Magnesium silicate (talc)
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Magnesium silicate
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Color Index
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Pigment White 26
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Formula
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3Mg 0.4 SO2 H2O
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Structure
Talc is hydrated magnesium silicate.
Properties
Magnesium silica is inert and hydrophobic. It does not settle in the wet paint because
of its plate-like form. It provides some resistance to humidity, improves flow behaviour,
and enhances the sanding properties of paint films.
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Properties of magnesium silicate
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Property
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Magnesium silicate
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Refractive Index
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1.57
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Density
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2.77
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pH
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8-9
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Oil Absorption
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27
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Hardness
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1
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Uses
Magnesium silica is used in both water- and solvent-based decorative paints, in
undercoats and industrial finishes, in coatings for building and construction, and
in anti-corrosion paints.
Price
This extender pigment is more expensive than calcium carbonate.
