Zinc Oxide (Sunscreen Grade > 100nm)
What is Zinc Oxide (Sunscreen Grade > 100nm)?
Zinc oxide, chemically ZnO, is an inorganic white powder sourced from the mineral zincite or produced synthetically through processes like the French process. In cosmetics, sunscreen-grade versions feature particles exceeding 100nm, classifying them as non-nano. Primarily functioning as a UV filter, it physically blocks and scatters ultraviolet A and B rays on the skin's surface rather than absorbing them. This mechanism supports broad-spectrum protection in mineral sunscreens. Additionally, it serves as a colorant, delivering opacity and a uniform white shade to products like foundations and creams, ensuring batch consistency and visual appeal. Its inert nature contributes to stability in formulations, and it appears in diverse items from sunscreens to ointments, prized for barrier-forming qualities without deep penetration.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Reflects UVA and UVB rays for physical sun protection.
Imparts white opacity and consistent coloring to products.
Non-comedogenic, reducing pore-clogging potential.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| People preferring mineral over chemical UV filters. | Those with known zinc allergies. |
| Individuals with sensitive skin seeking gentle options. | People experiencing irritation from mineral-based formulas. |
| Users wanting added product opacity and coverage. | Individuals sensitive to white casts in products. |
Safety Notes
- Rated low concern by safety assessors in cosmetics.
- Non-nano size minimizes absorption and inhalation risks.
Frequently Asked Questions about Zinc Oxide (Sunscreen Grade > 100nm)
What makes sunscreen-grade zinc oxide different?
Particles over 100nm ensure it acts on skin surface as a physical UV blocker without nano-scale concerns.
Is zinc oxide safe for daily use?
Assessors deem it safe in cosmetics at typical levels, with low irritation potential.
Does it work on all skin tones?
Provides protection universally but may leave visible white tint, blendable in modern products.