Micaceous Iron Oxide

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Product Benefits
Technical Details

Micaceous iron oxide (iron oxide, Fe2O3) is a naturally occurring iron oxide with lamellar shape similar to mica (hence the name). Micaceous iron oxide is characterised by:


  • Black colour
  • Lamellar structure
  • High inertness in various media (the iron in the mineral has already been oxidised).


Basic properties

Property Value Unit
Moisture 0.1 [%]
pH 9 [-]
Hardness (Mohs) 6 [-]
Electrical conductivity 60 [µS/ cm]
Colour black [-]
Lamellarity > 70 [%]
Soluble matter < 0.1 [%]
L.O.I. 0.6 [%]
Density 4.7 [kg/ dm3]

Product overview

Product Grade + 63 µm


+ 75 µm


+ 125 µm



[g/ 100 g]

Portafer AP65 3.7 1.6 17
AP75 12.5 5.0 15

Production location Portafer AP


Portafer AP is the brand name for Sibelco’s micaceous iron oxide products.




  • Abrasion resistance: due to its hardness of 6 on Mohs scale, MIO will increase the coating’s resistance to wear.
  • Chemical resistance: due to its lamellar structure and inert nature, MIO provides barrier properties to the primer and topcoat and good chemical resistance compared to conventional fillers.


  • Mechanical reinforcement: due to its lamellar structure, MIO will mechanically reinforce the binder matrix.
  • UV resistance: being insensitive to UV radiation, MIO will reduce the coating’s degradation.


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