UV rays can pass through clouds and glass. To see whether car windows are protective, Boxer Wachler took a UV-A light meter to a number of Los Angeles car dealers on a cloudless May day in 2014. SC7050-UVB. Crystal clear coating. UV-A and UV-B blocking for protection over coatings and plastics. Fluorinated for proven UV stability. Outstanding moisture resistant & barrier. Outstanding adhesion to metals, woods, stones and ceramics. Insulating >10 14 ohm-cm. >10 ppi. >#2H pencil scratch resistance. With the right material (lead) or with the right thickness for any material you are able to capture X-rays inside the material. On the other hand, you are able to transmit visible light even through metal. It's all about thickness. Gold or aluminum can be made so thin that light can pass through it. Research shows that standard glass can block up to 90% of UVB rays, which is a significant concern for reptile owners. On the flip side, mesh and screen enclosures allow a greater percentage of UVB to pass through but can scatter the rays, reducing their effectiveness. 2. What the Experts Say This material in sports eyeglasses can provide extra eye protection. Also, it can cut the risk of UV radiation causing long-term damage. Polycarbonate lens provides nearly 100% UV protection. To give you a good comparison, non-coated plastic sunglasses only block about 88%. Whereas triacetate only filters 40% of UV (this material is often CR-39 which stands for Columbia resin #39 is the most commonly used plastic polymer lens material. The lenses block 80% of ultraviolet light without treatment, and can be tinted and coated to provide further ultraviolet light blocking. Plastic lenses tend to have a lower index of refraction, which require thicker lenses. Can UV pass through plastic? Long wave UV passes easily through plastic and glass. Unlike long wave UV, the short wave UV cannot pass through ordinary glass or most plastics. The shortest wavelengths cannot even travel very far through the air before being absorbed by oxygen molecules as they are converted into ozone. In other words, more of the incident UVA and UVB photons are reflected away from the surface rather than being transmitted through the sample. Furthermore, UVA and UVB photons can be hindered internal to the sample by internal scattering from small grains close to the size of the incident wavelengths. vTdO.