Maya Ellison
Plastic is everywhere, from the food we eat to the clothes we wear. It is a complex material with a variety of types, each with unique properties. There are hundreds of types of plastic, but only a handful that humans interact with regularly. The seven most common types of plastic are numbered according to their recycling codes, with #1, #2, #4, and #5 being the safest and most recyclable. Polyethylene, for example, is the most common plastic globally, but it comes in three forms: high-density, low-density, and linear low-density. Other types of plastic include PVC, PET, and polypropylene, each serving different purposes and possessing distinct characteristics. While plastic has benefited humanity in numerous ways, understanding the potential harm of its various elements is crucial for making informed choices.
| Characteristics | Values |
|---|---|
| Number of Different Types of Plastic | 7 most common types, but hundreds in total |
| Plastic Number 1 | Recyclable, but potentially dangerous |
| Plastic Number 2 | Relatively safe, recyclable |
| Plastic Number 3 | Polyvinyl Chloride (PVC), not recyclable in most jurisdictions |
| Plastic Number 4 | LDPE, safe, but not environmentally friendly due to low recycling rates |
| Plastic Number 5 | PP, polypropylene, recyclable, second-most widely produced plastic |
| Plastic Number 6 | Must be avoided |
| Plastic Number 7 | Not recyclable, includes new plastics, bioplastics, and items composed of multiple types of plastics; contains BPA, which is dangerous |
| Polycarbonates | Used for eye protection, mobile phones, compact discs, greenhouses, DVDs, sunglasses, police riot gear |
| Polyethylene | Most common plastic in the world, can be manufactured in varying densities, classified into three types: High-Density, Low-Density, and Linear Low-Density |
| Polypropylene | Second-most widely produced commodity plastic, flexible, durable, heat-resistant, acid-resistant, cheap |
| PVC | Third-most produced synthetic plastic polymer, rigid or flexible, blends with other materials, not easily recyclable |
| PET | Fourth-most produced synthetic plastic, easily recyclable, shatterproof, high strength-to-weight ratio, used for food containers and liquid containers, clothing fibres |
| UHMWPE | High-density polyethylene, abrasion-resistant, used in military body armour, hydraulic seals, bearings, artificial ice skating rinks |
| Acrylic | Transparent, shatter-resistant alternative to glass, used in optical devices, can be made fluorescent, bullet-resistant, UV-tolerant |
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What You'll Learn
- Plastic is complex, with hundreds of types, but only a few are common
- Plastic is labelled with recycling numbers and symbols to help identification
- Some types of plastic are dangerous and should be avoided
- Plastic is rarely sold unadulterated and is mixed with additives
- Plastic recycling is complex and not all plastics are recyclable
Plastic is complex, with hundreds of types, but only a few are common
Plastic is all around us, from our television sets to our refrigerators. However, not all plastics are the same. There are hundreds of types of plastic, each with unique properties. The variety of plastics can be attributed to the different chemicals and additives blended to improve performance or appearance.
While there are hundreds of types of plastic, only a few are commonly used. These include Polyethylene Terephthalate (PET), Polyvinyl Chloride (PVC), Polypropylene (PP), and Polystyrene (PS). PET is the fourth-most produced synthetic plastic and is known for its excellent chemical resistance and high strength-to-weight ratio. It is commonly used in beverage bottles, food containers, and polyester clothing. PVC, on the other hand, is valued for its strength and durability and is often used in construction and plumbing. Polypropylene is the second-most widely produced plastic and is highly flexible, durable, and heat-resistant. It is used in a variety of products, from laboratory equipment to food containers.
Despite the benefits of these common plastics, they also have their drawbacks, particularly when it comes to recyclability. PET is easily recyclable, but other plastics, like PVC, are difficult to recycle due to the different additives used in their production. Number 7 plastics, which include polycarbonate (PC) and bioplastics, are especially problematic as they contain dangerous chemicals like BPA and are rarely recycled.
To make informed choices, it is important to understand the different types of plastics and their potential impact on health and the environment. Recycling symbols on plastic products, ranging from 1 to 7, can provide some guidance on recyclability, with plastics numbered 2, 4, and 5 considered safer options. However, it is worth noting that all plastic products can leach toxic chemicals when heated or damaged, so opting for alternative materials like metal or glass is advisable when possible.
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Plastic is labelled with recycling numbers and symbols to help identification
Plastic is a family of materials, with hundreds of different types, each with distinct qualities, uses, and recycling methods. The Society of the Plastics Industry introduced the Resin Identification Coding system in 1988, which assigns a number (1 through 7) to each type of plastic, known as the Plastic Resin Identification Code. These numbers are typically stamped on products, usually moulded at the bottom, to indicate the type of plastic used, allowing for proper identification and disposal.
The seven plastic recycling symbols, also known as the "chasing arrows" symbol, represent different types of plastics and provide specific recycling instructions. For example, Symbol 1, with the acronym PETE or PET, stands for polyethylene terephthalate, a clear, strong, and lightweight plastic commonly used for beverage bottles and food containers. This type of plastic is widely recycled and accepted by most curbside recycling programs.
Symbol 2, or HDPE, represents high-density polyethylene, a versatile plastic used for packaging and containers. It is lightweight yet durable and is readily recyclable into various products. Symbol 3, denoted by the letter "V," represents PVC or polyvinyl chloride, which is used in bubble foils, trays, and expanded PVC foam boards for commercial applications. PVC is not frequently recycled and is rarely included in curbside recycling programs.
