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ASTM D8330-20

(Specification)

Standard Specification for Artists’ Pastels

Standard Specification for Artists’ Pastels

SIGNIFICANCE AND USE
4.1 This specification establishes quality requirements and provides a basis for common understanding among producers, distributors, and users.  
4.2 It is not intended that all pastels meeting the requirements be identical nor of uniform excellence in all respects. Variations in manufacture, not covered by this specification, may cause some artists to prefer one brand to another, either of which may be acceptable under this specification.  
4.3 Variation in test results can be due to differences in pigment manufacture from time to time by a company, different properties of a pigment from company to company, different combinations of pigments and other ingredients, specimen preparation, thickness of pastel on substrate, different instruments and instrumental readings, variations in the surface of the specimen, and the conditions of exposure. Allowance for these variations is made by establishing lightfastness categories that include a range of color differences.  
4.4 Since a specific pastel may be unusually sensitive to some aspect of simulated daylight accelerated lightfastness testing and show a change in color that would not occur in a normal home or gallery environment, two types of exposure are required, both natural daylight and simulated daylight.  
4.5 Some variation in test results is to be expected even when the same type of exposure is repeated. Therefore, after triplicate specimens are exposed in each of the two types of exposures, the lightfastness category of the pastel by each exposure method is based on the mean of the color change of the three specimens, or two specimens if an outlier is discarded.  
4.6 If the two methods place the pastel in the same lightfastness category, the pastel is assigned to that category. If the pastel is placed in different lightfastness categories by the two methods, either the pastel is placed in the poorer of the two categories or a retest is conducted using the test method that yielded the poorer lightfastness c...
SCOPE
1.1 This specification establishes requirements for composition, performance, and labeling of artists' pastels.  
1.2 This specification includes requirements for identification and lightfastness.  
1.3 Pastel specimens are exposed to both natural daylight through window glass and window glass-filtered simulated daylight radiation to determine the lightfastness category for each pastel.  
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.5 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
31-May-2020
ICS
87.040 - Paints and varnishes
97.195 - Items of art and handicrafts. Cultural property and heritage
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.57 - Artist Paints and Related Materials
Current Stage
Ref Project

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ASTM D8330-20 - Standard Specification for Artists’ PastelsASTM D8330-20 - Standard Specification for Artists’ Pastels
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ASTM D8330-20 - Standard Specification for Artists’ Pastels
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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: D8330 −20
Standard Specification for
1
Artists’ Pastels
This standard is issued under the fixed designation D8330; 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 G113 Terminology Relating to Natural andArtificial Weath-
ering Tests of Nonmetallic Materials
1.1 This specification establishes requirements for
G151 Practice for Exposing Nonmetallic Materials inAccel-
composition, performance, and labeling of artists’ pastels.
erated Test Devices that Use Laboratory Light Sources
1.2 This specification includes requirements for identifica-
G155 Practice for Operating XenonArc LightApparatus for
tion and lightfastness.
Exposure of Non-Metallic Materials
1.3 Pastel specimens are exposed to both natural daylight
through window glass and window glass-filtered simulated 3. Terminology
daylight radiation to determine the lightfastness category for
3.1 Definitions:
each pastel.
3.1.1 Refer to Terminology E284 for appearance terms used
1.4 The values stated in SI units are to be regarded as
in this specification and to Terminology G113 for terms
standard. The values given in parentheses after SI units are relating to natural and artificial lightness tests.
provided for information only and are not considered standard.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 pastel, n—a chalk-like stick, varying in hardness from
1.5 This international standard was developed in accor-
hard to soft, composed of minimal binder and colored and
dance with internationally recognized principles on standard-
white pigments for obtaining shades and tints.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3.2.2 substrate, n—white, neutral pH, buffered, uncoated
mendations issued by the World Trade Organization Technical
paper, or board, without optical brighteners, to which pastel is
Barriers to Trade (TBT) Committee.
applied. Some substrates are coated with a gritty layer to aid in
adhesion—these are called sanded pastel papers or boards.
2. Referenced Documents
2
4. Significance and Use
2.1 ASTM Standards:
D1729 Practice for Visual Appraisal of Colors and Color
4.1 This specification establishes quality requirements and
Differences of Diffusely-Illuminated Opaque Materials
provides a basis for common understanding among producers,
D2244 Practice for Calculation of Color Tolerances and
distributors, and users.
Color Differences from Instrumentally Measured Color
4.2 It is not intended that all pastels meeting the require-
Coordinates
ments be identical nor of uniform excellence in all respects.
D4236 Practice for Labeling Art Materials for Chronic
Variations in manufacture, not covered by this specification,
Health Hazards
may cause some artists to prefer one brand to another, either of
D4303 Test Methods for Lightfastness of Colorants Used in
which may be acceptable under this specification.
Artists’ Materials
E284 Terminology of Appearance 4.3 Variation in test results can be due to differences in
G24 Practice for Conducting Exposures to Daylight Filtered pigment manufacture from time to time by a company, differ-
Through Glass ent properties of a pigment from company to company,
different combinations of pigments and other ingredients,
specimenpreparation,thicknessofpastelonsubstrate,different
1
instrumentsandinstrumentalreadings,variationsinthesurface
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
of the specimen, and the conditions of exposure.Allowance for
Subcommittee D01.57 on Artist Paints and Related Materials.
thesevariationsismadebyestablishinglightfastnesscategories
Current edition approved June 1, 2020. Published June 2020. DOI: 10.1520/
that include a range of color differences.
D8330-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.4 Since a specific pastel may be unusually sensitive to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
some aspect of simulated daylight accelerated lightfastness
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. testing and show a change in color that would not occur in a
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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