Chloe Zhang
Plastic is everywhere, from our refrigerators to our cars. However, not all plastics are created equal. There are dozens of different types of plastics, each with unique properties. For example, some plastics are shatter-resistant, while others are highly flexible. Some are safe, while others are dangerous. Understanding the different types of plastics and their respective recycling codes is crucial for making informed decisions about the products we buy and use. With plastic consumption continuing to rise, it is essential to choose safer and more environmentally friendly alternatives whenever possible.
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What You'll Learn
Plastic types and their recycling capabilities
Plastic is everywhere, from our computers to our cars, refrigerators, and houses. However, not all plastics are made alike. There are several different types of plastics, each with unique properties.
Polyethylene Terephthalate (PET)
PET is the fourth-most produced synthetic plastic and is easily recyclable. It has excellent chemical resistance to organic materials and water and is practically shatterproof. PET is used in food and liquid containers, fibres for clothing, and engineering resins.
Polyvinyl Chloride (PVC)
PVC is the third-most produced synthetic plastic and can be manufactured to be rigid or flexible. It is well-known for its ability to blend with other materials and is often used in construction materials, bottles, and non-food packaging. However, PVC is challenging to recycle due to the different additives used, and should be avoided when possible.
Polypropylene (PP)
PP is the second-most widely produced plastic and is known for its flexibility and durability. It is resistant to repeated stress and is used in laboratory equipment, automotive parts, medical devices, and food containers. PP is recyclable and falls under recycling code #5.
Polystyrene (PS)
PS can be solid or foamed and is a very inexpensive resin. It is easy to create and can be found in beverage cups, insulation, packing materials, disposable dinnerware, and egg cartons. PS is highly flammable and dangerous as it can leach harmful chemicals when heated. It is not biodegradable and is not often recycled.
Acrylic
Acrylic is a transparent thermoplastic used as a lightweight, shatter-resistant alternative to glass. It can be made in various forms, such as coloured, fluorescent, abrasion-resistant, bullet-resistant, and UV-tolerant. Acrylic is commonly used in sheet form to create products like mirrors and plexiglass.
Polycarbonate
Polycarbonate is a tough, stable, and transparent engineering plastic that is two hundred and fifty times stronger than glass. It is easily worked, moulded, and formed, and possesses inherent design flexibility. Polycarbonate is used in a wide variety of products, including greenhouses, DVDs, and sunglasses.
Biodegradable Plastics
Biodegradable plastics are designed to degrade much faster than traditional plastics. While they can be made from bioplastics, they may also be derived from fossil fuels and petroleum, which raises sustainability concerns. Biodegradable plastics are typically not compostable, but bioplastics may be depending on their source.
Plastic Recycling
Understanding the different types of plastics and their recycling capabilities is crucial for making informed choices about the products we use and buy. Recycling codes on plastic products, usually numbers within a triangle, indicate the type of plastic and its recyclability. Codes 1, 2, and 5 are easy to recycle, while codes 3 and 6 are more challenging to recycle and should be avoided when possible. Code 7 plastics are the most difficult to recycle and include bioplastics and items composed of multiple plastic types.
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Plastic additives and their impact on performance
Plastic additives are substances added to plastics during the manufacturing process to enhance specific properties and improve performance. They can alter characteristics such as strength, flexibility, UV resistance, colour, and flame retardancy. These additives allow plastics to be used in a wide range of applications, including packing materials, automobile components, medical equipment, and household items.
One example of an additive is fillers, which enhance the performance characteristics of plastics. Fillers can increase the bulk density and stiffness of recycled plastics by filling gaps and voids, thereby reducing the amount of costly resin required. Fillers also improve the strength and stiffness of the final product, making it more impact-resistant.
Another important additive is stabilizers, which prevent or slow down the degradation of plastics caused by heat, light, or oxygen exposure. Antioxidants, for instance, preserve the strength and lifespan of plastics by scavenging free radicals formed during processing and degradation. UV stabilizers, on the other hand, prevent degradation when plastics are exposed to light, protecting against discolouration and structural weakening.
Plasticizers are additives that improve the flexibility and elasticity of plastics by reducing their intermolecular forces. They can be added during the processing of plastics to enhance their performance in specific applications.
While additives offer numerous benefits, they can also create challenges for recycling. The presence of additives can impact the recyclability of plastics, and their potential to contaminate soil, air, water, and food is a significant concern. Therefore, it is essential to consider the effects of additives on recycling and human health when designing, manufacturing, using, and disposing of plastic products.
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Plastic microbeads and their environmental harm
There are seven distinct types of plastic, each with unique properties. Polyethylene, for instance, is the most common plastic on Earth, while polypropylene is the second most common. Polycarbonate, on the other hand, is an engineering plastic that is 250 times stronger than glass. Acrylic is a shatter-resistant alternative to glass, while PVC is a versatile plastic that can replace traditional building materials. Polystyrene, also known as Styrofoam, is inexpensive and lightweight, but it is highly flammable and dangerous when heated. Finally, UHMWPE is an abrasion-resistant plastic used in military body armor and medical implants.
