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Mon Dec 18, 2006 11:05 am  |
TheresaL, I also agree with paleface on the description of loading of TiO2 and ZnO related to SPF factor. I ofter "estimate" the SPF value of sunscreen formulas that I make by multiplying the loading % of TiO2 or ZnO by a factor of 2. Therefore, a formula with 10% TiO2 would have a rough estimate SPF value of 20. When I send these formulas out to have the SPF value determined by testing on skin, I often find that the value I estimated is very, very close to the value found in actual use.
Multiplying the loading by a factor of 3 is just too high.
John |
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President and Chief Formulator for "Never Over The Hill Cosmetics" |
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