Name: Zinc Pyrithione 10% Dry-Film Biocide Powder
Brand: Coatingsink
SKU: biocide-dry-film-zinc-pyrithione-10
Availability: InStock

Question 1

What is the difference between dry-film and in-can biocide protection?

Accepted Answer

Dry-film biocides such as zinc pyrithione protect the cured paint film against fungal and algal growth on exterior surfaces. In-can biocides (e.g., isothiazolinones) protect the wet formulation during storage. Most exterior architectural coatings require both types.

Question 2

At what loading level should zinc pyrithione 10% powder be incorporated into an exterior emulsion?

Accepted Answer

Effective dry-film protection is typically achieved at 0.3–1.0% of the total formulation weight, equating to 300–1000 ppm active ZnPT. Disperse in the pigment grind phase or add post-letdown under moderate shear to avoid agglomeration of the micronized particles.

Question 3

Is this product a direct replacement for IPBC in water-based exterior coatings?

Accepted Answer

Zinc pyrithione provides broad-spectrum fungicidal and algicidal activity and is frequently used as an IPBC alternative or co-biocide. Unlike IPBC, ZnPT is effective against algae, which is particularly relevant for damp or coastal climates. Confirm local regulatory status before substitution.

Density (25°C)	1.10 g/ml
Particle Size D50	≤5 μm
Recommended Dosage	0.3–1.0% on total formula
pH (10% dispersion)	6.5–7.5
Active Content (ZnPT)	10% w/w

Zinc Pyrithione 10% Dry-Film Biocide Powder

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