ASTM D3724-01

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.

General Information

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.31 - Pigment Specifications

Relations

• Replaces: ASTM D3724-82(1995)e1 - Standard Specification for Synthetic Brown Iron Oxide Pigment
• Effective Date: 10-May-2001
• Replaced By: ASTM D3724-01(2007) - Standard Specification for Synthetic Brown Iron Oxide Pigment
• Effective Date: 01-Nov-2007
• Referred By: ASTM D4139-04(2020) - Standard Guide for Determining Volatile and Nonvolatile Content of Pigments
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 3724 – 01
Standard Specification for
1
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.
1. Scope E 351 Test Methods for Chemical Analysis of Cast Iron—
4
All Types
1.1 This specification covers the pigments commercially
known as synthetic pure brown iron oxides and blends. These
3. Composition and Properties
pigments are suitable for use in paints and coatings. Methods
3.1 The pigment shall be a manufactured iron oxide or a
of manufacture are:
blend. It shall be a soft dry finely pulverized pigment and shall
1.1.1 Precipitation of iron salts.
conform to the following requirements:
1.1.2 Calcination of precipitated iron oxides.
FeO 0to10%
1.1.3 Blends of synthetic red, yellow, and black iron oxides.
Fe O 83 to 98 %
2 3
1.1.4 Blends of synthetic red, yellow, and black iron oxides
Carbon black, max, % 5.0 %
plus the addition of carbon black to a maximum of 5.0 %.
Moisture and other volatile matter, max, % 1.0 %
Organic coloring matter none
Small amounts of carbon black are added to obtain tinting
Total sulfates expressed as SO , max, % 2.0 %
3
colors not obtainable when synthetic brown iron oxide or
Coarse particles (total residue retained on No. 1.0 %
carbon black are used singly. 325 (45-µm) mesh sieve, max, %
Matter soluble in water, max, % 0.5 %
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
3.2 Inasmuchassyntheticbrownironoxidesareavailablein
only.
awiderangeofshades.Themasscolorandcharacterofthetint
and the tinting strength formed by a mixture with a white
2. Referenced Documents
pigment shall be within mutually agreed upon limits of a
2.1 ASTM Standards:
standard acceptable to both the purchaser and the seller when
D 50 Test Methods for Chemical Analysis of Yellow, Or-
tested by Test Method D 387.
ange, Red, and Brown Pigments Containing Iron and
2
4. Sampling
Manganese
D 185 Test Methods for Coarse Particles in Pigments,
4.1 Two samples shall be taken at random from different
2
Pastes, and Paints
packages from each lot, batch, day’s pack, or other unit of
D 280 Test Methods for Hygroscopic Moisture (and Other
production in a shipment. When no markings distinguishing
2
Matter Volatile Under the Test Conditions) in Pigments
between units of production appear, samples shall be taken
D 387 Test Method for Color and Strength of Color Pig-
from different packages in the ratio of two samples for each
3
ments with a Mechanical Muller
4540 kg or 10 000 lb, except that for shipments of less than
D 1208 Test Methods for Common Properties of Certain
10 000 lb, two samples shall be taken. At the o
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