Pigments & Colorants
REACH
Ferric ferrous oxide
CAS Number
1317-61-9
EC Number
215-277-5
What is Ferric ferrous oxide?
Ferric ferrous oxide (CAS 1317-61-9), also known as Iron(II,III) oxide and commercially as E172, is a mixed-valence iron oxide.
Where is Ferric ferrous oxide used?
- Pigments: black colorant for concrete and coatings
- Construction materials: consistent color performance and UV stability
- Electronics: core material in magnetic recording media and ferrite components
- Electromagnetic shielding
- Catalysis: active phase or support material in chemical synthesis and gas treatment, including hydrogen production
- Corrosion-inhibiting primers and protective coatings for automotive and structural steel extend substrate service life.
Good to know: Food-grade material is available under the E172 designation, meeting specifications for use as a colorant in regulated applications.
Commercial specifications
- Particle size and surface area specifications vary by end-use requirement
Other Names (Synonyms)
Iron(ii,iii) oxide|Iron oxide (Fe3O4)|Oxoiron;oxo(oxoferriooxy)iron|E172
What are the physical properties of Ferric ferrous oxide?
Melting Point 1535 °C
Density 5.1 g/cm³ (solid) (nanoparticles)
Flash Point 7 °C
Appearance solid
Color black
Odor Odorless
Form powder
Water Solubility Insoluble in water and organic solvents. Soluble in concentrated mineral acids.
Refractive Index 3.0
How is Ferric ferrous oxide classified and handled safely? Learn More
Warning
GHS02· Flammable GHS07· Irritant
Hazard Statements
H252 Self-heating in large quantities; may catch fire
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
Precautionary Statements
P235 Keep cool.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
Which trade and regulatory codes apply to Ferric ferrous oxide?
HS Code 28211000
Storage Class 11 - Combustible Solids