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Should caps be removed from or left on bottles? Are caps and neck rings contaminants?

April 26, 2017bottles caps contaminants Left neck removed Rings

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Should caps be removed from or left on bottles? Are caps and neck rings contaminants?

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Bottle caps and neck rings are typically made of polypropylene plastic which has a different specific gravity than PET. This difference allows caps and neck rings to be mechanically removed in a float/sink process and recycled. Although most caps and neck rings are not a contaminant to the PET recycling process, in some cases, removing them will help with compaction.