SPF is a sunscreen indicator for UVB and one of the most common sunscreen indicators. UVB mainly causes sunburn and reddening of the skin. This damage will appear in a short time, so it is relatively easy to test with the human body. The higher the SPF value, the longer the protection time. For example, if Miss A’s sunburn time in the sun is 10 minutes, using SPF15 sunscreen can delay sunburn for 10 minutes × 15 times = 150 minutes.
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