Despite their convenience and versatility, plastics pose significant environmental challenges, particularly in the form of plastic microbeads. These microbeads are tiny plastic particles, typically less than one millimeter in size, that are added to various products for their exfoliating or abrasive properties. They are commonly found in rinse-off cosmetics, personal care items, and cleaning products. Unfortunately, when these products are washed down the drain, the microbeads often pass through wastewater treatment systems and end up in rivers, lakes, and oceans.
Once in aquatic environments, microbeads can have detrimental effects on marine life, the ecosystem, and even human health. They are mistaken for food by various animals, from small fish to birds, leading to the ingestion of toxic chemicals. These microbeads attract hydrophobic pollutants like polychlorinated biphenyls (PCBs) and dichlorodiphenyltrichloroethane (DDT), which can then be transferred up the food chain. The presence of microbeads in the water also contributes to plastic pollution, creating an ecological crisis that current cleaning methods are ill-equipped to address.
Recognizing the harm caused by plastic microbeads, several countries have taken steps to address the issue. The Microbead-Free Waters Act of 2015 in the United States, for example, phased out microbeads in rinse-off cosmetics by July 2017. Canada, France, New Zealand, Sweden, Taiwan, and the United Kingdom have also banned microbeads from such products. Additionally, voluntary industry phase-outs have been led by organizations like Accord Australasia through their BeadRecede campaign, with the support of government departments. These efforts reflect a growing awareness of the environmental and health risks associated with plastic microbeads and a commitment to finding alternative abrasive ingredients.
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Biodegradable plastics and their sustainability
Plastic is everywhere, from televisions and cars to refrigerators and houses. However, not all plastics are created equal, and some are far more harmful to the environment than others.
Biodegradable plastics are those that degrade naturally over time. They are designed to have a smaller environmental footprint and can possess similar properties to traditional plastics. They can be tested to ensure they break down under controlled conditions in a lab, including factors like oxygen levels, UV exposure, and temperature. However, nature does not have controlled conditions, so it is challenging to determine if biodegradable plastic will biodegrade in the natural world if littered.
The demand for eco-friendly materials is increasing to reduce waste management and pollution issues. Biodegradable plastics can play a role in reducing waste, but they are not a silver bullet solution to the plastic pollution crisis. All plastic, including biodegradable types, must be collected and paired with the right recovery systems to keep them out of nature.
Academic and industry interest in biodegradable plastics for sustainability has surged in recent years, with researchers analyzing their sustainability through economic profit, social responsibility, and environmental protection. The economic component has been found to be the most important element, followed by environmental effects and social attitudes.
While biodegradable plastics have the potential to reduce environmental impact, it is crucial to understand their entire life cycle and manage their waste appropriately, such as through composting, to ensure they deliver on their sustainability promise.
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Plastic types and their safety for human health
Plastic is everywhere, and it comes in many different forms, each with its own unique properties. Some plastics are safer than others, and it is important to understand the potential health risks associated with the various types of plastics.
One of the most well-known and dangerous chemicals found in plastic is Bisphenol A (BPA), an endocrine disruptor. It is prevalent in a wide range of products, including plastic food and beverage containers, metal can linings, and polycarbonate water bottles. Heat, repeated washing, acidity, and alkalinity cause BPA to leach from plastics into our food and drinks. It has also been detected in groundwater and the ocean, which means we ingest it from fish and other seafood. BPA has been linked to various health issues, including obesity, cancer, and endocrine problems in children and fetuses.
Polystyrene, often known by its commercial name, Styrofoam, is another plastic that poses health risks. It is commonly used for beverage cups, disposable containers, and foodware. It is highly flammable and dangerous when heated, as it can leach harmful chemicals.
Polyvinyl Chloride (PVC) is another commonly used plastic with health concerns. It is known for its versatility and ability to blend with other materials, but it is challenging to recycle due to its various additives. PVC contains phthalates, another class of endocrine disruptors, which are used to soften plastic. Phthalates have been linked to adverse effects on male reproductive health and cognitive and behavioral issues in children.
Some plastics are considered safer than others. Polyethylene Terephthalate (PET or PETE), commonly known as #1 plastic, is relatively safe and easily recyclable. However, it should be kept away from heat to prevent the leaching of potential carcinogens. Polypropylene (PP), often labelled as #5 plastic, is also considered safe for use, including in microwave-safe containers, although it is always best to use glassware when possible. LDPE, or #4 plastic, is another relatively safe plastic, but it is not very environmentally friendly due to low recycling rates.
While some plastics are safer than others, it is important to remember that all plastic products can leach toxic chemicals when heated or damaged. Therefore, it is advisable to opt for alternative materials like metal, glass, bamboo, or other reusable and environmentally friendly options whenever possible.
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Frequently asked questions
Yes, there are hundreds of different types of plastic, also called polymers.
The two main types of plastic are thermoplastics and thermosets.
Polyethylene terephthalate (PET), high-density polyethylene (HDPE), and polypropylene (PP) are some examples of thermoplastics.
Polyvinyl chloride (PVC) is an example of a thermoset.
You can identify the type of plastic by looking for a number at the back or bottom of a plastic product. This number indicates the type of plastic.
