OSHA PEL: TWA 10 mg/m³
ACGIH TLV: TWA 5 mg/m³, welding fumes

Ferric oxide, with the CAS NO. 1309-37-1, it has many synonyms, such as Crystalline ferric oxide, Specular hematite, fe₂0₃, Specular red iron oxide, Specularite, Alaska black diamond, Specular jeweler's rouge, Iron oxide; Ferric oxide red. It is a red crystalline insoluble oxide of iron that occurs as haematite and rust and is made by heating ferrous sulphate: used as a pigment and metal polish.

Preparation of Ferric oxide: Ferric oxide is a product of the oxidation of iron. It can be prepared in the laboratory by electrolyzing a solution of sodium bicarbonate, an inert electrolyte, with an iron anode:
4 Fe + 3 O₂ + 2 H₂O → 4 FeO(OH)
The resulting hydrated Ferric oxide, written here as Fe(O)OH, dehydrates around 200 °C.
2 FeO(OH) → Fe₂O₃ + H₂O
It can also be prepared by the thermal decomposition of Ferric oxide under temperature above 200 °C.
2 Fe(OH)₃ → Fe₂O₃ + 3H₂O

Uses of Ferric oxide: The overwhelming application of Ferric oxide is as the feedstock of the steel and iron industries, e.g. the production of iron, steel, and many alloys.  It is also used to put the final polish on metallic jewelry and lenses, and historically as a cosmetic. Except for these, Ferric oxides are used as pigments in dental composites alongside titanium oxides.

You can still convert the following datas into molecular structure:
(1)InChI=1S/2Fe.3O;
(2)InChIKey=JEIPFZHSYJVQDO-UHFFFAOYSA-N;
(3)Smiles[Fe].O.[Fe].O.O;

The toxicity data is as follows: