Paint fillers and extenders are mineral powders that add body, smoothness and volume to paint and reduce its cost. Calcium carbonate is the most common, and talc and china clay are also used. Here you will find the types, how they differ and how to choose.
Paint extender pigments let you use less of the costly pigments while keeping the film strong.
We help you choose grades and suppliers, set simple receiving checks and keep your formula stable from lot to lot. IPCS (Indian Paints Consulting Service) offers raw material selection and sourcing guidance, including advice on paint fillers and extenders.
Fillers & Extenders overview
Fillers fill the space between pigment particles. They improve body and brushing, control sheen and make the film harder, and they cost less than pigment. Too much filler can weaken the film, so the amount is set with the binder and pigment together.
Calcium carbonate for paint comes as ground or precipitated grades with different particle sizes. Talc in paint gives a smooth feel and helps suspension.
Types of fillers & extenders used in paint formulations
| Type | What it does | Where it fits |
|---|---|---|
| Calcium carbonate, ground | Body and bulk at low cost | Emulsion paint, putty and distemper |
| Calcium carbonate, precipitated | Finer size, better opacity support | Premium interior paint |
| Talc | Smooth film, helps suspension | Primers, enamels and emulsion paint |
| China clay | Body and opacity support | Emulsion paint and primers |
| Barytes and others | Dense filler for special uses | Primers and industrial paint |
Applications of Fillers & Extenders
The filler you pick changes cost, feel and film strength.
Choosing fillers & extenders for a paint formulation
What to compare
- Types of fillers used in paint: match particle size to the product
- Calcium carbonate grades for emulsion paint: finer for premium, coarser for economy
- Talc vs calcium carbonate in paint: talc for smooth film and suspension, calcium carbonate for cost and brightness
- Whiteness and oil absorption
- Supply of a steady grade
Quality checks on receipt
- Whiteness
- Moisture
- Particle size or residue on sieve
- Oil absorption
Storage and handling
Keep fillers dry in sealed bags or silos. Moisture causes lumps and slow dispersion.
Frequently Asked Questions
What are the types of fillers used in paint?
Calcium carbonate, talc, china clay, barytes and similar minerals.
Which calcium carbonate grades for emulsion paint?
Finer grades for premium paint and coarser grades for economy paint. Check whiteness and oil absorption with your supplier's data.
What is talc vs calcium carbonate in paint?
Talc gives a smooth film and helps suspension. Calcium carbonate is bright and low in cost. Many formulas use both.
What are paint extender pigments?
Mineral powders that extend the pigment and add body at lower cost.
Can I use too much filler?
Yes. Too much weakens the film, so the level is set with the binder and pigment together.
How should I store fillers?
Dry, in sealed bags or silos.
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