents
4. Significance and Use
2
2.1 ASTM Standards:
4.1 Before proceeding with this test method, refer to the
D883 Terminology Relating to Plastics
specification of the material being tested. Any test specimen
preparation,conditioning,dimensions,ortestingparameters,or
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
a combination thereof, covered in the materials specification
and is the direct responsibility of Subcommittee D20.40 on Optical Properties.
shall take precedence over those mentioned in this test method.
Current edition approved June 1, 2019. Published June 2019. Originally
If there are no material specifications, then default conditions
approved in 1998. Last previous edition approved in 2018 as D6290 - 18. DOI:
10.1520/D6290-19.
apply.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NOTE 2—Some materials, such as polyamide (nylon), can be cooled
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 very differently during the production of the pellets. This variation in the
the ASTM website. cooling of the pellets can result in different levels of crystallinity in the
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100
...
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: D6290 − 18 D6290 − 19
Standard Test Method for
1
Color Determination of Plastic Pellets
This standard is issued under the fixed designation D6290; 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 is used for the instrumental measurement of the degree of yellowness (or change of degree of yellowness)
under daylight illumination of homogeneous, nonfluorescent, nearly-colorless transparent or nearly-white translucent or opaque
plastics. The measurement is made on pellets and based on tristimulus values obtained with a spectrophotometer or colorimeter.
1.2 This test method is applicable to the color analysis of plastic pellets. It is possible that each material will have unique
characteristics that determine the color values.
1.3 This procedure outlines a method to determine color measurements, such as Yellowness Index (YI), CIE X, Y, Z, and Hunter
L, a, b, or CIE L*, a*, b*.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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—This standard and ISO 17223 address the same subject matter but differ in technical content.
1.6 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
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
E179 Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
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
E1331 Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry
E1347 Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry
E1349 Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional (45°:0° or 0°:45°) Geometry
E2935 Practice for Conducting Equivalence Testing in Laboratory Applications
2.2 ISO/IEC Standards:
ISO 17223 Plastics Determination of Yellowness Index and Change in Yellowness Index.
CIE Standard D 001 Colorimetric Illuminants and Observers (Disk) (www.cie.co.at)
3. Terminology
3.1 Definitions—Refer to Terminologies D883 and E284 for definitions of terms used in this test method.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.40 on Optical Properties.
Current edition approved Oct. 1, 2018June 1, 2019. Published October 2018June 2019. Originally approved in 1998. Last previous edition approved in 20132018 as
D6290 - 13.D6290 - 18. DOI: 10.1520/D6290-18.10.1520/D6290-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
*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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D6290 − 19
4. Significance and Use
4.1 Before proceeding with this test method, refer to the specification of the material being tested. Any test specimen
preparation, conditioning, dimensions, or testing parameters, or a combination thereof, covered in the materials specification
...
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