Heating SPF Protect Ultra II in Cream/Lotion Formulation
Question
When formulating a cream or lotion containing SPF Protect Ultra II, is it necessary to heat the ingredient before mixing? If heating is recommended or chosen, what is the correct procedure for heating and mixing the water and oil phases?
Answer
Based on the staff's reply, the formula you provided is viable.
Regarding heating SPF Protect Ultra II, while it's not strictly necessary, applying heat during the mixing process helps ensure the sunscreen ingredients fully dissolve into the cream base, leading to optimal sun protection efficacy.
If you choose to use heat, the staff recommends heating both the water phase and the oil phase of your formula before combining them. Heating only one part and letting it cool before mixing with an unheated part can result in incomplete mixing.
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