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Diethylamino hydroxybenzoyl hexyl benzoate is an organic compound used in sunscreens to absorb UVA radiation. It is marketed as Parsol DHHB by DSM and as Uvinul A Plus by BASF. DHHB has an absorption maximum of 354 nm. [1] [2] DHHB has excellent photostability and compatibility with other UV absorbers and other cosmetic ingredients. [3]
Tinted films are necessary for protection to 500 nm. [7] Window films filter out over 99% of UV rays at 380 nm, reducing the main factor in fading. However, additional factors such as solar heat, visible light, humidity, and presence or absence of chemical vapors also contribute to fading.
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 ...
“Chemical sunscreens,” such as avobenzone, oxybenzone and octinoxate, “absorb UV rays, while mineral sunscreens — zinc oxide or titanium dioxide — act as a physical barrier preventing UV ...
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%).
Windshield Sun Shades. Typically, the glass of the car's windshield itself blocks most of the UV light from the sun, and some of the infrared radiation.But it can't protect from the visible light that mostly penetrates through the window and gets absorbed by the objects inside the car.
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