Black Iron Oxide
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Black Iron Oxide
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Color Index
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Pigment Black 11
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Formula
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Fe3O4
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Structure
This pigment occurs naturally as magnetite and can be used in its natural form.
However, like most iron oxide pigments used in paint, it is now usually manufactured
synthetically.
Properties
It is a cheap, inert pigment with excellent solvent and chemical resistance, excellent
durability and weatherability and excellent light fastness. It possesses a low tinctorial
strength that can be an advantage when used as a tinter, as it allows more control.
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Properties of black iron oxide
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Property
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Natural
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Artificial
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Density
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5.5
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4.7-4.8
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Heat Stability
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180°C
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400°C in an oxidant medium
800°C in a reductor medium
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Oil Absorption
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low compared to other black pigments
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Uses
It is mainly used in applications where the tendency of carbon black to float cannot
be tolerated (for example in grey tones in combination with titanium dioxide).