Symbol 5, marked as PP, stands for polypropylene plastic, known for its durability, strength, and low weight. This plastic is used in furniture, luggage, toys, and car parts. It is increasingly accepted in curbside recycling programs. Symbol 6, or PS, represents styrene or polystyrene plastic, commonly found in toys, packaging, cosmetic bags, and vending cups. While not widely accepted in curbside recycling, it can be recycled into egg cartons, takeout containers, and rulers.
Finally, Symbol 7, labelled "OTHER," includes plastics such as acrylic, polycarbonate, polylactic fibres, nylon, and fibreglass. These plastics are not typically recyclable, but acrylic and polycarbonate can be recycled and repurposed. It is important to check with local recycling programs for specific guidelines on recycling these materials.
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Some types of plastic are dangerous and should be avoided
Plastic is everywhere, in practically everything we use daily. It is not all the same, however, and there are hundreds of types of plastic, or polymers, each with unique properties. While plastic has benefited humanity in some ways, some types are dangerous and should be avoided.
The seven plastic resin identifying codes denote different toxicity levels, with some plastics safer than others. Generally, codes 2, 4 and 5 are better than codes 1, 3, 6 and 7. Polyethylene terephthalate (PET), or #1 plastic, is relatively safe, but it is important to keep it out of high-temperature environments, as it can then release antimony trioxide and phthalates, which are dangerous to health. PET is found in beverage bottles, food jars, and polyester clothing.
Polystyrene (PS) is one of the most harmful types of plastic packaging. It is made up of multiple styrene molecules, and over fifty chemical byproducts are released during its manufacturing, contaminating the surrounding environment. Styrene is a known carcinogen and is linked to increased risks of cancers of the blood. It can also impact the nervous system and brain. PS is found in egg cartons, food packaging, disposable cutlery, and medicine bottles.
#3 PVC (polyvinyl chloride) and #7 PC (polycarbonate) plastics are considered among the most toxic plastics to produce and the most difficult to recycle. Their toxic components pose multiple health risks, including cancer, endocrine disruption, asthma, and allergies. PC often contains the highly dangerous BPA (Bisphenol A), which can affect estrogen hormones, sperm production, and chromosomes. PVC is found in toys, packaging, shampoo bottles, and construction materials, while PC is found in baby bottles, sports equipment, and medical devices.
While it is difficult to entirely avoid plastic, it is important to be aware of the different types and their potential dangers, opting for reusable alternatives and recycling where possible.
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Plastic is rarely sold unadulterated and is mixed with additives
Plastic is rarely sold in its pure, unadulterated form. It is usually mixed with various chemicals and materials, known as additives, to improve its lifespan, workability, and appearance. These additives are added during the compounding stage and can include stabilizers, plasticizers, and dyes. The compounding of thermosetting plastic is relatively simple, as it remains liquid until cured into its final form. However, for thermosoftening materials, which are used in most products, the plastic must be melted to mix in the additives. The concentrations of these additives are typically low, but higher levels can be added to create Masterbatch products with concentrated additives.
The use of additives in plastics has sparked controversy due to their potential environmental and health hazards. Some additives, such as octabromodiphenyl ether, pentabromodiphenyl ether, cadmium, chromium, lead, and mercury, are unsuitable for food packaging and have been banned in many places. However, they still find their way into plastic packaging, including those for food items. The unrestricted production and use of plastic additives have led to concerns about their ecological impact, with only 25% of plastic additives assessed for potential environmental harm.
The complexity of plastics and their additives contribute to the challenges of waste management and recycling. Improper disposal methods, such as landfill dumping, can lead to the release of toxic chemical additives into the environment. Plastic fragmentation into microplastics and nanoplastics further facilitates the spread of these chemicals. Sound recycling practices are crucial to mitigating these issues, ensuring the protection of the environment and human health.
The global production of plastic additives is projected to double by 2050, highlighting the urgency of addressing these concerns. With plastic production expected to exceed 1.1 billion tonnes annually by 2050, the environmental impact of plastic additives cannot be overstated. It is essential to restrict the use of toxic additives, develop eco-friendly alternatives, and establish comprehensive guidelines for the use of additives in plastics.
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Plastic recycling is complex and not all plastics are recyclable
Plastic is not a single material. There are hundreds of types of plastic, or polymers, that we interact with regularly. Plastic is so ubiquitous that it is practically impossible to avoid using or encountering it daily.
The different types of plastic have distinct properties, and this makes recycling plastic a complex process. Firstly, the plastic must be sorted according to its resin type. Then, it can be recycled either mechanically (by washing, grinding, and melting) or chemically (by breaking it down into monomers to form new polymers). However, not all plastics are recyclable. For example, polycarbonate, which is used in lenses for sunglasses, sports goggles, and CDs, is rarely recycled. PVC, despite being versatile and increasingly reusable, is also rarely recycled. LDPE, which is used in plastic bags, six-pack rings, and plastic wraps, is another plastic that is not often recycled.
The difficulty and expense of collecting and sorting plastic are barriers to recycling. In addition, the more plastic is reused, the more toxic it becomes, and new plastic is cheap and easy to produce. This means that recycled plastic has few markets. In fact, less than 10% of plastic has ever been recycled. The reality is that most plastic ends up in landfills, despite the efforts of waste management providers and governments to implement zero-waste policies.
The plastic industry has been aware of these difficulties since the 1970s but has continued to promote the message that plastic can and should be recycled. This has led to a public perception that plastic is being recycled when, in fact, it is not.
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