Why aren’t all types of plastics recyclable?
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Anything is recyclable with enough chemistry, the question is whether it’s economically recyclable.
With metals, the initial cost of extraction is higher, and the process of re-melting tends to burn off many impurities.
There are a lot of different kinds of plastic, and the time it takes to identify what a single piece of plastic is made of can easily be worth more than the plastic is worth. If you miss a piece of the wrong type of plastic, you can clog up the manufacturing equipment, when it chokes on a chunk of plastic that won’t melt.
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