Omar Khalid
Plastic is everywhere, from food containers to packaging, and it is important to understand the different types of plastic and their potential harm to our health and the environment. The seven types of plastic are differentiated by a recycling symbol, designed by the Society of the Plastics Industry (SPI) in 1988, which is a triangle of arrows with a number from 1 to 7 inside. Group 7 plastics are those that cannot be identified as one of the six types above and are seldom recycled, with some sources stating they are almost never recycled. This group includes polycarbonates (PC), which are used to make products that are strong and tough, such as lenses for sunglasses and sports goggles, as well as mobile phones and compact discs.
| Characteristics | Values |
|---|---|
| Plastic Number | 7 |
| Plastic Type | Polycarbonates (PC) |
| Plastic Name | Group 7 Plastics |
| Common Uses | Eye protection, lenses for sunglasses, sports and safety goggles, mobile phones, compact discs (CDs) |
| Recyclability | Seldom recycled, placed in regular waste streams (landfilled or incinerated) |
| Safety | Contains BPA, a highly toxic chemical linked to obesity, cancer, and endocrine problems in children |
| Other Characteristics | Resistant to high temperatures, releases hazardous materials when heated |
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What You'll Learn
Group 7 plastics are seldom recycled
Plastics are everywhere, from food containers to packaging, sports equipment, medical devices, and DVDs. The ubiquitous material is classified into seven types, each denoted by a number inside a triangle of chasing arrows, also known as the resin identification code. This code provides information about the type of plastic and its recyclability. However, it is important to note that the presence of a recycling symbol does not guarantee recyclability; it merely indicates the possibility of recycling.
Group 7 plastics, also known as "Other plastics," include all plastics that cannot be identified as one of the first six types. This group contains a diverse range of materials, from bioplastics and composite plastics (like crisp wrappers) to plastic-coated wrapping paper and polycarbonate. Polycarbonate (PC) is one of the best-known plastics in this group, used for its strength and toughness in products like eye protection, lenses for sunglasses, sports and safety goggles, mobile phones, and compact discs (CDs).
Despite the wide range of uses, Group 7 plastics are seldom recycled. They often end up in regular waste streams and are landfilled or incinerated. This is partly because they are difficult to recycle and require more advanced technology and facilities for processing. Additionally, the recycling of Group 7 plastics may release hazardous materials, contributing to environmental concerns.
The classification of plastics helps consumers and recyclers differentiate between types, but it also highlights the challenges of recycling certain plastics. While some plastics, like PET (Polyethylene Terephthalate) and HDPE (High-Density Polyethylene), are more commonly recycled, Group 7 plastics often fall outside the capabilities of municipal recycling centers. This discrepancy underscores the need for continued research and innovation in recycling technologies to address the diverse and complex nature of Group 7 plastics.
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Polycarbonates are a type of group 7 plastic
Group 7 plastics are a complex group that includes all plastic types except for numbers 1 to 6. This group contains a wide range of plastics with varying characteristics, including recyclable, non-recyclable, mixed plastics, and biodegradable plastics. One of the most common plastics in this category is polycarbonate, also known as PC.
Polycarbonates are thermoplastics made from polymers with carbonate groups in their structure. They possess valuable properties such as translucence, impact resistance, and pliability at room temperature, making them easy to work with for manufacturers. This type of plastic is an excellent alternative to glass, especially with its natural UV filter, which is why it is commonly used in windows and eyewear. Polycarbonate is also used in CDs, mobile phones, and electrical object housings.
However, polycarbonate has come under scrutiny due to its association with bisphenol A (BPA), a hazardous substance that can be released from the plastic. Several countries have banned the use of polycarbonate in baby bottles and infant formula packaging due to the health risks associated with BPA exposure, including chromosome damage and behavioral changes. Despite its advantages, the controversy surrounding BPA has led to a decrease in the use of polycarbonate in recent years.
Polycarbonate is not typically recycled through curbside pickup and requires specialist recyclers. This is a common issue with Group 7 plastics, as most of them cannot be recycled through regular channels. The complexity of Group 7 plastics highlights the importance of opting for reusable alternatives and recycling plastics whenever possible to minimize their environmental impact.
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Group 7 plastics can leach hazardous materials
Group 7 plastics encompass a wide range of materials, including polycarbonate (PC) and polystyrene, which are known to leach hazardous substances under specific conditions. While polycarbonate is commonly used in products like sunglasses, goggles, mobile phones, and compact discs, its potential for leaching has sparked controversy. On the other hand, polystyrene, often recognised by its commercial name, Styrofoam, is prevalent in disposable cups, containers, and cutlery.
