ASTM D6290-13
(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, make reference should be made 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 col...
SCOPE
1.1 This test method is intended primarily 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, CIE X, Y, Z, and Hunter L, a, b, or CIE L*, a*, b*.
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.Note 1—There is no known ISO equivalent to this standard.
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Designation: D6290 − 13
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* E313 Practice for Calculating Yellowness and Whiteness
Indices from Instrumentally Measured Color Coordinates
1.1 This test method is intended primarily for the instru-
E691 Practice for Conducting an Interlaboratory Study to
mental measurement of the degree of yellowness (or change of
Determine the Precision of a Test Method
degree of yellowness) under daylight illumination of
E1331 Test Method for Reflectance Factor and Color by
homogeneous, nonfluorescent, nearly-colorless transparent or
Spectrophotometry Using Hemispherical Geometry
nearly-white translucent or opaque plastics. The measurement
E1347 Test Method for Color and Color-Difference Mea-
is made on pellets and based on tristimulus values obtained
surement by Tristimulus Colorimetry
with a spectrophotometer or colorimeter.
E1349 Test Method for Reflectance Factor and Color by
1.2 This test method is applicable to the color analysis of
Spectrophotometry Using Bidirectional (45°:0° or 0°:45°)
plastic pellets. It is possible that each material will have unique
Geometry
characteristics that determine the color values.
3. Terminology
1.3 This procedure outlines a method to determine color
3.1 Definitions—RefertoTerminologiesD883andE284for
measurements, such as Yellowness Index, CIE X, Y, Z, and
definitions of terms used in this test method.
Hunter L, a, b, or CIE L*, a*, b*.
1.4 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 Beforeproceedingwiththistestmethod,makereference
responsibility of the user of this standard to establish appro-
shouldbemadetothespecificationofthematerialbeingtested.
priate safety and health practices and determine the applica-
Any test specimen preparation, conditioning, dimensions, or
bility of regulatory limitations prior to use.
testing parameters, or a combination thereof, covered in the
NOTE 1—There is no known ISO equivalent to this standard.
materials specification shall take precedence over those men-
tioned in this test method. If there are no material
2. Referenced Documents
specifications, then default conditions apply.
2
2.1 ASTM Standards:
NOTE 2—Some materials, such as polyamide (nylon), can be cooled
D883 Terminology Relating to Plastics
very differently during the production of the pellets. This variation in the
D2244 Practice for Calculation of Color Tolerances and cooling of the pellets can result in different levels of crystallinity in the
pellets only. More crystalline nylons will be more opaque than amorphous
Color Differences from Instrumentally Measured Color
nylons. This will result in differences in pellet opacity. The pellet shape is
Coordinates
independent of the crystallinity of the material. This variation in pellet
E179 Guide for Selection of Geometric Conditions for
appearance, due to varying levels of crystallinity, does not affect final
Measurement of Reflection and Transmission Properties
properties.
of Materials NOTE 3—This test method should not be used for general material
specifications.
E284 Terminology of Appearance
E308 PracticeforComputingtheColorsofObjectsbyUsing
4.2 This test method describes a technique useful for mak-
the CIE System ing 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
1
compare specimens of similar pellet shape, size, texture, and
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.40 on Optical Properties.
degree of translucency. For example, compare translucent
Current edition approved Nov. 1, 2013. Published November 2013. Originally
disc-shaped pellets to translucent disc-shaped pellets, not with
ε1
approved in 1998. Last previous edition approved in 2005 as D6290 - 05 . DOI:
opaque, rectangular shaped pellets.
10.1520/D6290-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.3 Exact measurements of resin pellet color are not neces-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
sarily directly related to the color of the final cast, molded or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. extruded product due to the multitude of variables, such as
*A Summa
...
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.
´1
Designation: D6290 − 05 D6290 − 13
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
ε NOTE—Added research report information to Section 10 editorially in September 2010.
1. Scope*
1.1 This test method is intended primarily 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. Each material mayIt 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, CIE X, Y, Z, and Hunter L,
a, b, or CIE L*, a*, b*.
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.
NOTE 1—There is no equivalent ISO Standard.known ISO equivalent to this standard.
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
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
3. Terminology
3.1 Definitions— Refer to Terminologies D883 and E284 for definitions of terms used in this test method.
4. Significance and Use
4.1 Before proceeding with this test method, make reference should be made 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
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 April 1, 2005Nov. 1, 2013. Published June 2005November 2013. Originally approved in 1998. Last previous edition approved in 19982005 as
ε1
D6290 - 98D6290 - 05 . DOI: 10.1520/D6290-05E01.10.1520/D6290-13.
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
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D6290 − 13
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 fina
...
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