ASTM D79-86(2009)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D79 −86(Reapproved 2009) American Association State
Highway and Transportation Officials Standard
AASHTO No.: M124
Standard Specification for
Zinc Oxide Pigments
ThisstandardisissuedunderthefixeddesignationD79;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope Microscopy (Withdrawn 1994)
1.1 This specification covers the pigments commercially
3. Significance and Use
known as “zinc white” or zinc oxide. The pigments may be
3.1 Zinc oxide functions as both a chemical and a pigment.
purchased in the dry form or as a paste in oil.
It is used in a variety of applications including rubber, paint,
NOTE 1—Zinc oxides are used in many industries. For additional
reprography, glass, chemicals, etc. In paint, it contributes to
information, see Classification D4295 and Test Methods D4315 for
mildew protection, ultraviolet absorption, hiding power, and
descriptions of zinc oxide use in rubber compounding.
neutralizationofacidsformeduponoxidationofthepaintfilm.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Composition and Properties
only.
4.1 Dry Pigment, French Process—In the manufacture of
French process zinc oxide, metallic zinc is vaporized, either in
2. Referenced Documents
a boiler or a refining column, and the resulting vapor is burned
2.1 ASTM Standards:
in a controlled manner in an orifice. The fine particles of zinc
D185Test Methods for Coarse Particles in Pigments
oxide are cooled enough to agglomerate and are collected by a
D280Test Methods for Hygroscopic Moisture (and Other
system of fabric bags. French process oxide shall conform to
Matter Volatile Under the Test Conditions) in Pigments
the properties listed in Table 1.
D281Test Method for Oil Absorption of Pigments by
4.2 Dry Pigment,American Process—In the manufacture of
Spatula Rub-out
American process zinc oxide, zinc ore is reduced in the
D332Test Method for Relative Tinting Strength of White
presence of a carbonaceous fuel.The resulting vapor is burned
Pigments by Visual Observation
in a combustion chamber, and the fine particles of zinc oxide
D1483Test Method for Oil Absorption of Pigments by
are cooled enough to agglomerate and are collected by a
Gardner-Coleman Method
systemoffabricbags.Americanprocessoxideshallconformto
D2745Test Method for Relative Tinting Strength of White
the properties listed in Table 1.
Pigments by Reflectance Measurements
D3280Test Methods for Analysis of White Zinc Pigments
4.3 Paste in Oil—The paste shall be made by thoroughly
D4295Classification for Rubber Compounding Materials—
grinding the specified pigment with linseed oil. As received it
Zinc Oxide
shallnotbecakedinthecontainerandshallbreakupreadilyin
D4315Test Methods for Rubber Compounding Material—
oil to form a smooth paint of brushing consistency. The paste
Zinc Oxide
shall conform to the following requirements:
E20Practice for Particle Size Analysis of Particulate Sub-
Pigment, % 80 to 86
stances in the Range of 0.2 to 75 Micrometres by Optical Linseed oil, % 14 to 20
Moisture and other volatile matter, max, % 0.5
Coarse particles and skins (total residue retained on a 1.5
No. 325 (45-µm) sieve), max, % of the dry pigment
This specification is under the jurisdiction ofASTM Committee D01 on Paint
4.4 In such physical properties as are specified by the
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.31 on Pigment Specifications.
purchaser, the pigment shall satisfactorily match a reference
CurrenteditionapprovedJuly1,2009.PublishedJuly2009.Originallyapproved
sample mutually agreed upon by the purchaser and the seller.
in 1921. Last previous edition approved in 2004 a
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