17 Things You Thought Were Recyclable That Actually Aren't

Although pizza boxes are made from corrugated cardboard, which is recyclable, grease-soaked boxes with leftover food debris are not, as the paper fibres can't be separated from the food's oils during the pulping process.

Plastic bags are non-biodegradable, meaning they can take anywhere from 10 to 1,000 years to decompose.

Metal-wire hangers often get caught on recycling equipment, resulting in massive damage to the recycling system. Plastic and wood hangers are simply not recyclable.

Most power cords are made from recyclable copper or aluminium. However, because the metal is surrounded by a nonrecyclable insulating layer of plastic or rubber, most recycling companies won't accept power cords.

The ingredients of batteries make them dangerous items for recycling facilities. Rechargeable or lithium-ion batteries are particularly unwelcome as they pose the largest environmental concerns.

Related:

Here’s How to Recycle Batteries — Because Honestly, We’re All Wondering

Ceramics have a higher melting point than conventional glass, which is why most recycling facilities turn them away.

Bubble wrap is made of film, which is rarely accepted for curbside recycling since that type of plastic often gets wrapped up around other recyclables and stuck within machinery at facilities.

Any type of paper that's heavily dyed typically is heat-treated, which contaminates the paper and makes it nonrecyclable.

Plastic bottle caps and plastic bottles aren't made from the same material. Caps are made of a different, nonrecyclable type of plastic, so they can't be recycled with bottles.

Plastic straws are not only too small and thin but they bend too easily to be recycled. If they were to be recycled, they would constantly fall into the cracks of recycling machinery.

Plastic cutlery can take up to 1,000 years to decompose.

Most recycling facilities won't accept tires as they take up too much space. In addition, they can become hazardous if they trap methane gases.

Most snack bags are made of mixed materials, including polypropylene, which is nonrecyclable. Facilities often find it too difficult to separate the various plastic types.

Because garden hoses are so long and hard to control, they often get tangled within sorting machinery, causing damage to the machinery and endangering workers.

Because most toys are made of layers of different materials, they are difficult to recycle.