ASTM D3724-01(2007)
(Specification)Standard Specification for Synthetic Brown Iron Oxide Pigment
Standard Specification for Synthetic Brown Iron Oxide Pigment
ABSTRACT
This specification establishes the properties and requirements for the pigments commercially known as synthetic pure brown iron oxides and its blends, suitable for use in paints and coatings. The pigment, which shall be soft, dry, and finely pulverized, may be manufactured by either of the following methods: precipitation of iron salts; calcination of precipitated iron oxides; blends of synthetic red, yellow, and black iron oxides; and blends of synthetic red, yellow, and black iron oxides plus the addition of carbon black. Specimens shall be suitably sampled and tested, and shall adhere to specified requirements as to total iron oxide, ferrous iron, carbon black, moisture and other volatile matter, organic coloring matter, total sulfates, coarse particles (total residue retained on No. 325 sieve), and water-soluble matter.
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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Designation:D3724 −01(Reapproved2007)
StandardSpecification for
Synthetic Brown Iron Oxide Pigment
This standard is issued under the fixed designation D3724; 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 E351 Test Methods for ChemicalAnalysis of Cast Iron—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
of manufacture are: 3.1 The pigment shall be a manufactured iron oxide or a
1.1.1 Precipitation of iron salts. blend. It shall be a soft dry finely pulverized pigment and shall
1.1.2 Calcination of precipitated iron oxides. conform to the following requirements:
1.1.3 Blends of synthetic red, yellow, and black iron oxides.
FeO 0to10%
Fe O 83 to 98 %
1.1.4 Blends of synthetic red, yellow, and black iron oxides 2 3
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 %
Small amounts of carbon black are added to obtain tinting
Organic coloring matter none
Total sulfates expressed as SO , max, % 2.0 %
colors not obtainable when synthetic brown iron oxide or 3
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
3.2 Inasmuchassyntheticbrownironoxidesareavailablein
standard. The values given in parentheses are for information
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 standard acceptable to both the purchaser and the seller when
2.1 ASTM Standards:
tested by Test Method D387.
D50 Test Methods for ChemicalAnalysis ofYellow, Orange,
Red, and Brown Pigments Containing Iron and Manga-
4. Sampling
nese
D185 Test Methods for Coarse Particles in Pigments 4.1 Two samples shall be taken at random from different
packages from each lot, batch, day’s pack, or other unit of
D280 Test Methods for Hygroscopic Moisture (and Other
Matter Volatile Under the Test Conditions) in Pigments production in a shipment. When no markings distinguishing
between units of production appear, samples shall be taken
D387 Test Method for Color and Strength of Chromatic
Pigments with a Mechanical Muller from different packages in the ratio of two samples for each
4540 kg or 10 000 lb, except that for shipments of less than
D1208 Test Methods for Common Properties of Certain
Pigments 10 000 lb, two samples shall be taken. At the option of the
purchaser, the samples may be tested separately or after
D3872 Test Method for Ferrous Iron in Iron Oxides
E350 Test Methods for Che
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This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
e1
Designation:D3724–82(Reapproved 1995) Designation: D 3724 – 01 (Reapproved 2007)
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
1.1 Thisspecificationcoversthepigmentscommerciallyknownassyntheticpurebrownironoxidesandblends.Thesepigments
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.
2. Referenced Documents
2.1 ASTM Standards:
D 50 Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and Manganese
D 185Test Methods for Coarse Particles in Pigments, Pastes, and Paints Test Methods for Coarse Particles in Pigments
D 280 Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
D 387 Test Method for Color and Strength of ColorChromatic Pigments with a Mechanical Muller
D 1208 Test Methods for Common Properties of Certain Pigments
D 3872 Test Method for Ferrous Iron in Iron Oxides
E 350 Test Methods for ChemicalAnalysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought
Iron
E 351 Test Methods for Chemical Analysis of Cast Iron—AllIronAll Types
3. Composition and Properties
3.1 Thepigmentshallbeamanufacturedironoxideorablend.Itshallbeasoftdryfinelypulverizedpigmentandshallconform
to the following requirements:
FeO 0to10%
Fe O 83 to 98 %
2 3
Carbon black, max, % 5.0 %
Moisture and other volatile matter, max, % 1.0 %
Organic coloring matter none
Total sulfates expressed as SO , max, % 2.0 %
Coarse particles (total residue retained on No. 1.0 %
325 (45-µm) mesh sieve, max, %
Matter soluble in water, max, % 0.5 %
3.2 Inasmuch as synthetic brown iron oxides are available in a wide range of shades. The mass color and character of the tint
and the tinting strength formed by a mixture with a white pigment shall be within mutually agreed upon limits of a standard
acceptable to both the purchaser and the seller when tested by Test Method D 387.
This specification is under the jurisdiction of ASTM Committee D-1D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility o
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