Long before modern polymer additives entered the paint industry, zinc oxide was already valued as a functional pigment and protective agent. Today, paints and coatings grade zinc oxide continues to play an important role wherever a formulation needs anti-corrosive protection, UV stability, or reliable opacity – properties that are especially critical for marine coatings, industrial primers and exterior architectural paints exposed to harsh weather conditions.

Corrosion Resistance in Protective Coatings

Metal structures exposed to moisture and salt air are constantly at risk of corrosion, and zinc oxide is widely used in primers and protective coatings precisely because it interferes with the electrochemical reactions that drive rust formation. In marine and industrial coatings, zinc oxide helps extend the service life of steel structures, pipelines, ship hulls and offshore equipment by slowing the corrosion process at the metal surface.

UV Absorption and Weather Stability

One of zinc oxide’s most valuable properties in exterior coatings is its ability to absorb ultraviolet radiation. UV exposure is a leading cause of paint film degradation – chalking, colour fading and eventual cracking. Zinc oxide’s UV-absorbing characteristics help protect the resin binder in a coating from photodegradation, meaning exterior paints formulated with the right zinc oxide grade tend to hold their colour and integrity significantly longer under direct sunlight.

Improving Opacity and Film Properties

Beyond its protective role, zinc oxide contributes to a coating’s hiding power and film hardness. It reacts with free fatty acids in oil-based paints to form zinc soaps, which can improve film flexibility and reduce the tendency of a coating to crack over time. In water-based formulations, it also acts as a mild fungicide, helping inhibit mould and mildew growth on painted surfaces – a useful property for coatings used in humid climates.

Selecting the Right Grade for Your Formulation

Coating formulators typically evaluate zinc oxide based on particle size, oil absorption value and purity, since these properties directly influence dispersion quality, gloss retention and overall formulation stability. Working with a manufacturer that offers grade-specific technical support helps avoid trial-and-error reformulation and ensures consistent results across production batches.

Anvith Industry produces paints and coatings grade zinc oxide engineered for anticorrosive primers, marine coatings and UV-stable exterior finishes. Reach out to our technical team for grade recommendations suited to your formulation.