Cosmetics Formulation Development

An example of a sunscreen formula. Zinc Oxide 35nm Liquid / Titanium Dioxide 15nm Liquid ( Water-in-Oil Cream ) 1.Water 44% 2. Cyclomethicone 15% 3. Titanium Dioxide 15nm Liquid 25% 4. Zinc Oxide 35nm Liquid 15% 5. Mild Preserved Eco 1% What is the SPF formula?

Hello, it should be close to SPF 50, but if you want to know the real value Must be submitted for testing because SPF depends on many factors such as Emulsifier , spinning method , other elements in the recipe too

This formula, if the customer wants to put น้ำมันมะรุม is a selling point, how many % to how many % can be put in the formula to remain stable?