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  2. Sunscreen - Wikipedia

    en.wikipedia.org/wiki/Sunscreen

    A SPF of 6; UVA/UVB ratio ≥ 1/3; The critical wavelength is at least 370 nanometers (indicating that it is "broad-spectrum"). Instructions for using and precautions. Evidence the sunscreen meets UVA and SPF requirements. [163] Labels of European sunscreens must disclose the use of nanoparticles in addition to the shelf life of the product ...

  3. Does sunscreen expire? Should you wear it indoors ... - AOL

    www.aol.com/lifestyle/does-sunscreen-expire-wear...

    The AAD recommends using a broad-spectrum sunscreen — meaning it protects against both UVA rays (which prematurely age skin) and UVB rays (which cause sunburn) — with SPF 30 or higher.

  4. We asked a dermatologist the most common questions about SPF ...

    www.aol.com/lifestyle/asked-dermatologist-most...

    As SPF levels increase beyond 50, the formulations tend to be thicker and leave a chalkier appearance, and most people will under compensate that white chalkiness by not utilizing the right amount ...

  5. 3 dermatologists explain why you still need to wear sunscreen ...

    www.aol.com/lifestyle/3-dermatologists-explain...

    The American Academy of Dermatology recommends using a sunscreen that offers a minimum protection of SPF 30, broad-spectrum coverage so it will properly defend against UVA and UVB rays, both of ...

  6. Sun protective clothing - Wikipedia

    en.wikipedia.org/wiki/Sun_protective_clothing

    UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).

  7. Ensulizole - Wikipedia

    en.wikipedia.org/wiki/Ensulizole

    Ensulizole is primarily a UVB protecting agent providing only minimal UVA protection. The scope of UVB is 290 to 340 nanometers whereas the UVA range is 320 to 400 nanometers. [ 2 ] For better UVA protection, it must be paired with avobenzone , titanium dioxide , or zinc oxide ; outside of the United States it can also be paired with a UV ...

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