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Skeyndor Timeless Prodigy Eye Contour (20 ml) Glo Skin Beauty Satin Cream Foundation (40 ml / 1.4 floz) Julie Hewett Perfectly Fabulous Ora & Blush Duster
What contributes to the SPF in physical sunblocks?
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John C. Hill
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Mon Dec 18, 2006 11:05 am      Reply with quote
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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Skeyndor Timeless Prodigy Eye Contour (20 ml) Pevonia Lumafirm Repair Cream Lift & Glow (50 ml / 1.7 oz) Kaplan MD Perfect Pout Lipstick SPF 30 (3.13 g / 0.11 oz)



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