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ASTM D3721-05(2019)

ASTM D3721-05(2019)

Standard Specification for Synthetic Red Iron Oxide Pigment

2019-05-22 /Active

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.


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.

iron oxide; manganese; pigments;
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