Depends mostly on the wavelength. UV of ~350-400nm Will pass through most plastics. But less than ~300nm would be absorbed. Here's some graphs of the transmission. http://usa.dupontteijinfilms.com/wp-content/uploads/2017/01/Mylar_Optical_Properties.pdf.
Polycarbonate makes a perfect plastic for a greenhouse because it blocks UV rays and lets in sunlight and heat. This type of plastic has light transmittance of 88%. Moreover, it can also be in clear and opaque shades. However, polycarbonate cannot be polished to restore its clarity. Polycarbonate can come in a few colors.IIRC the eye doc told me that UV rays are what cause the lenses to darken. EDIT>>>> How Do Photo Gray Lenses Work? In the glass or plastic used to make the glasses lens, silver halide is mixed in evenly. This substance is sensitive to ultraviolet light, and will darken when exposed to it. The drawback of this method is that thicker parts of a Before you build a sunshade, patio cover, or some other type of shelter, make sure you’ve chosen a tarp that blocks UV rays. These tarps protect against the damaging sun rays. #1 – Polyethylene Tarps: Poly tarps resist water and are UV treated. If you are looking to create an awning or another form of shelter, look into silver UVR heavy Forcefield - Uv Sunblock Fabric Protector - Prevent Uv Ray Damage - 22oz. PROTECTION - Protects fabrics, fibers and colored surfaces from the fading and damage caused by the Sun's rays. ABSORB - Absorbs the Sun's energy of UV radiation, and then releases it in a harmless form. SAFE - Safe to use on all types of materials including synthetics
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According to Subaru, their stock front and left windows block 99 percent UV penetration. The windshield blocks 100 percent UVB rays and less than 98 percent UVA rays. This article will discuss Subarus window engineering and how they block UV rays. The Danger of UV Rays. UV rays are incredibly dangerous for human health.
Scratch easily – A regular plastic lens is more susceptible to scratches due to daily wear. A scratch-resistant coating can be added for an additional cost. Partial UV protection – Plastic offers only partial protection from harmful UV rays. A UV coating should be added for 100% protection if you plan to wear the glasses outdoors.
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