Name: Zinc Oxide Nanoparticle Dispersion 30% (UV-Block)
Brand: Coatingsink
SKU: zinc-oxide-nanoparticle-disp
Availability: InStock

Question 1

Why are nano-sized ZnO particles used instead of standard micron-size ZnO for transparent UV-protective coatings?

Accepted Answer

Standard micron-size ZnO particles (>1 µm) scatter visible light due to Mie scattering, producing white, opaque films unsuitable for clear topcoats or optical applications. Nanoparticle ZnO at 20–40 nm is below the wavelength of visible light (~400–700 nm), so it does not scatter visible radiation and produces transparent films. Despite their transparency to visible light, nanoparticles strongly absorb UV (280–380 nm) because ZnO's bandgap energy matches UV photon energy, providing excellent UV blocking.

Question 2

Are ZnO nanoparticle dispersions safe for cosmetic and personal care applications?

Accepted Answer

ZnO nanoparticles are approved as UV filters in cosmetics in the EU (EU Cosmetics Regulation Annex VI, up to 25%), USA (FDA monograph) and most major markets when uncoated or with approved surface coatings. The main regulatory requirement is that they should not be used in spray or powder forms that risk inhalation. In coatings, ZnO nano-dispersions are fixed within the cured film and do not present inhalation risk during use. Always verify the specific grade against the target application's regulatory framework.

Solid Content	30±1%
Dispersing Medium	isopropanol or water grade
ZnO Particle Size	20–40 nm
UV Absorption (340nm)	≥99.9%
Transparency (1µm DFT)	>90% visible light

Zinc Oxide Nanoparticle Dispersion 30% (UV-Block)

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