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WebSun Protection Factor (SPF) SPF is a measure of how much solar energy (UV radiation) is required to produce sunburn on protected skin (i.e., in the presence of sunscreen) relative to the... WebDec 30, 2005 · If SPF Fe. chinensis stocks are to be an option for the American shrimp farming industry, they will have to be developed from feral populations of shrimp. Hence, … WebAug 22, 2024 · SPF stands for “ Sun Protection Factor ”, and is a measure of the sunscreen’s ability to protect your skin from UVB rays. The basic calculation works like this: “If it takes 1 minute for your unprotected skin to start turning red [in the sun], using an SPF 15 sunscreen theoretically prevents reddening 15 times longer.” find my account number bank of america