Cosmetics Formulation Development

Hello, I would like to know Zinc Oxide 200nm EasyDisperse™ and Titanium Dioxide 200nm EasyDisperse™ each How much is 1% SPF? How do you calculate it? Thank you KP

Hello, in fact sun protection performance Can't calculate with any formula. cause because elements And the form of the formulation has a total effect on the effectiveness of sun protection. does not depend on สารกันแดด used in the formula alone. The way to do this is to measure it in the lab สารกันแดด at 1% for physical sunscreen ( Zinc Oxide , titanium dioxide) is very low and the SPF is also very low. Or maybe there is almost no sun protection due to the nature of the work. physical sunscreen must be covered or covered. So it can be effective in sun protection. Inadequate use is therefore ineffective while when starting to use at a greater rate until the level that covers the skin is sufficient. The value will jump higher like an exponential graph.