ASTM D3724-01(2012)

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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2012
• 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 D3724-01(2007) - Standard Specification for Synthetic Brown Iron Oxide Pigment
• Effective Date: 01-Nov-2012
• Replaced By: ASTM D3724-01(2019) - Standard Specification for Synthetic Brown Iron Oxide Pigment
• Effective Date: 01-Oct-2019
• Referred By: ASTM D4139-04(2020) - Standard Guide for Determining Volatile and Nonvolatile Content of Pigments
• Effective Date: 01-Nov-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D3724 −01(Reapproved 2012)
Standard Specification 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
...