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Is Sunblock SPF 85 really better than SPF 30 or 40?

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Is Sunblock SPF 85 really better than SPF 30 or 40?

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The SPF (Sun Protection Factor) of a sunscreen is a laboratory measure of the effectiveness of sunscreen — the higher the SPF, the more protection a sunscreen offers against UV-B (the ultraviolet radiation that causes sunburn). The SPF indicates the time a person with sunscreen applied can be exposed to sunlight before getting sunburn relative to the time a person without sunscreen can be exposed. For example, someone who would burn after 12 minutes in the sun would expect to burn after 120 minutes if protected by a sunscreen with SPF 10. In practice, the protection from a particular sunscreen depends on factors such as: * The skin type of the user. * The amount applied and frequency of re-application. * Activities in which one engages (for example, swimming leads to a loss of sunscreen from the skin). * Amount of sunscreen the skin has absorbed. Sources: http://en.wikipedia.

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Sunblock protects your skin by absorbing and/or reflecting UVA and UVB radiation. All sunblocks have a Sun Protection Factor (SPF) rating. The SPF rating indicates how long a sunscreen remains effective on the skin. A user can determine how long their sunblock will be effective by multiplying the SPF factor by the length of time it takes for him or her to suffer a burn without sunscreen. For instance, if you normally develop a sunburn in 10 minutes without wearing a sunscreen, a sunscreen with an SPF of 15 will protect you for 150 minutes (10 minutes multiplied by the SPF of 15). Although sunscreen use helps minimize sun damage, no sunscreen completely blocks all wavelengths of UV light. Source:dermatology.ucsf.edu Sources: http://www.dermatology.ucsf.edu/skincancer/General/prevention/Sunscreen.

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