Polystyrene has been identified as a neurotoxin and possible carcinogen, capable of leaching harmful chemicals, especially when heated. This poses a significant risk, as people often microwave polystyrene containers to heat their food. Additionally, polystyrene is not typically accepted by recycling programs, leading to its accumulation in the environment.
Polycarbonate, on the other hand, has been controversial due to its tendency to release hazardous substances at high temperatures. This leaching of chemicals can have detrimental effects on both human health and the environment. It is important to note that not all Group 7 plastics are inherently dangerous, but the potential for leaching hazardous materials exists within this diverse group.
Furthermore, Group 7 plastics, including polycarbonate and polystyrene, are seldom recycled and often end up in landfills or incinerated. This contributes to environmental pollution and the persistence of harmful chemicals in the ecosystem. The decomposition of these plastics does not occur naturally, leading to the persistence of toxic chemicals in the soil and their eventual seepage into water bodies.
While some plastics within Group 7 might be safer than others, it is always advisable to opt for alternatives like glass, stainless steel, or lead-free ceramic for storage containers. Additionally, choosing wooden or cloth toys for children can help reduce their exposure to toxic chemicals found in some plastic products.
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Group 7 plastics are hard to identify
The recycling symbol on plastic products, which consists of a number from 1 to 7 enclosed in a triangle of arrows, is meant to provide information about the type of plastic used and its recyclability. However, the presence of a recycling symbol on a plastic product does not necessarily mean that it can be recycled. The symbol only indicates the potential for recycling, and the actual recyclability depends on various factors, including the availability of specialised facilities, technology, and funds.
Group 7 plastics are a catch-all category for plastics that do not fall into the first six types. This group includes polycarbonates (PC), which are used to create strong and durable products like eye protection, lenses for sunglasses, sports and safety goggles, mobile phones, and compact discs (CDs). However, polycarbonates have come under scrutiny due to concerns about the leaching of chemicals at high temperatures.
Identifying Group 7 plastics can be challenging because they are not always clearly labelled, and consumers may not be aware of the specific types of plastics that fall into this category. Additionally, Group 7 plastics are not widely accepted by recycling programs and are often placed in regular waste streams, contributing to landfill waste or incineration.
To address the challenge of identifying and recycling Group 7 plastics, it is essential to stay informed about the latest advancements in recycling technologies and the capabilities of local waste recycling facilities. While reducing plastic consumption and opting for reusable alternatives is ideal, understanding the different types of plastics and their potential hazards is crucial for making informed decisions when purchasing plastic products.
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Group 7 plastics are not all the same
The recycling symbol, designed by the Society of the Plastics Industry (SPI) in 1988, allows consumers and recyclers to differentiate between types of plastics. It also provides a uniform coding system for manufacturers. The symbol is a triangle of chasing arrows with a number from 1 to 7 inside it. This number is a resin identification code and indicates the type of plastic used in the container.
While some plastics are easier to recycle than others, every single category of plastic could potentially leach hazardous materials under extreme conditions, such as extreme heat. For example, polyvinyl chloride (PVC), which is number 3, is rarely accepted by recycling programs due to health and environmental concerns. On the other hand, Polyethylene Terephthalate (PET), High-Density Polyethylene (HDPE), and Polypropylene (PP) are considered safer options and are more likely to be picked up by recycling programs.
However, even these "safer" plastics come with risks. PET, for instance, contains antimony trioxide, a carcinogen. Meanwhile, HDPE can leach estrogen-mimicking additive chemicals that could disrupt the human hormonal system when exposed to ultraviolet light. This highlights the importance of reducing plastic use and opting for reusable alternatives or materials like metal and glass whenever possible.
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Frequently asked questions
Group 7 plastic is the category for all other types of plastic that cannot be identified as one of the six types of plastic. The best-known plastics in this group are polycarbonates (PC), which are used to make products that need to be strong and tough, such as eye protection, lenses for sunglasses, sports and safety goggles, mobile phones and compact discs.
Group 7 plastics are controversial because they can leach hazardous materials when exposed to extreme heat. They are also seldom recycled and are placed in regular waste streams.
Polyethylene Terephthalate (1-PET), High-Density Polyethylene (2-HDPE) and Polypropylene (5-PP) are considered safer options.
Look for the recycling symbol, which is a triangle of chasing arrows with a number from 1 to 7 inside it. This symbol provides important data about the used resin and recyclability of the item.
