Chloe Zhang
Plastic #6, also known as polystyrene or PS, is notoriously difficult to recycle. While it is technically possible to recycle, it is rarely profitable to do so. This is because polystyrene is often contaminated by food or other substances, making it harder to reuse. Additionally, polystyrene has a higher melting temperature, which adds to the cost of the recycling process. Polystyrene is also lightweight, which means it is prone to ending up in natural ecosystems, where it poses a threat to wildlife. For these reasons, it is important to limit the use of polystyrene products and opt for more sustainable alternatives.
Why is Plastic 6 Not Recyclable?
| Characteristics | Values |
|---|---|
| Consumption rate | High and projected to increase |
| Recycling rate | Low but has increased; EUMEPS pledged a 46% recycling rate by 2025 |
| Environmental impact | Prone to landing in wild spaces and oceans, threatening wildlife and natural ecosystems |
| Human health impact | Styrene can migrate from polystyrene food containers into food or beverages, posing health problems |
| Decomposition | Does not biodegrade over time in landfills, forming a lumpy mess that can pollute groundwater |
| Contamination | Prone to contamination by food and other substances, making resins not clean enough to be reused |
| Profitability | Small quantities of plastics can make recycling unprofitable due to low efficiencies and high costs |
| Buyer's market | Lack of a strong buyer's market for sorted polystyrene from recycling facilities |
| Melting temperature | Higher melting temperature, increasing the cost of the recycling process |
| Recycling options | Curbside recycling, drop-off programs, mail-in programs |
| Sorting | Often sorted out and sent overseas, melted down into a #7 "other" plastic or burned as fuel |
| Post-consumer value | Foam items and #6 hard plastics have very little value as a post-consumer commodity |
| Health impact | Petroleum-based products like plastic are carcinogenic and can cause cellular changes when ingested by humans |
| Identification | Polystyrene can be identified by a #6 "PS" symbol and includes foam products and some hard plastics |
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What You'll Learn
- Polystyrene is hard to recycle and has a high melting temperature
- Small plastic items made from polystyrene are difficult to recycle
- Low demand for recycled polystyrene products
- Polystyrene is often lightweight and prone to ending up in oceans and wild spaces
- It is expensive to build and operate recycling facilities
Polystyrene is hard to recycle and has a high melting temperature
Polystyrene, or PS plastic, has a reputation for being hard to recycle. Its consumption rate is high and projected to increase over time, and while its recycling rates have also increased, it is still less commonly recycled than some other types of plastic. Polystyrene is lightweight and prone to ending up in wild spaces and oceans, where it poses a threat to wildlife and natural ecosystems. It also does not generally biodegrade over time in landfills, instead forming a lumpy mess that can pollute groundwater.
Polystyrene is often used for food packaging, and there are concerns that styrene from polystyrene food containers can migrate from the foam into the food or beverage, posing health problems for those consuming the product. Some cities have banned polystyrene foam from being used for food service, but this has usually resulted in an increase in other food packaging waste.
Despite its reputation for being hard to recycle, polystyrene can be recycled into a range of new products, including casings for electronics like cameras and video cassettes. Some curbside recycling programs will accept polystyrene, and some communities have drop-off programs where people can take their foam waste to be recycled. There are also companies that offer mail-in programs for polystyrene waste.
Polystyrene has a high melting temperature of around 90 degrees Celsius. This is lower than the melting point of PVC, which is close to 210 degrees Celsius, and polyamide, which is around 200 degrees Celsius. However, polystyrene's melting temperature is higher than that of high-density polyethylene (HDPE) plastic, which has a melting point of 130 degrees Celsius.
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Small plastic items made from polystyrene are difficult to recycle
Polystyrene, often labelled as #6 plastic, is a synthetic chemical compound made from styrene, a liquid hydrocarbon. When styrene is heated, its molecules link together into long chains, creating a polymer material that solidifies at room temperature. This process results in a lightweight, versatile, and useful product. However, small plastic items made from polystyrene pose several challenges when it comes to recycling.
Polystyrene is commonly used in food packaging and insulation, and its versatility means it can be found in various products, from takeout containers and beverage cups to packaging peanuts and appliances. Its lightweight and bulky nature makes it hard to collect through curbside recycling programs as it often blows away and becomes litter. This also makes it difficult and expensive to transport.
Polystyrene is often highly contaminated with food scraps, paper, and other types of plastic, such as straws and cups. This contamination, as noted by Tim Stedman, CEO of Agilyx, an advanced recycling company, requires "a significant amount of pretreatment for many recycling systems." The presence of additives and other materials further complicates the recycling process, as these must be removed before polystyrene can be reused to create new products.
While some curbside recycling programs do accept polystyrene, many municipal programs do not. Centralized plants that can handle polystyrene recycling face increased costs, reducing the incentive to recycle. Additionally, health concerns surrounding the use of recycled polystyrene in food contact applications further limit its reuse.
Despite these challenges, recycling polystyrene is possible, and some companies now offer mail-in programs for polystyrene waste. Certain types of polystyrene, such as expanded polystyrene (EPS), are recyclable, and innovations in chemical recycling technologies offer hope for increased polystyrene recycling rates.
