Understanding Non-Recyclable Plastics: What's Not Going Green?

what plastics are non recyclable

Plastic waste is a pressing issue for environmentalists, governments, and organisations, as the vast majority of plastics are disposed of in non-environmentally friendly ways, leading to polluted oceans, overfilled landfills, and ecological damage. While recycling plastic is crucial for improving waste management and the environment, not all plastics are recyclable. The recyclability of plastic types depends on how they are made; thermoset plastics, for instance, contain polymers that form irreversible chemical bonds and cannot be recycled, while thermoplastics can be remelted and remolded. Examples of non-recyclable plastics include bioplastics, composite plastic, plastic-coated wrapping paper, polycarbonate, and thin plastic bags. Additionally, certain plastic items, such as plastic utensils, containers, and medical waste, are not recyclable due to contamination, size, or the presence of hazardous substances.

Characteristics Values
Type Thermoset plastics, bioplastics, composite plastic, plastic-coated wrapping paper, polycarbonate, cling film, blister packaging, plastic bags, plastic straws, plastic cups, plastic tubes, plastic knives, forks, and spoons, plastic trays, polystyrene foam, prescription bottles, plastic hazardous substance containers, plastic medical waste
Composition Polymers that form irreversible chemical bonds
Reasons for Non-Recyclability Too small, heavily contaminated with food or hazardous substances, made from low-value plastic resins, contains traces of medications
Disposal Method Trash

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Thermoset plastics

The non-recyclability of thermoset plastics has become a pressing issue, with millions of tons of products, such as polyurethanes and epoxies, ending up in landfills each year. However, researchers from institutions like MIT are working to address this problem by developing innovative solutions. For instance, MIT researchers have created a degradable version of a thermoset plastic called pDCPD, which can be broken down into a soluble powder upon exposure to fluoride ions without compromising its mechanical strength.

While the development of recyclable thermoset plastics is ongoing, the current challenge lies in the limited infrastructure for recycling these materials. The recycling structures in place are primarily designed for thermoplastic materials, which can be easily remelted and reshaped. Thermoset plastics, on the other hand, require more complex and energy-intensive processes for recycling, making it challenging to implement these methods on a large scale.

To conclude, thermoset plastics are non-recyclable due to the irreversible chemical bonds formed during their curing process, making them difficult to remelt and remould. This property, which gives them their strength and stability, also poses challenges for recycling. Ongoing research has led to the development of recyclable thermoset plastics, but the implementation of these solutions is hindered by the limited infrastructure currently in place.

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Plastic hazardous substance containers

There are many types of plastic that are non-recyclable. This includes bioplastics, composite plastic, plastic-coated wrapping paper, and polycarbonate. Cling film and blister packaging are also well-known examples of non-recyclable plastics. These types of plastic are often not collected by kerbside recycling programs due to the risk of clogging the machines if thin plastics are not separated properly.

The recyclability of plastic types depends on how they are made. Thermoset plastics, for example, contain polymers that form irreversible chemical bonds and cannot be recycled, unlike thermoplastics, which can be remelted and remolded. Thermoset plastics include epoxy, phenolic, unsaturated polyester, and urethane. They are advantageous due to their strength and heat resistance but cannot be recycled or reused.

Despite the non-recyclability of certain plastics, it is important to explore alternatives to landfill disposal. Some recycling companies can recycle a full range of waste, from everyday household materials to commercial and industrial waste. This helps to reduce the amount of plastic waste that ends up in landfills and causes ecological damage.

Additionally, some animal shelters accept empty prescription medication bottles for donation, as they can be reused for animal medications.

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Plastic tableware

Most plastic containers with recycling codes 1 and 2 are widely accepted by recycling programs. These include items like beverage bottles, milk jugs, and some food containers. However, plastics with codes 3 to 7, including low-value plastic resins and heavily contaminated items, can be challenging to recycle and may not be accepted everywhere.

Single-use plastic tableware, such as disposable cups, plates, and cutlery, often falls into the non-recyclable category. These items are made from low-value plastic resins and are heavily contaminated with food, making them unsuitable for recycling. Additionally, plastic straws, plastic tubes from toothpaste or lotion, and Styrofoam containers should be disposed of in the trash as they are also non-recyclable due to food contamination and low-value resins.

Some specific types of plastic tableware and their recyclability include:

  • IKEA’s plastic plates: Made from polypropylene (PP), a petroleum-based plastic. While recycled plastic plates are a more sustainable option, virgin plastics are still widely used, impacting the environment through the extraction and refining of oil.
  • PLA plastic tableware: Derived from renewable resources like corn starch. These containers are compostable under industrial conditions, making them environmentally friendly by reducing reliance on fossil fuels and greenhouse gas emissions.
  • Melamine tableware: Technically recyclable as Type 7 plastic, but access to recycling facilities is limited, often requiring disposal as general waste.

To reduce the environmental impact of plastic tableware, reusable options are always preferable to disposables. Sourcing secondhand or preloved tableware, choosing recyclable or recycled plastic tableware, and supporting local manufacturers can also help minimize waste and conserve natural resources.

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Plastic straws

The issue of plastic straw waste is significant, with 500 million straws discarded daily in the United States alone, weighing 1.4 million kg. This is enough to equal the weight of about ten blue whales every day. Plastic straws are also a global issue, frequently ending up in rivers and oceans, where they harm marine life and release toxic chemicals. It is estimated that by 2050, there will be more plastic in the ocean than fish, and plastic debris is already affecting marine animals and humans alike.

To address this problem, many individuals are choosing to reduce or eliminate their use of plastic straws. Some people are opting for reusable alternatives made from materials like metal, bamboo, or glass, which are easy to carry and can be cleaned in the dishwasher. Businesses are also taking steps to reduce straw consumption, with some offering compostable or recyclable straws only upon request, or removing straws from their premises entirely. These efforts are crucial in reducing plastic pollution and its impact on the environment and human health.

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Plastic bags

To recycle plastic bags, you can take them to participating retail store recycling bins. All recycling is local, so it is important to check with your local recycling entity to ensure you are recycling correctly.

There are many benefits to recycling. Plastic is beneficial because it extends the lifetime of non-renewable resources like petroleum, and it does not cost very much to recycle. Recycling as much as possible helps to lower the use of virgin materials and extend their lifetime, which helps the environment.

Frequently asked questions

Thermoset plastics, such as epoxy, phenolic, unsaturated polyester, and urethane, are non-recyclable due to their irreversible chemical bonds. Other non-recyclable plastics include bioplastics, composite plastic, plastic-coated wrapping paper, and polycarbonate.

Plastic hazardous substance containers, such as automotive fluids, pesticides, and drain cleaners, are non-recyclable. Plastic items used for personal hygiene, such as diapers and feminine hygiene products, and medical waste like syringes, are also non-recyclable and should be disposed of in the trash. Additionally, plastic cutlery, straws, cups, and food containers are often non-recyclable due to food contamination and the use of low-value plastic resins.

Plastic bags can get caught in the machines at recycling facilities, causing operational issues. They require special collection systems and processing equipment that most regional recycling programs do not offer. It is recommended to reuse plastic bags or return them to a local grocery store for reuse.

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