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Mineral Colloid BP

Targeted at waterbased paints and coatings, Mineral Colloid® BP is useful in ceramics (e.g. as a plasticizer in porcelains, gelling agent in glazes). It is a high purity white montmorillonite refined from carefully selected natural bentonite. It exhibits excellent thixotropic properties, enhancing suspension, stability and viscosity control.

Because Mineral Colloid BP is totally inorganic, it is not susceptible to enzyme attack or high temperatures during manufacturing. Mineral Colloid can be sheared repeatedly, has high gel strength and its rheology lends itself to excellent spray atomization.

Mineral Colloid imparts more plasticity to a porcelain than Gelwhite H (another similar material from Southern Clay Products). However it does not fire quite as white.

Wet, just-formed buttons of Mineral Colloid BP, Gelwhite H and Veegum T

Wet, just-formed buttons of Mineral Colloid BP, Gelwhite H and Veegum T

Each has been mixed with water and all produce a jelly-like translucent sticky material that takes a very very long time to dry. They are expensive and, among other uses, act as white-burning plasticizers in fine porcelain bodies.

Highly refined plasticizers after firing to cone 6

Highly refined plasticizers after firing to cone 6

Veegum (left), Mineral Colloid and Gelwhite fired to cone 6 oxidation. The Veegum is dense and white, but not melting. The Mineral Colloid fires like a typical raw bentonite (dark brown, high soluble salts and beginning to melt). The Gelwhite is completely melted and foamed.

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By Tony Hansen

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