ASTM D 3721 - 05 Standard Specification for Synthetic Red Iron Oxide Pigment

American Society for Testing and Materials (ASTM). Current edition approved Sept. 1, 2005. Published September 2005. Originally approved in 1978. Last previous edition approved in 1999 as D 3721 – 83 (1999). 2 p. This specification covers synthetic red iron oxide for use in paints and coatings manufactured by any of the following:
1 Calcination of iron salts.
2 Precipitation from iron salts.
3 Calcination of synthetic iron oxide.
4 Product of organic reduction.