Cosmetics Formulation Development

I want to know that the SPF value of Titanium Dioxide 15nm Liquid and Zinc Oxide 35nm Liquid in 1% = SPF How much?

Hello Titanium Dioxide 15nm Liquid 1% gives an SPF of approximately 2.0. Zinc Oxide 35nm Liquid 1% gives SPF about 1.0- 1.5 [ Zinc Oxide focuses more on PA or UVA protection. SPF or UVB protection] Use both together or in combination with สารกันแดด will be able to enhance the action and make 1% of each ส่วนผสมกันแดด gives a higher value, therefore calculating SPF/PA is not easy. because when used together with สารกันแดด Other SPF/PA values will vary with synergy or supplementation to work.