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ASTM D3721 2005 Edition, September 1, 2005
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Standard Specification for Synthetic Red Iron Oxide Pigment
Includes all amendments and changes through Reapproval Notice , 2011
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This specification covers synthetic red iron oxide 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.

Product of organic reduction.