Plastics sold as "UV-resistant" are tested only for the lower-energy UVB since UVC does not normally reach the surface of the Earth. When UV is used near plastic, rubber, or insulation, these materials may be protected by metal tape or aluminum foil. Uses Air disinfection. UVGI can be used to disinfect air with prolonged exposure. UV transmission through greenhouse covers. Standard glass cover transmits 65 to 75 percent of UV-A but 3 percent or less of UV-B and UV-C. Most polyethyelene plastic film contain UV stabilizers treatment to retard their degradation, but stabilizers effects also degrade and will allow more UV transmission. Therefore, UV transmission will will UVA rays have a longer wavelength than UVB rays and are able to pass through clouds and glass. Although they are less intense than UVB, UVA rays account for up to 95% [ii] of the UV radiation that reaches the Earth’s surface. Due to its longer wavelength, UVA radiation penetrates to the deeper layers of the skin (dermal layers). An alternative is to treat the air, using UV-C light. That can take place above or below the ceiling tiles. For example, an emerging solution is combining UV-C light with electrostatic technology in one filter in an air handling unit (AHU). Or an in-room unit can circulate the air through a HEPA or other filter, then apply UV-C light. The spectral transmittances of these materials and the integrated transmittances in the UVB from 300 nm, UVA, visible (VIS) and near infrared ranges (NIR) were calculated. In summer in the UVB range from 300 nm methacrylate and smoked glass have the highest transmittance values (56%) and polycarbonate present the lowest (30%). Here is his message to me: I just took a few readings through some different kinds of "plastic." Costco/Kirkland plastic wrap was about 95% of full UVB. The recyclable plastic #1 blocked just about all UVB. #5 looked to be passing about 80% of the UVB. I believe the readings were taken using a Solarmeter 6.2 UVB meter. fNj9A4. Protecting your eyes from UV. To protect your eyes from harmful solar radiation, your should wear sunglasses that block 100 percent UV whenever you are outdoors in daylight. Your eyes need protection even on cloudy days because the sun's damaging UV rays can penetrate cloud cover. Sunglass frames with a close-fitting wraparound style provide Plexiglas® sheet absorbs short wavelength ultraviolet (UV) energy, but transmits most of the long wavelength UV (those wavelengths just short of the visible region). The total uv energy absorbed is about 65%. This unsurpassed UV stability gives Plexiglas® MC and G sheet superb weatherability and makes it the logical choice among plastic The change in the plastic's composition is evident in the laboratory, but "visually, it may not appear to have changed much during the process". The rate of degradation is light intensity-dependent, but under the team's laboratory conditions the polymer chain lengths degraded to a quarter of their original length after 30 days of exposure. 300 nm and 400 nm to pass through while reflective and tin ted glasses have less transmission LLDPE materials were established to be transparent to both UVB and UV A, while PET plastic bottles 1. In physics, the reflectivity of a surface is described by Fresnel Equations. One of the parameters of this equations is the refractive index which in general depends on the wavelength of light used. So surfaces that reflect visible light need not be good reflectors in another wavelength. A very good example of this is the phosphorescent Unfortunately the answer is a yes – UV rays do come through glass and can still cause you damage. That said though, it does block some of the sun’s rays depending on their wavelength…. Specifically windows will block all of the ‘UVB’ while still letting ‘UVA’ come through. UVB is the ‘shorter wave’ light and is what’s

can uvb pass through plastic