Zinc Oxide in Cosmetic Formulation: Non-Nano Sunscreen & Skincare Guide
For formulators and small business owners crafting effective skincare and sun protection products, understanding the role of zinc oxide powder cosmetic is essential. With its excellent UV protection properties and gentle nature, zinc oxide is a preferred ingredient in mineral sunscreen formulations and other skincare applications. This guide dives deep into the science, formulation tips, and practical recipe details to help you confidently incorporate zinc oxide in your creations.
Background and Science of Zinc Oxide in Skincare
Zinc oxide is an inorganic compound widely used in cosmetic formulations for its unique ability to reflect and scatter ultraviolet (UV) radiation, providing broad-spectrum sun protection. Unlike chemical UV filters, zinc oxide acts as a physical barrier on the skin’s surface, making it a popular choice in non-nano zinc oxide sunscreen formulations that prioritise safety and minimal skin irritation.
The term “non-nano” refers to the particle size of zinc oxide, with non- nano particles being larger than 100 nanometres. This size reduces the likelihood of skin penetration, aligning with current cosmetic safety preferences and regulations, especially in Australia where zinc oxide percentage sunscreen Australia guidelines encourage formulations with effective but safe levels of mineral UV filters.
Zinc oxide also supports the appearance of skin by helping it feel smooth and protected, and it is used in formulations ranging from sunscreens to moisturisers and balms. Its mild nature suits sensitive skin types and can be combined synergistically with oils such as Raspberry Seed Oil, which adds antioxidant properties and emollience.
Properties Comparison of Zinc Oxide and Alternatives
| Ingredient | INCI Name | Fatty Acid Profile | Comedogenic Rating | Suitable Skin Types |
|---|---|---|---|---|
| Zinc Oxide | Zinc Oxide | Inorganic mineral, no fatty acids | 0 (non-comedogenic) | All skin types, especially sensitive and acne-prone |
| Titanium Dioxide | Titanium Dioxide | Inorganic mineral, no fatty acids | 0 (non-comedogenic) | All skin types, sometimes used with zinc oxide for broad spectrum |
| Raspberry Seed Oil | Rubus Idaeus Seed Oil | Linoleic 40-55%, Oleic 15-30% | 1-2 (low) | Normal to dry, sensitive skin |
| Shea Butter | Butyrospermum Parkii Butter | Oleic 40-60%, Stearic 20-50% | 0-2 (low to moderate) | Dry, mature skin |
Formulation Guide for Zinc Oxide Powder Cosmetic
When formulating with zinc oxide, especially for non-nano zinc oxide sunscreen creations, particle dispersion is crucial to avoid clumping and ensure a smooth, cosmetically elegant finish. Zinc oxide is typically incorporated at 10-25% w/w depending on desired SPF and regulatory limits in Australia.
Combining zinc oxide with nourishing carrier oils like Raspberry Seed Oil and emollient butters facilitates skin feel and enhances moisturisation benefits. Additionally, using natural emulsifiers and stabilisers from our Butters & Waxes and Carrier Oils collections can optimise product texture.
| Phase | Ingredient | INCI Name | % (w/w) | Grams (100g batch) |
|---|---|---|---|---|
| Oil Phase | Raspberry Seed Oil | Rubus Idaeus Seed Oil | 15.0 | 15.0 |
| Oil Phase | Shea Butter | Butyrospermum Parkii Butter | 10.0 | 10.0 |
| Oil Phase | Emulsifying Wax | Polawax / Cetearyl Alcohol + Polysorbate 60 | 8.0 | 8.0 |
| Water Phase | Distilled Water | Aqua | 46.0 | 46.0 |
| Active Phase | Zinc Oxide (non-nano) | Zinc Oxide | 20.0 | 20.0 |
| Cool Down | Preservative (e.g. Geogard 221) | Phenethyl Alcohol, Caprylyl Glycol | 1.0 | 1.0 |
- Heat the oil phase ingredients (Raspberry Seed Oil, Shea Butter, Emulsifying Wax) to 70-75°C until fully melted and homogeneous.
- Heat the water phase (Distilled Water) separately to 70-75°C.
- Slowly add the water phase to the oil phase while mixing continuously with a high-shear mixer or stick blender to form an emulsion.
- Cool the emulsion down to approximately 40°C with gentle stirring.
- Disperse the Zinc Oxide powder cosmetic gradually into the cooled emulsion, ensuring even dispersion; avoid lumps.
- Add the preservative and mix thoroughly.
- Adjust pH if necessary (ideal pH 5.5-6.5) and package in suitable containers.
Frequently Asked Questions
In Australia, zinc oxide is commonly used between 15-25% w/w in mineral sunscreen formulations to achieve effective broad-spectrum UV protection while complying with regulatory guidelines.
Yes, zinc oxide supports the appearance of skin in moisturisers by providing a subtle protective barrier and mattifying effect, making it suitable for daily skincare products.
Non-nano zinc oxide has larger particle sizes reducing the likelihood of skin penetration, which is preferred in ‘natural’ and sensitive skin formulations and complies with certain cosmetic safety standards.
Using finely milled zinc oxide, thorough dispersion with high-shear mixing, and combining with emollient oils like Raspberry Seed Oil can enhance spreadability and skin feel.
Disclaimer: This information is provided for cosmetic formulation purposes only. The Skin Science Company does not provide medical advice or therapeutic claims. Always comply with local regulations and perform appropriate safety and stability testing for your formulations.