Low SPF in Cream with SPF Protect Ultra II

Based on the information for SPF Protect Ultra™ II, achieving the expected SPF value requires careful formulation and mixing. The product description specifically states that heat (70-80°C) is needed to melt and properly incorporate the ingredient into the formula for full sun protection performance.

It is likely that the low SPF value (5) you measured is due to the SPF Protect Ultra™ II not being fully dissolved or evenly dispersed in your cream base.

Here are some recommendations:

• Review Mixing Method: Ensure you are heating the oil phase containing SPF Protect Ultra™ II to 70-80°C and blending it thoroughly with the water phase (also heated to 60-70°C) for at least 15 minutes, as suggested in the sample formulas provided in the product description. Proper emulsification and dispersion are crucial.
• Follow Sample Formula: Try following the sample formula for 15% SPF Protect Ultra™ II provided on the product page as closely as possible to see if you can achieve the expected SPF.
• Avoid Refrigeration: Do not refrigerate the finished product, as this can cause the organic/chemical sunscreen components to recrystallize and reduce efficiency.
• Consider Measurement Service: MySkinRecipes offers a free SPF measurement service if you use this sunscreen. You can contact customer service for details on how to submit your sample for testing after adjusting your formulation.

By ensuring the SPF Protect Ultra™ II is correctly processed and dispersed according to the product's instructions, you should be able to significantly increase the SPF of your cream.