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Sun protection factor

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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  • the Sun protection factor (SPF) is a method of categorising the protection against ultraviolet B wavelength sunlight (UVB)
  • the SPF provides an estimate of the efficiciency in blocking UVB sunlight; the SPF number of a sunscreen indicates the incremental protection offered by the specific preparation; thus a sunscreen with a SPF of 10 theoretically means that person using this preparation may remain in sunlight 10 times longer without burning

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