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Dr. Linkner: The most important part of a sunscreen label is the SPF or the sun protection factor level which gives you the interval time frame of which the sunscreen will prevent you from ...
And when it comes to UVB protection, the difference between SPF 100 and SPF 50 is "marginal," according to the Times. "Far from offering double the blockage, SPF 100 blocks 99% of UVB rays, while ...
And for the record: when applied properly, products with an SPF of 30 block 97% of UVB rays, while SPF 50 blocks 98% of UVB rays—so opt for SPF 50 whenever you can!
In the EU, sunscreen labels can only go up to SPF 50+ (initially listed as 30 but soon revised to 50). [76] Australia's Therapeutic Goods Administration increased the upper limit to 50+ in 2012. [77] [78] 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.
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%).
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.
“I get wary of anything higher than SPF 50 simply because it lulls people into a sense of safety when it reality,” she says, there is “little to no difference” between SPF 30 and SPF 50.
R. Sayre was the lead researcher of in vitro SPF testing for traditional summer fabrics. [quantify] This revealed that traditional summer clothing in North America offered less than 15 SPF protection, the minimum level recommended by doctors. These traditional summer fabrics tested between SPF 5–9 when dry and SPF 3–9 when wet. [9]
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