When choosing an SPF it is best to look for ZINC as a main ingredient. The SPF number is just a guide to let you know when to reapply. For example, if you burn after 10 minutes of sun exposure, an SPF of 15 will allow you to be in the sun for up to 150 minutes without burning. But before you grab your calculator and head for the beach, you should know that this equation is not always accurate. People usually use far less sunscreen than the amount used in testing. In the real world, the average sun worshipper uses half the amount of sunscreen used in the laboratory, which could result in a sunburn in half the time. However, as a general rule: Minutes to burn without sunscreen x SPF number = maximum sun exposure time
Posted on: Tue, 29 Apr 2014 15:47:04 +0000
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