Save the Fish
Plastic cups and plates: how long does it take to break down in the sea?
Estimated time to break down in the sea: > 450 years. Source: Canadian Geographic Education (cangeoeducation.ca). No source gives a figure for plastic plates, so we use the figure for a plastic party cup.
Plastic cups and plates: why is it harmful to the sea?
Top-ten beach litter; breaks into sharp bits and microplastics.
Plastic cups and plates: does it really disappear?
No. Plastic breaks into smaller and smaller pieces, microplastics, that stay in the water and inside animals. NOAA says plastic may never fully go away.
Plastic cups and plates: how harmful is it compared with other trash?
Harm score 7 out of 10: lasts 4/4, toxic 2/3, wildlife 1/3. It ranks 9 of 31 on our list. This score is our own simple scale for comparing items in the game. It is not an official index.
Plastic cups and plates: what is it made of?
Material: Plastic. A typical one is about 18 cm long and weighs about 10 g.
Plastic cups and plates: what can I do?
Carry a bottle, a cloth bag and a box: every single-use plastic you refuse is one less in the sea.
Plastic cups and plates: what lasts longer, and what breaks down sooner?
Lasts longer: Disposable diaper, Face mask, Plastic bottle. Breaks down sooner: Plastic straw, Plastic cutlery, Cotton swab.
Plastic cups and plates: where does this figure come from?
From “Decomposition Rates card”, Canadian Geographic Education (figures credited to NOAA, US EPA and Woods Hole Sea Grant). Checked on 2026-10-15.
The source says“Party cup 450 years”The source's limits (in English): Time 'to break down in the ocean'. Party cup figure, used for plates (no plate-specific figure found).