Avoid Dash Cracks - PeachParts Mercedes-Benz Forum

JamesStein · #26 08-19-2004, 03:22 PM

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UVA rays damage does not show up right away. They do not cause painful sunburn, but their effects are very real and long lasting. They account for about 95% of all ultraviolet energy and release energy throughout the daylight hours. UVA's have the power do permanent damage to our DNA, as well as to the elastin and collagen fibers that make our skin firm and healthy. They can pass through all glass including windows, windshields, and sunglasses.

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UVB rays do burn your skin. Though they don't delve as deep into the skin's layers as UVA's, UVB's can damage the DNA at the heart of skin cells, and are a main cause of skin cancer. UVBs cant pass through glass but they do reflect off light colors such as sand, white decks, snow, etc.

http://vt.essortment.com/waystoprotect_rqgu.htm

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Increasingly, the medical community and consumer media are paying attention to the dangers of ultraviolet (UV) ray penetration into automobiles. Most people believe they are safe from the sun’s harmful UV rays whenever they are shielded by glass. In cars, however, UV protection is generally far from complete. The windows and windshield somewhat reduce exposure to UVB (short wave radiation between 290 and 320 nanometers) but only the windshield comes partially treated against UVA (long wave radiation between 320 and 400 nanometers) in the form of a plastic laminate. The other windows block little or none. Even factory installed solar tinted glass will only absorb less than ten percent of UV rays. This is important because UVA represents 90 percent of all UV radiation reaching the earth.

http://www.usglassmag.com/backissues/9905/9905uvconcerns.html

There are more sites I could quote. But while a large portion of UVb rays are blocked by glass.. no UVa rays are. And they make up a bulk of the UV rays hitting your car.