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.
How does UV affect plastic?
What does UV radiation actually do to degrade plastics? All types of UV can cause a photochemical effect within the polymer structure, which can lead to degradation of some sort to the material. The higher energy UVC is the type most likely to affect plastics. Absorbed UV energy can excite the photons in a plastic.
Can UV pass through acrylic?
Most acrylic plastics will allow light of wavelength greater than 375 nm to pass through the material, but they will not allow UV-C wavelengths (100–290 nm) to pass through. Even very thin acrylic sheets of less than 5 millimeters (mm) do not let UV-C light penetrate.
Is plastic UV resistant?
Certain plastics such as acrylic, Ultem®, PVDF, and PTFE are inherently UV stable. However, most plastic materials exhibit color change and loss of elongation when exposed to UV light. Weathering resistance of some plastics can be improved by adding UV stabilizers or UV resistant caps to protect the base polymer.
Can UV pass through clothes?
When you are out in the sun, wear clothing to cover your skin. Clothes provide different levels of UV protection. Be aware that covering up doesn’t block out all UV rays. If you can see light through a fabric, UV rays can get through, too.
Photo in the article by “Flickr”