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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 [68] (mg/cm 2). It is ...
The organisational structure of the SPF is split between staff and line functions, which is roughly modelled after the Singapore Armed Forces (SAF). The SPF currently consists of sixteen staff departments, four specialist staff departments, eighteen specialist and line units as well as seven land divisions.
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%).
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 ...
Cerave AM Moisturizing Lotion with SPF 30 $14.71 at Amazon. Cerave AM Moisturizing Lotion with SPF 30 $19.99 at Ulta. 4.5-star average rating from 87,814 reviews on Amazon
SPF may refer to: Science and technology. Sun protection factor, of sunscreen; Specific-pathogen-free, laboratory animals known to be without pathogens;
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