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Sunscreen optimizer
This might be useful.
https://www.sunscreen-optimizer.com/index.html
Although, I have to wonder how useful since sunscreen SPF values depend heavily on how the formula is produced, not just on the actives used.
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2 Replies
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Though I understand nano is best for sunscreen filters, I wish both this and BASF’s Sunscreen Simulator had options for non-nano TiO2 and ZnO. I get a lot of requests for “physical” SPF BB Cremes and moisturizers for the Whole Foods crowd.
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what we could really do with is some kind of study investigating how the measured SPF correlates to the elastic modulus and/or cone penetration of a formula, since those are the other major factors which affect it in practise
in my experience the BASF simulator tends to underestimate the actual in-vivo SPF value, and conversely, Labspheres tend to overestimate it, though both are generally accurate when it comes to UVA/UVB ratios
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