How SPF Numbers Are Calculated (and Why It Matters)

Описание: Sun Protection Factor, commonly called SPF, is a measure of how much longer it takes for protected skin to burn from UVB rays compared to how much longer it takes for unprotected skin to burn from UVB.

Protected skin is the skin covered with the sunscreen we are determining the SPF number for. Unprotected skin has no sunscreen on it. It is bare skin.

SPF number indicates how well the sunscreen protects our skin against sunburn. Sunburn is caused by Sun's UVB radiation.

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