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The SPF, or sun protection factor, measures how well sunscreen protects against sunburn, according to the American Academy of Dermatology (AAD). So how do the different levels of SPF measure up?
To make sure you are adequately protecting your skin from damaging rays, dermatologists say this is the exact amount of sunscreen to slather on. Plus, tips on how to reapply.
The sun protection factor (SPF rating, introduced in 1974) is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that 1 ⁄ 15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter [65] (mg/cm 2). It is ...
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%).
Data presented to the Food and Drug Administration by the Cosmetic, Toiletry and Fragrance Association indicates a −36% change in avobenzone's UV absorbance following one hour of exposure to sunlight. [15] For this reason, in sunscreen products, avobenzone is always formulated together with a photostabilizer, such as octocrylene. Other ...
Most people only apply 25 to 50 per cent of recommended amount
Bemotrizinol (INN [1] [2] /USAN, [3] INCI bis-ethylhexyloxyphenol methoxyphenyl triazine) is an oil-soluble organic compound that is added to sunscreens to absorb UV rays. It is marketed as Parsol Shield, Tinosorb S, and Escalol S. Bemotrizinol is a broad-spectrum UV absorber, absorbing UVB as well as UVA rays.
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