Why You Should Leave the Cap On
Many people assume that removing bottle caps makes recycling easier for workers. But modern recycling facilities are designed to handle bottles with caps attached.
Once plastic bottles are ground up, they go through a water bath. The bottle itself (usually made from PET plastic) sinks, while the cap—typically made from high-density polyethylene (HDPE) or polypropylene (PP)—floats. This makes it easy for recycling facilities to separate and process the materials correctly.
Leaving the cap on actually helps prevent sorting problems and keeps small plastic pieces from being lost in the system.
Bottle Caps Often End Up in the Ocean
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