What does the SPF rating really mean? | 藥妝百科
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2022年4月21日—ButwhatdothoseSPFnumbersactuallymean?SPFstandsforSunProtectionFactor,andthenumberbesideitindicateshowwellthesunscreen ...
![What does the SPF rating really mean?](https://i.imgur.com/MEXDLMW.jpg)
Summer’s almost here, so once again it’s time to reach for the sunscreen. For most people, the default is to grab the bottle with the highest SPF. Bigger is better, right? But what do those SPF numbers actually mean?
SPF stands for Sun Protection Factor, and the number beside it indicates how well the sunscreen protects skin against sunburn. It is not an indicator of how long you can stay out in the sun, rather, it indicates how much longer it takes untanned skin to start to redden with sunscreen applied compared to how long it takes to start reddening without it.
To work out the SPF of a sunscreen, laboratory tests are carried out on an untanned patch of skin (such as the buttocks) of human volunteers. Sunscreen is applied liberally to the skin, which is then exposed to simulated sunlight via UV lamps. Measurements are taken of how long it takes the skin to get a minimal burn when ...
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