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2. 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 ...

3. Sunscreen - Wikipedia

   en.wikipedia.org/wiki/Sunscreen

   In the EU, sunscreen labels can only go up to SPF 50+ (initially listed as 30 but soon revised to 50). [73] Australia's Therapeutic Goods Administration increased the upper limit to 50+ in 2012. [74] [75] In its 2007 and 2011 draft rules, the US Food and Drug Administration (FDA) proposed a maximum SPF label of 50, to limit unrealistic claims.

4. Ultraviolet index - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet_index

   Reduce time in the sun between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 50+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. Bright surfaces, such as sand, water, and snow, will increase UV exposure.

5. 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%).

6. Does sunscreen expire, what does SPF mean and which ... - AOL

   www.aol.com/does-sunscreen-expire-does-spf...

   Keep your skin protected while in the sun. For premium support please call: 800-290-4726 more ways to reach us

7. SPF - Wikipedia

   en.wikipedia.org/wiki/SPF

   Sun protection factor, of sunscreen; Specific-pathogen-free, laboratory animals known to be without pathogens; Superplastic forming, of sheet metal; Space Power Facility, a NASA test facility; S-phase-promoting factor, in biology; Formal spectrum of a ring, a construction in algebraic geometry; Spray polyurethane foam, a building insulation ...