ASTM D478-02(2019)

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:D478 −02 (Reapproved 2019)
Standard Specification for
Zinc Yellow (Zinc Chromate) Pigments
This standard is issued under the fixed designation D478; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 4. Composition and Properties
1.1 This specification covers the pigments commercially
4.1 Dry Pigment—The pigment shall be a reaction precipi-
known as zinc yellow (zinc chromate).
tate of soluble chromates and a suitable zinc compound and
shall be free of extenders, carbonates, and organic color in any
1.2 Two types are included:
form. The pigment shall conform to the requirements for
1.2.1 Type I—High-purity, low sulfate and chloride content.
composition prescribed in Table 1.
1.2.2 Type II—Regular grade.
1.3 The values stated in SI units are to be regarded as
4.2 The mass color and character of the tint and the tinting
standard. The values given in parentheses are for information
strength formed by a mixture with a white pigment shall be
only.
within mutually agreed upon limits of a standard acceptable to
both the purchaser and the seller.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Sampling
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.1 Two samples shall be taken at random from different
mendations issued by the World Trade Organization Technical
packages from each lot, batch, day’s pack, or other unit of
Barriers to Trade (TBT) Committee.
production in a shipment. When no markings distinguishing
between units of production appear, samples shall be taken
2. Referenced Documents
2 from different packages in the ratio of two samples for each
2.1 ASTM Standards:
4545 kg (10 000 lb), except that for shipments of less than
D185 Test Methods for Coarse Particles in Pigments
10 000 lb two samples shall be taken. At the option of the
D387 Test Method for Color and Strength of Chromatic
purchaser, the samples may be tested separately or after
Pigments with a Mechanical Muller
blending in equal quantities the samples from the same
D444 Test Methods for Chemical Analysis of Zinc Yellow
production unit to form a composite sample.
Pigment (Zinc Chromate Yellow)
3. Significance and Use
6. Test Methods
3.1 Zinc yellow is used in rust-inhibiting protective coatings
6.1 Tests shall be conducted in accordance with the follow-
and metal primers for ferrous and non-ferrous metals.
ing ASTM test methods:
6.2 Chemical Analysis—Test Methods D444.
This specification is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.3 Coarse Particles—Test Methods D185.
Subcommittee D01.31 on Pigm
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