science

Phase-out of polystyrene foam

Phase-out of polystyrene foam is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Phase-out of polystyrene foam rather than just read about it. In short: In the late 20th and early 21st century, there has been a global movement towards the phase-out of polystyrene as a single use plastic (SUP). Early bans of polystyrene foam foam intended to eliminate ozone-depleting chlorofluorocarbons (CFCs), formerly a major component.

Key takeaways

Phase-out of polystyrene foam belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Phase-out of polystyrene foam to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Phase-out of polystyrene foam from memory before moving on to harder problems.

Reference excerpt

In the late 20th and early 21st century, there has been a global movement towards the phase-out of polystyrene as a single use plastic (SUP). Early bans of polystyrene foam foam intended to eliminate ozone-depleting chlorofluorocarbons (CFCs), formerly a major component. Expanded polystyrene, often termed Styrofoam, is a contributor of microplastics from both land and maritime activities. Polystyrene is not biodegradeable but is susceptible to photo-oxidation, and degrades slowly in the ocean as microplastic marine debris. Animals do not recognize polystyrene foam as an artificial material, may mistake it for food, and show toxic effects after substantial exposure. Full or partial bans of expanded and polystyrene foam commonly target disposable food packaging. Such bans have been enacted through national legislation globally, and also at sub-national or local levels in many countries.

Legislation around the world

National legislation China banned expanded polystyrene takeout/takeaway containers and tableware in 1999, but later revoked the policy in 2013 amidst industry lobbying. Haiti banned foam food containers in 2012 to reduce waste in canals and roadside drains. In 2019, the European Parliament voted 560 to 35 to ban all food and beverage containers made from expanded polystyrene throughout the European Union member states. Canada amended its 'Canadian Environmental Protection Act, 1999' in 2022 to prohibit foodservice ware made of expanded or extruded polystyrene, and also polyvinyl chloride, black colored plastics, or oxo-degraded plastics.

Summary

Subnational legislation In Australia, over 97% of the population live in an area that bans expanded polystyrene. Between 2021-2023, the Australian Capital Territory, New South Wales, Queensland, South Australia, Victoria, and Western Australia enacted bans. Nigeria's states of Lagos and Abia introduced bans in January 2024, with an initial transition period of three weeks. The state of Oyo introduced a ban in March 2024. Municipal bans in the Philippines are in effect in Bailen, Boracay, Caloocan, Cordova, El Nido, Las Piñas, Makati, Mandaluyong City, Muntinlupa, Quezon City, and Tacloban. In the United Arab Emirates, the municipal government of Dubai announced a ban affecting polystyrene in 2025, and all single-use plastic food containers in 2026. The national government enacted a ban in 2026.

Phaseout in the United States

As of June 2026, 12 U.S. states, the District of Columbia, and two territories have passed statewide legislation to explicitly ban polystyrene foam:

In 2019, Maryland was the first state to enact a ban, which went into effect on 1 October 2020. Bans were also passed that year in Maine and Vermont, with both states' laws taking effect on 1 July 2021. In 2020, New York passed a ban that took effect on 1 January 2022, while New Jersey passed a ban that took effect on 4 May 2022. In 2021, Colorado passed a ban that took effect on 1 January 2024. Virginia passed a ban on polystyrene food containers coming into force in July 2025 (for larger businesses) and July 2026 (for businesses with less than 20 locations). Washington also passed a polystyrene ban, effective starting in June 2023, with food serviceware prohibited starting 1 June 2024. In 2023, Delaware, Oregon and Rhode Island all signed bans into law. Provisions in Oregon and Rhode Island took effect on 1 January 2025, with Delaware's statute entering into force in July 2025. In 2025, California de jure banned polystyrene as a result of the state's legislature passing the Plastic Pollution Prevention and Packaging Producer Responsibility Act (SB54) in June 2022. The law codifies extended producer responsibility (EPR) requirements for plastics, including a requirement that polystyrene be banned if recycling rates do not reach 25% by 2025. Recycling rates averaged 6% at passage, leading some to call the law a 'de facto ban', anticipating an inability to comply. As a result, producers were restricted from selling, offering for sale, distributing, or importing EPS food service ware in or into California after January 1, 2025. CalRecycle, the state's recycling and waste management agency, implemented relevant regulations on May 1, 2026. Washington, D.C. banned polystyrene foam takeout containers on 1 January 2016. The ban was expanded on 1 January 2021, to include the retail sale of polystyrene foam. American Samoa banned the import, sale, and distribution of polystyrene foam containers on 6 February 2024, taking effect 60 days later. Puerto Rico banned the use, wholesale, or retail sale of polystyrene foam containers after enacting Law No. 51 of 29 June 2022. Later amendments delayed the operative date of the law from 2024 to 1 January 2027. In Hawaii, a de facto ban is in effect after every county enacted polystyrene bans except state-administered Kalawao County. Bans in Hawaii County took effect July 2019, followed by Kauaʻi County, Maui County, and Honolulu County in 2022. Maui separately banned polystyrene foam coolers, and the sale or rental of disposable bodyboards in 2022.

Local legislation Local bans have been enacted elsewhere, including in many large and small cities within the US:

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Phase-out of polystyrene foam

Start with the simplest possible case. Write down what Phase-out of polystyrene foam claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Phase-out of polystyrene foam before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Phase-out of polystyrene foam ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Phase-out of polystyrene foam

In research: Phase-out of polystyrene foam appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Phase-out of polystyrene foam in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Phase-out of polystyrene foam is common in secondary-school and first-year university syllabi. It links to neighbouring topics Environmentalism, Foams, Technological phase-outs, so understanding it makes those chapters shorter.
In everyday life: Look for Phase-out of polystyrene foam outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Phase-out of polystyrene foam in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Phase-out of polystyrene foam means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Phase-out of polystyrene foam out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Phase-out of polystyrene foam in simple terms?

Why does Phase-out of polystyrene foam matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Phase-out of polystyrene foam?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Phase-out of polystyrene foam.