Found this on a GE sight which may answer why you cannot keep your plastic trim, Headlights etc. from decaying. I have recently started using Optimum Spray wax on top of Collinite products as it claims to block both of these UV types. So far it has had promising results and as with everything time will tell.
What’s the difference between UVA and UVB?
UVA is ultraviolet radiation between 400-320nm wavelength and UVB is between 320-290nm wavelength. The shorter the wavelength, the higher the energy of radiation. UVA rays account for 90 to 95% of UV radiation that reaches the earth. While UVB makes up only 5-10% of solar radiation, its high energy damages surface epidermal layers and causes sunburn. UVB is strongest between 10AM and 4PM, from April to October and do not significantly penetrate glass. UVA is present equally throughout the daylight hours and throughout the seasons, and can penetrate cloud and glass.
Dave
What’s the difference between UVA and UVB?
UVA is ultraviolet radiation between 400-320nm wavelength and UVB is between 320-290nm wavelength. The shorter the wavelength, the higher the energy of radiation. UVA rays account for 90 to 95% of UV radiation that reaches the earth. While UVB makes up only 5-10% of solar radiation, its high energy damages surface epidermal layers and causes sunburn. UVB is strongest between 10AM and 4PM, from April to October and do not significantly penetrate glass. UVA is present equally throughout the daylight hours and throughout the seasons, and can penetrate cloud and glass.
Dave
