Sunscreen SPF Calculation and Ume Extract Storage
Asked by: nanosecond19
On: August 09, 2016
Product Type:
Cosmetics
Question
I have two questions:
- Regarding the example sunscreen formulation, why is the SPF so high? Based on the active content of
Titanium Dioxide 15nm Liquidwhich is 35.5% (34-37%), if the formula usesTitanium Dioxide 15nm Liquidat 25%, it would only contain 8.875% activeTitanium Dioxide. This should result in an SPF not exceeding 20. Is it possible that different forms of Titanium Dioxide result in different SPF values? - I'm confused about the storage instructions for
Ume Extract. The product page says to store it in the refrigerator, but the label on the product I received says to avoid heat and light. Which storage method is correct?
Answer
Based on the information from the forum post:
- Titanium Dioxide 15nm Liquid and SPF: The staff explained that the high SPF in the example formulation is not solely determined by the percentage of active Titanium Dioxide. It is significantly influenced by the specific form of the ingredient, including its particle size and coating technology, which affect its UV protection capabilities. They recommended testing the actual formulation for an accurate SPF and mentioned a co-funding program for testing.
- Ume Extract Storage: The staff clarified that the correct storage for Ume Extract is in the refrigerator for a longer shelf life (at least 2 years). They apologized for the error on the product label that suggested avoiding heat and light, stating that room temperature storage would reduce the shelf life (about 1 year). They offered compensation if the product was stored incorrectly due to the label error.