Binder is the part of paint that forms the film. It holds pigment and filler together, sticks the film to the wall or metal and decides gloss, flexibility, water resistance and weathering. Paint binders, also called paint resins, are the largest cost item in most paints, so the choice matters.
On this page you will find the main binder families, which one suits which product, and the checks to run when a drum arrives.
We help you choose grades and suppliers, set simple receiving checks and keep your formula stable from lot to lot. For paint binders, material selection and supplier guidance come from the technical team of IPCS (Indian Paints Consulting Service).
Paint Binders overview
Think of paint as three parts: colour and body (pigment and filler), the carrier (water or solvent) and the binder. When the paint dries the carrier leaves, and the binder remains as a continuous film that locks everything in place. A better binder gives a longer-lasting film.
Acrylic emulsion binder is the standard choice for exterior emulsion paint. Industry testing describes all-acrylic binders as the gold standard for exterior house paint, with vinyl acrylic less durable over years of exposure. Alkyd resin for paint is the usual choice for gloss enamel.
Types of paint binders used in paint formulations
| Type | What it does | Where it fits |
|---|---|---|
| Pure acrylic emulsion | Best durability, weathering and alkali resistance | Exterior and premium interior emulsion paint |
| Vinyl acrylic and VAE emulsion | Good value with moderate durability | Economy interior paint; less suited to fresh masonry because high alkalinity can attack the vinyl acetate part |
| Styrene acrylic emulsion | Good water resistance and hardness | Primers and sealers, where UV exposure is limited |
| Alkyd resin | Hard gloss film that cures by oxidation | Synthetic enamel and wood and metal finishes |
| Epoxy and polyurethane resin | Strong adhesion and chemical resistance | Industrial and floor coatings |
Applications of Paint Binders
Each product family has its own binder.
Choosing paint binders for a paint formulation
What to compare
- End use: interior, exterior or industrial
- Climate and exposure
- Target gloss and film hardness
- Cost per litre of finished paint
- Compatibility with dispersant, thickener and preservative
Quality checks on receipt
- Solid content
- Viscosity
- pH
- Minimum film forming temperature
- Lumps or coagulum in the drum
Storage and handling
Store emulsion binders in closed drums away from frost and strong sun, because freezing can break an emulsion. Use first in, first out and stir the drum before use.
Frequently Asked Questions
What are the types of binders in paint?
The main families are acrylic, vinyl acrylic and VAE, styrene acrylic, alkyd, epoxy and polyurethane. Water-based wall paints mostly use acrylic family emulsions, and enamels use alkyd resins.
Which binder for exterior emulsion paint?
Pure acrylic emulsion. It resists sun, rain and the alkali in fresh masonry better than vinyl acrylic.
What is the difference between acrylic and vinyl acrylic binder?
Acrylic gives longer exterior life. Vinyl acrylic costs less and suits interior paint. High alkalinity can attack the vinyl acetate part, so it is less suited to fresh masonry.
What are paint resins?
Paint resins is another name for paint binders: the polymer that forms the dry film.
Where is alkyd resin for paint used?
Mainly in synthetic enamels, where a hard, glossy film is wanted on wood and metal.
What should I check when a binder drum arrives?
Check solid content, viscosity and pH, and look for lumps. Compare with the approved sample of the same grade.
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