Physical Sunscreen Formulation Inquiry

Regarding the physical sunscreen formulation you inquired about:

The formulation you provided includes the main physical sunscreen ingredients, Titanium Dioxide Transparent and Zinc Oxide Liquid, at a combined concentration of 30%. This amount is suitable for expecting SPF 50+ PA++++ protection.

Other ingredients such as Glycerin, Propylene Glycol, LipidSoft™ Lite, and PMMA are good choices for helping the product have a lightweight, non-greasy feel, absorb easily, and help absorb oil. This aligns with your requirements for a lightweight, non-greasy texture that doesn't leave a white cast (due to the use of transparent Titanium Dioxide and liquid Zinc Oxide).

However, the formulation you provided is missing crucial components: Emulsifier and Rheology Modifier. These are key to creating the "whipped cream" texture and the "breaks into water" characteristic, as well as ensuring the stability of the formula (preventing separation) and helping to evenly disperse the physical sunscreen particles for maximum sun protection efficacy.

Therefore, the formula you provided is a good starting point, containing appropriate sunscreen concentrations and ingredients to help achieve a lightweight feel and reduce white cast. However, it is necessary to add a suitable Emulsifier and Rheology Modifier system to achieve the specific texture and stability you desire. Testing the actual SPF/PA after developing the complete formula is also essential.