ASTM D3724-82(1995)e1
(Specification)Standard Specification for Synthetic Brown Iron Oxide Pigment
Standard Specification for Synthetic Brown Iron Oxide Pigment
SCOPE
1.1 This specification covers the pigments commercially known as synthetic pure brown iron oxides and blends. These pigments are suitable for use in paints and coatings. Methods of manufacture are:
1.1.1 Precipitation of iron salts.
1.1.2 Calcination of precipitated iron oxides.
1.1.3 Blends of synthetic red, yellow, and black iron oxides.
1.1.4 Blends of synthetic red, yellow, and black iron oxides plus the addition of carbon black to a maximum of 5.0 %. Small amounts of carbon black are added to obtain tinting colors not obtainable when synthetic brown iron oxide or carbon black are used singly.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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e1
Designation: D 3724 – 82 (Reapproved 1995)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Synthetic Brown Iron Oxide Pigment
This standard is issued under the fixed designation D 3724; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Keywords were added editorially in May 1995.
1. Scope blend. It shall be a soft dry finely pulverized pigment and shall
conform to the following requirements:
1.1 This specification covers the pigments commercially
FeO 0to10%
known as synthetic pure brown iron oxides and blends. These
Fe O 83 to 98 %
2 3
pigments are suitable for use in paints and coatings. Methods
Carbon black, max, % 5.0 %
of manufacture are:
Moisture and other volatile matter, max, % 1.0 %
Organic coloring matter none
1.1.1 Precipitation of iron salts.
Total sulfates expressed as SO , max, % 2.0 %
1.1.2 Calcination of precipitated iron oxides.
Coarse particles (total residue retained on No. 1.0 %
1.1.3 Blends of synthetic red, yellow, and black iron oxides. 325 (45-μm) mesh sieve, max, %
Matter soluble in water, max, % 0.5 %
1.1.4 Blends of synthetic red, yellow, and black iron oxides
plus the addition of carbon black to a maximum of 5.0 %.
3.2 Inasmuch as synthetic brown iron oxides are available in
Small amounts of carbon black are added to obtain tinting
a wide range of shades. The mass color and character of the tint
colors not obtainable when synthetic brown iron oxide or
and the tinting strength formed by a mixture with a white
carbon black are used singly.
pigment shall be within mutually agreed upon limits of a
standard acceptable to both the purchaser and the seller when
2. Referenced Documents
tested by Test Method D 387.
2.1 ASTM Standards:
4. Sampling
D 50 Test Methods for Chemical Analysis of Yellow, Or-
ange, Red, and Brown Pigments Containing Iron and
4.1 Two samples shall be taken at random from different
Manganese
packages from each lot, batch, day’s pack, or other unit of
D 185 Test Methods for Coarse Particles in Pigments,
production in a shipment. When no markings distinguishing
Pastes, and Paints
between units of production appear, samples shall be taken
D 280 Test Methods for Hygroscopic Moisture (and Other
from different packages in the ratio of two samples for each 5
Matter Volatile Under the Test Conditions) in Pigments
tons (inch-pound or SI), except that for shipments of less than
D 387 Test Method for Color and Strength of Color Pig-
10 000 lb t
...
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