Recommended Zinc Oxide and Titanium Dioxide for Aerosol Sunscreen Spray

For an aerosol sunscreen spray formulation containing oil, chemical sunscreens, and a high percentage of alcohol (30-50%), it is recommended to use Zinc Oxide and Titanium Dioxide grades that are dispersed in oil or silicone bases. These types are generally more compatible with the oil and alcohol phase of your formula compared to water-based dispersions.

Suitable Grades:

• Zinc Oxide: Look for dispersions in oil or silicone. Examples include:

  • Zinc Oxide Transparent Dispersion (C12-15 alkyl benzoate Base)
  • Zinc Oxide Transparent Dispersion (Isopropyl Palmitate Base)
  • Zinc Oxide (40nm, Triethoxycaprylylsilane Coated) (powder, but coated for oil/silicone dispersion)
  • Zinc Oxide 35nm Liquid (dispersible in oil/silicone)

• Titanium Dioxide: Similarly, oil or silicone-based dispersions are preferred. Examples include:

  • Titanium Dioxide Transparent (10nm, C12-15 Alkyl Benzoate Base)
  • Titanium Dioxide Transparent (15nm, C12-15 Alkyl Benzoate Base)
  • Titanium Dioxide Transparent (15nm, Cyclopentasiloxane Base)

Using pre-dispersed liquid forms is often easier for achieving uniform distribution in low-viscosity spray formulations.

Alcohol Compatibility of Specific Grades:

Regarding the two specific grades you linked:

• Zinc Oxide 40nm Dispersion (Water Base): This product is dispersed in water. It is not suitable for a formula with high oil and alcohol content as it will not be compatible with the main phase of your formulation.

• Zinc Oxide 35nm Liquid: This product is dispersible in oil/silicone. While the description does not explicitly mention alcohol compatibility, its dispersion base makes it more likely to be compatible with your formula compared to a water-based dispersion. However, due to the high percentage of alcohol (30-50%), it is essential to perform compatibility testing with your specific formula to ensure stability and proper dispersion.

Always test the compatibility and stability of the chosen physical sunscreens in your complete formula, especially with high alcohol content, to ensure effective and stable sun protection.