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ASTM D6290-05

(Test Method)

Standard Test Method for Color Determination of Plastic Pellets

Standard Test Method for Color Determination of Plastic Pellets

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 may 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.

General Information

Status
Historical
Publication Date
31-Mar-2005
ICS
17.180.20 - Colours and measurement of light
83.080.01 - Plastics in general
Technical Committee
D20 - Plastics
Drafting Committee
D20.40 - Optical Properties
Current Stage
Ref Project

Relations

Replaces
ASTM D6290-98e1 - Standard Test Method for Color Determination of Plastic Pellets
Effective Date
01-Apr-2005
Replaced By
ASTM D6290-05e1 - Standard Test Method for Color Determination of Plastic Pellets
Effective Date
01-Apr-2005
Referred By
ASTM D7711-23 - Standard Guide for Description of Polymer Pellet Defects
Effective Date
01-Apr-2005
Referred By
ASTM D4101-17e1 - Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
Effective Date
01-Apr-2005

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ASTM D6290-05 - Standard Test Method for Color Determination of Plastic PelletsASTM D6290-05 - Standard Test Method for Color Determination of Plastic Pellets
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ASTM D6290-05 - Standard Test Method for Color Determination of Plastic Pellets
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6290–05
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* E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method is intended primarily for the instru-
E1331 Test Method for Reflectance Factor and Color by
mental measurement of the degree of yellowness (or change of
Spectrophotometry Using Hemispherical Geometry
degree of yellowness) under daylight illumination of homoge-
E1347 Test Method for Color and Color-Difference Mea-
neous, nonfluorescent, nearly-colorless transparent or nearly-
surement by Tristimulus Colorimetry
white translucent or opaque plastics.The measurement is made
E1349 Test Method for Reflectance Factor and Color by
on pellets and based on tristimulus values obtained with a
Spectrophotometry Using Bidirectional (45°:0° or 0°:45°)
spectrophotometer or colorimeter.
Geometry
1.2 This test method is applicable to the color analysis of
plastic pellets. Each material may have unique characteristics
3. Terminology
that determine the color values.
3.1 Definitions— Refer to Terminologies D883 and E284
1.3 This procedure outlines a method to determine color
for definitions of terms used in this test method.
measurements, such as Yellowness Index, CIE X, Y, Z, and
Hunter L, a, b, or CIE L*, a*, b*.
4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 Before proceeding with this test method, reference
safety concerns, if any, associated with its use. It is the
shouldbemadetothespecificationofthematerialbeingtested.
responsibility of the user of this standard to establish appro-
Any test specimen preparation, conditioning, dimensions, or
priate safety and health practices and determine the applica-
testing parameters, or a combination thereof, covered in the
bility of regulatory limitations prior to use.
materials specification shall take precedence over those men-
NOTE 1—There is no equivalent ISO Standard.
tioned in this test method. If there are no material specifica-
tions, then default conditions apply.
2. Referenced Documents
2 NOTE 2—Some materials, such as polyamide (nylon), can be cooled
2.1 ASTM Standards:
very differently during the production of the pellets. This variation in the
D883 Terminology Relating to Plastics
cooling of the pellets can result in different levels of crystallinity in the
D2244 Practice for Calculation of Color Tolerances and
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
appearance, due to varying levels of crystallinity, does not affect final
E179 Guide for Selection of Geometric Conditions for
properties.
Measurement of Reflection and Transmission Properties of
NOTE 3—This test method should not be used for general material
Materials
specifications.
E284 Terminology of Appearance
4.2 This test method describes a technique useful for mak-
E308 Practice for Computing the Colors of Objects by
ing color comparisons of resins in pellet form that is fast and
Using the CIE System
convenient as it does not require preparation, such as molding
E313 Practice for Calculating Yellowness and Whiteness
or extruding specimens. The test method shall be used only to
Indices from Instrumentally Measured Color Coordinates
compare specimens of similar pellet shape, size, texture, and
degree of translucency. For example, translucent disc-shaped
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
pellets should be compared to translucent disc-shaped pellets,
and is the direct responsibility of Subcommittee D20.40 on Optical Properties.
not with opaque, rectangular shaped pellets.
Current edition approved April 1, 2005. Published June 2005. Originally
´1
approved in 1998. Last previous edition approved in 1998 as D6290 - 98 . DOI: 4.3 Exact measurements of resin pellet color may not be
10.1520/D6290-05.
directly related to the color of the final cast, molded or
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
extruded product due to the multitude of variables, such as
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 sectio
...

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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.
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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 ...
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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.  
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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.
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SCOPE
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