ASTM D3721-05(2019)
(Specification)Standard Specification for Synthetic Red Iron Oxide Pigment
Standard Specification for Synthetic Red Iron Oxide Pigment
ABSTRACT
This specification covers synthetic red iron oxide pigment for use in paints and coatings manufactured by any of the following: calcination of iron salts, precipitation from iron salts, calcination of synthetic iron oxide, and product of organic reduction. The pigment shall conform to the requirements prescribed for the following: total iron oxide content, sulfur content, moisture and other volatile matter content, organic coloring matter content, coarse particles in dry pigments (total residue retained), matter soluble in water, and pH value. If the pigments are available in a range of colors, the mass color and the tinting strength or character of the tint formed by mixture with a white pigment shall be within the specified limits. The sampling and test methods to determine conformance of the pigments to the specified properties are given.
SCOPE
1.1 This specification covers synthetic red iron oxide for use in paints and coatings manufactured by any of the following:
1.1.1 Calcination of iron salts.
1.1.2 Precipitation from iron salts.
1.1.3 Calcination of synthetic iron oxide.
1.1.4 Product of organic reduction.
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 30-Apr-2019
- Technical Committee
- D01 - Paint and Related Coatings, Materials, and Applications
- Drafting Committee
- D01.31 - Pigment Specifications
Relations
- Effective Date
- 01-May-2019
- Effective Date
- 01-Jun-2019
- Effective Date
- 01-Nov-2012
- Effective Date
- 01-Nov-2012
- Effective Date
- 01-Jun-2011
- Effective Date
- 01-Feb-2008
- Effective Date
- 01-Jul-2007
- Effective Date
- 01-Jun-2007
- Effective Date
- 01-Feb-2007
- Effective Date
- 01-Sep-2005
- Effective Date
- 10-May-2001
- Effective Date
- 10-May-2001
- Effective Date
- 10-Jun-2000
- Refers
ASTM D185-84(1999) - Standard Test Methods for Coarse Particles in Pigments, Pastes, and Paints - Effective Date
- 10-May-1999
- Effective Date
- 10-May-1999
Overview
ASTM D3721-05(2019) is the official international standard specification developed by ASTM International for synthetic red iron oxide pigment. This standard covers pigments produced by various methods, including:
- Calcination of iron salts
- Precipitation from iron salts
- Calcination of synthetic iron oxide
- Organic reduction processes
Synthetic red iron oxide pigments are widely used as essential colorants and functional materials, primarily in paints and coatings. By adhering to ASTM D3721, manufacturers and purchasers ensure consistent quality, performance, and safety for pigment products used in industrial and commercial applications.
Key Topics
The standard establishes specific requirements and properties for synthetic red iron oxide pigments, including:
- Total iron oxide content: Specifies a minimum content to ensure color intensity and opacity.
- Sulfur content: Limits to prevent adverse chemical interactions.
- Moisture and volatile matter: Sets a maximum level for durability and storage stability.
- Organic coloring matter: Requires absence to maintain pigment purity.
- Coarse particles: Restricts the percentage of residue retained on a 45-µm sieve to ensure a fine, consistent texture.
- Matter soluble in water: Imposes limits to avoid issues in formulation and application.
- pH value: Specifies a minimum pH for pigment suitability in various coating systems.
- Color and tinting strength: For pigments offered in a range of shades, the mass color and tint formed with white pigment must fall within agreed limits.
The document outlines sampling and testing procedures to determine compliance, referencing ASTM test methods for chemical analysis, moisture content, particle size, water solubility, and color/tint strength.
Applications
Synthetic red iron oxide pigment specified under ASTM D3721-05(2019) offers multiple applications across industrial, architectural, and commercial sectors, primarily where color durability and quality consistency are necessary. Typical uses include:
- Paints and coatings: For both protective and decorative finishes in construction, automotive, and industrial equipment.
- Colorants for plastics and rubbers: In products requiring heat stability and UV resistance.
- Construction materials: Such as colored concrete, tiles, and pavers.
- Inks and art supplies: For stable and vibrant red hues.
The pigment’s defined properties make it ideal for use in high-quality, long-lasting applications where aesthetics and performance must meet rigorous standards.
Related Standards
For comprehensive quality assurance, the following ASTM standards are referenced within ASTM D3721-05(2019):
- ASTM D50: Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments
- ASTM D185: Test Methods for Coarse Particles in Pigments
- ASTM D280: Test Methods for Hygroscopic Moisture and Volatile Substances in Pigments
- ASTM D387: Test Method for Color and Strength of Chromatic Pigments
- ASTM D1208: Test Methods for Common Properties of Certain Pigments
These standards detail the procedures and benchmarks for assessing pigment properties critical to manufacturing and product development.
ASTM D3721-05(2019) is vital for ensuring the reliability, consistency, and performance of synthetic red iron oxide pigment in paints, coatings, and related products. By following this specification, stakeholders in the pigment and coatings industry demonstrate compliance with internationally recognized standards and best practices.
