Poly sheets with ultraviolet light inhibitors last 10 to 12 years before they need to be replaced

Plastic is mostly decomposed by UV radiation, and it takes two years to more than 1 million years to decompose it. While many pure plastics cannot absorb UV radiation, the presence of catalyst residues and other impurities will often act as receptors

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this is a good question! i'll do some research and come back when i have the answer!