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Low demand for recycled polystyrene products
Polystyrene, or plastic #6, is known for its durability, which makes it a popular choice for manufacturers in packaging materials and insulation. However, this durability also means it is not easy to biodegrade or recycle. Polystyrene is lightweight, and its low density makes it prone to ending up in natural ecosystems, where it causes harm to wildlife.
Polystyrene is widely used in disposable products such as drinking cups, food containers, and shipping paddings. Its consumption rate is high and projected to increase over time. Despite this, the demand for recycled polystyrene products is low. This is partly due to the high cost of polystyrene waste, which is often greater than the cost of using new, non-recycled materials. The high cost of polystyrene waste is largely due to the expense of transportation—the low density of polystyrene means a greater volume is required, which is inefficient and costly.
The market volume of upcycled polystyrene products does not match the demand for virgin polystyrene. This is a significant barrier to incorporating polystyrene waste into industrial processes. The recycling rate for polystyrene could be as low as 7% or as high as 30%, depending on the demand or collected amounts, respectively. Some companies are now offering mail-in programs to recycle polystyrene, and some cities have banned its use in food service to reduce waste.
Despite the low demand for recycled polystyrene, there are benefits to using it. Recycled polystyrene reduces the need for virgin plastic, decreases the environmental impact of manufacturing, and enhances brand loyalty among environmentally conscious customers. Recycled polystyrene can be used in a range of new products, including casings for electronics, insulation panels, and packaging materials.
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Polystyrene is often lightweight and prone to ending up in oceans and wild spaces
Polystyrene, or PS plastic, is challenging to recycle and has a reputation for being hard to recycle. It is lightweight and buoyant, which means it frequently ends up in oceans and wild spaces, posing threats to wildlife and natural ecosystems. Its lightweight nature also means it can be easily carried away by wind, rain, or birds, contributing to its presence in maritime uses such as fisheries, aquaculture, and water sports.
Polystyrene is often used in takeaway containers and cups, and its lightweight and water-resistant properties make it a popular choice for the seafood industry. It is commonly used for buoys, food packaging, fish boxes, and cool boxes. However, its low durability means it easily crumbles into smaller pieces, making it a common form of plastic pollution in oceans and other bodies of water.
The challenges of recycling polystyrene are due to its high volume-to-weight ratio. Its lightweight nature means that without being crushed, it takes up a lot of space, making transportation to recycling centers economically unviable. Additionally, once polystyrene has been contaminated with residues and fluids, mechanical recycling becomes less attractive, and chemical recycling is not yet scalable.
To address the issue of polystyrene pollution, some cities have banned its use in food service, and companies are transitioning to more sustainable materials. For example, EPE USA offers 100% curbside recyclable cushioning foam, and Mondi's FishBox reduces the amount of air shipped, minimizing fleet and lowering CO2 emissions. These efforts aim to reduce the impact of polystyrene on the environment and promote more sustainable alternatives.
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It is expensive to build and operate recycling facilities
One of the primary reasons why Plastic #6, also known as polystyrene or Styrofoam, poses challenges in the recycling process is the high cost associated with building and operating dedicated recycling facilities. Constructing and maintaining such facilities requires substantial financial resources, which can be a significant barrier.
The specialized nature of polystyrene recycling demands purpose-built infrastructure, which inevitably incurs substantial capital expenditure. Dedicated machinery and equipment tailored to process polystyrene need to be acquired and installed, contributing significantly to the overall cost. Moreover, the operational expenses of running these facilities are equally demanding. Energy consumption, for instance, becomes a critical factor, as the process of recycling polystyrene often requires additional energy input compared to other plastics. The energy-intensive nature of the recycling process adds to the overall operational costs.
Another crucial aspect is the skilled labour required to operate and manage these facilities effectively. Employing a team of trained professionals capable of handling the intricacies of polystyrene recycling can be costly. Their expertise is essential in ensuring the proper handling, processing, and maintenance of the equipment, driving up operational expenses. Furthermore, the transportation of polystyrene waste to centralized facilities can be logistically challenging and expensive, especially when dealing with large volumes or remote locations.
The economic viability of polystyrene recycling facilities is closely tied to market demand for recycled polystyrene products. Creating a robust market for recycled goods can be difficult, and without sufficient demand, the revenue from selling recycled polystyrene products may not cover the high operational costs. This economic reality may deter investment in building and operating dedicated recycling facilities, exacerbating the challenges of polystyrene waste management. Thus, the high costs of constructing and operating specialized facilities remain a significant hurdle in recycling Plastic #6, emphasizing the need for innovative solutions and policies to address this complex environmental issue.
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Frequently asked questions
Plastic 6, or polystyrene, has a reputation for being hard to recycle. It is often sorted out at Material Recovery Facilities (recycling centres) and sent overseas, where it is either further sorted, melted down into a different type of plastic, or burned as fuel.
Plastic 6 is often not recycled because there is not a strong buyer's market for it. It also has a higher melting temperature, which adds to the cost of the recycling process.
Plastic 6 is used in Styrofoam, as well as some hard plastics like disposable straws, plastic utensils, and bottle caps.
Although it is difficult to recycle plastic 6, some curbside recycling programs will accept it. There are also drop-off and mail-in programs that specifically take polystyrene for recycling.
