Spray Sunscreen Formulation: SPF and Clogging Potential

Based on the formulation you provided for a spray sunscreen:

• Titanium Dioxide 200nm EasyDisperse 10%
• Zinc Oxide 200nm EasyDisperse 10%
• Dimethicone (Very Light, Low-Odor) 30%
• Cyclomethicone 30%
• Ethyl Alcohol 20%

Here is the information regarding SPF and potential for clogged pores:

Regarding SPF:
Calculating the exact SPF of a sunscreen formulation requires specific laboratory testing (in-vivo testing on human volunteers). It's not possible to determine the precise SPF just from the list and percentage of ingredients. However, with 10% Titanium Dioxide and 10% Zinc Oxide (a total of 20% mineral UV filters), this formulation contains a significant concentration of broad-spectrum UV blockers, which would likely provide a good level of sun protection.

Regarding clogged pores:
The ingredients in your formulation are generally considered less likely to clog pores:

• Titanium Dioxide and Zinc Oxide: These mineral filters sit on the skin's surface and are typically non-comedogenic.
• Dimethicone and Cyclomethicone: These are types of silicones. Silicones are widely used in cosmetics because they create a smooth feel and form a breathable barrier on the skin without penetrating pores, making them generally non-comedogenic.
• Ethyl Alcohol: While alcohol can be drying or irritating for some skin types, it is not typically associated with clogging pores. In a spray formulation, it helps the product feel light and dry quickly.

Given the nature of these ingredients, particularly the silicones and mineral filters, and the intended spray format which suggests a lightweight application, this formulation is less likely to cause clogged pores compared to heavier cream or lotion formulations containing comedogenic oils or waxes.