Frequently Asked Questions
ASTM D3721-05(2019) is a technical specification published by ASTM International. Its full title is "Standard Specification for Synthetic Red Iron Oxide Pigment". This standard covers: ABSTRACT This specification covers synthetic red iron oxide pigment for use in paints and coatings manufactured by any of the following: calcination of iron salts, precipitation from iron salts, calcination of synthetic iron oxide, and product of organic reduction. The pigment shall conform to the requirements prescribed for the following: total iron oxide content, sulfur content, moisture and other volatile matter content, organic coloring matter content, coarse particles in dry pigments (total residue retained), matter soluble in water, and pH value. If the pigments are available in a range of colors, the mass color and the tinting strength or character of the tint formed by mixture with a white pigment shall be within the specified limits. The sampling and test methods to determine conformance of the pigments to the specified properties are given. SCOPE 1.1 This specification covers synthetic red iron oxide for use in paints and coatings manufactured by any of the following: 1.1.1 Calcination of iron salts. 1.1.2 Precipitation from iron salts. 1.1.3 Calcination of synthetic iron oxide. 1.1.4 Product of organic reduction. 1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ABSTRACT This specification covers synthetic red iron oxide pigment for use in paints and coatings manufactured by any of the following: calcination of iron salts, precipitation from iron salts, calcination of synthetic iron oxide, and product of organic reduction. The pigment shall conform to the requirements prescribed for the following: total iron oxide content, sulfur content, moisture and other volatile matter content, organic coloring matter content, coarse particles in dry pigments (total residue retained), matter soluble in water, and pH value. If the pigments are available in a range of colors, the mass color and the tinting strength or character of the tint formed by mixture with a white pigment shall be within the specified limits. The sampling and test methods to determine conformance of the pigments to the specified properties are given. SCOPE 1.1 This specification covers synthetic red iron oxide for use in paints and coatings manufactured by any of the following: 1.1.1 Calcination of iron salts. 1.1.2 Precipitation from iron salts. 1.1.3 Calcination of synthetic iron oxide. 1.1.4 Product of organic reduction. 1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D3721-05(2019) is classified under the following ICS (International Classification for Standards) categories: 87.060.10 - Pigments and extenders. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D3721-05(2019) has the following relationships with other standards: It is inter standard links to ASTM D3721-05(2011), ASTM D1208-96(2019), ASTM D1208-96(2012), ASTM D280-01(2012), ASTM D50-90(2011), ASTM D387-00(2008), ASTM D185-07, ASTM D1208-96(2007), ASTM D280-01(2007), ASTM D50-90(2005), ASTM D280-81(1995), ASTM D280-01, ASTM D387-00, ASTM D185-84(1999), ASTM D50-90(1999). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D3721-05(2019) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3721 −05 (Reapproved 2019)
Standard Specification for
Synthetic Red Iron Oxide Pigment
This standard is issued under the fixed designation D3721; 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
Fe O , min, % 96.0
2 3
Moisture and other volatile matter, max, % 1.0
1.1 This specification covers synthetic red iron oxide for use
Organic coloring matter none
Coarse particles (total residue retained on a 45-µm 1.0
in paints and coatings manufactured by any of the following:
(No. 325) sieve) max, %
1.1.1 Calcination of iron salts.
Matter soluble in water, max, % 0.2
1.1.2 Precipitation from iron salts. pH value, min 5.0
1.1.3 Calcination of synthetic iron oxide.
3.2 Inasmuchasironoxidepigmentsareavailableinarange
1.1.4 Product of organic reduction.
of colors, the mass color and, if desired by the purchaser, the
character of the tint formed by mixture with a white pigment
1.2 This international standard was developed in accor-
shall be within mutually agreed upon limits of a reference
dance with internationally recognized principles on standard-
sample mutually agreed upon between the seller and the
ization established in the Decision on Principles for the
purchaser. This sample should be tested in accordance with
Development of International Standards, Guides and Recom-
Test Method D387.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Sampling
2. Referenced Documents
4.1 Two samples shall be taken at random from different
packages from each lot, batch, day’s pack, or other unit of
2.1 ASTM Standards:
production in a shipment. When no markings distinguishing
D50 Test Methods for ChemicalAnalysis ofYellow, Orange,
between units of production appear samples shall be taken
Red, and Brown Pigments Containing Iron and Manga-
from different packages in the ratio of two samples for each
nese
10 000 lb (5000 kg), except that for shipments of less than
D185 Test Methods for Coarse Particles in Pigments
10 000 lb two samples shall be taken. At the option of the
D280 Test Methods for Hygroscopic Moisture (and Other
purchaser, the samples may be tested separately, or after
Matter Volatile Under the Test Conditions) in Pigments
blending in equal quantities the samples from the same
D387 Test Method for Color and Strength of Chromatic
production unit to form a composite sample.
Pigments with a Mechanical Muller
D1208 Test Methods for Common Properties of Certain
5. Test Methods
Pigmen
...
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