Why can't different types of plastic be recycled together?

Answer: Different plastics don't melt together into a strong material

Different plastics don't melt together into a strong material ✓ — Correct! Plastics differ in chemical structure and melting point. When different types are melted together, they can form a weak, unusable material. That is why recycling depends on sorting by type, and many products contain multiple plastics that are hard to separate.

Recycling centers lack machines for every plastic type — Wrong. Equipment is part of recycling, so this sounds plausible. But the central limitation is that different plastics do not share the same melting behavior and do not blend into strong recycled material. Better sorting and machines help, but they do not make mixed plastics melt into one good material.

All plastics can be recycled if cleaned and sorted — Wrong. Cleaning and sorting do help with accepted plastics, so this captures part of the truth. But only certain plastics are widely recyclable, and many are not economically recyclable because of mixed composition or contamination. Not every plastic item can go back into recycling just because it is clean.