In paints and coatings, fillers (also called extenders) are added to adjust texture, enhance opacity, improve durability, and reduce formulation costs.

Common Paint Fillers:

• Calcium Carbonate: The most widely used; improves brightness, whiteness, and rheology.

• Talc: Offers a matte finish, good dispersibility, and weather resistance.

• Barium Sulfate: High density and chemical resistance; used in high-performance coatings.

• Kaolin Clay: Enhances smoothness, controls gloss, and improves scrub resistance.

Why Use Fillers in Paint Formulas?

• Improve film properties

• Enhance hiding power and color stability

• Control gloss and flow

• Extend expensive pigments like titanium dioxide

High-quality fillers ensure a smooth surface finish and help coatings perform better under harsh environmental conditions. The type and particle size of the filler significantly influence the final performance.