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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%).
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]
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 ).
Due to the normally high solids content of UV coating/varnish the surface of the cured film can be extremely reflective and glossy. 80 lb text and heavier weights of paper can be UV coated, however, cover weights are preferred. UV can be applied on spot locations of the paper or by flooding the page.
[2] [3] [4] Such synthetic fabrics can last for many years before deteriorating due to UV radiation. Marine canvas is typically used to protect materials susceptible to UV damage like varnished wood, non-UV resistant plastics, and outdoor stored sails. Other boat specific uses include hatch covers for interior sun protection and winch covers ...
For clothing, the ultraviolet protection factor (UPF) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to sun protection factor (SPF) ratings for sunscreen. [citation needed] Standard summer fabrics have UPFs around 6, which means that about 20% of UV will pass through. [citation needed]
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UV-absorbing compounds are used not only in sunscreen, but also in other personal care products, such as lipstick, shampoo, hair spray, body wash, toilet soap, and insect repellent. [2] Chemical filters protect against UV radiation by absorbing, reflecting, or scattering it.
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