Chloe Zhang
Plastic is ubiquitous in the modern world, and recycling it is crucial for environmental health. However, not all plastics are created equal when it comes to their ability to be recycled. Type 5 plastic, or polypropylene, is a flexible hard plastic commonly used in packaging, including clamshell food containers, screw-on caps, and yogurt cups. Despite its prevalence, Type 5 plastic poses recycling challenges due to its unique properties. Understanding why Type 5 plastic is not always accepted for recycling involves exploring the complexities of the recycling process and the varying capabilities of recycling centers.
| Characteristics | Values |
|---|---|
| Common Uses | Bottle tops, food containers, yoghurt containers, single-use cutlery, packaging for personal care products, prescription medicine bottles, hummus tubs, laboratory and medical supplies |
| Accepted by recyclers? | Yes, but only about 3% of PP products are currently being recycled in the US. It is not accepted by most public recycling centres. |
| Recyclable through | Some curbside recycling programs, specialist recyclers, mail-in options, Preserve's Gimme 5 program, Terracycle brigade programs |
| Not Accepted By | Most curbside recycling bins |
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What You'll Learn
Polypropylene (PP) is hard to recycle
Polypropylene (PP), identified by the number 5 in the chasing arrows symbol, is the second-most widely produced plastic. It is used in everything from bottle tops, straws, disposable diapers, food containers, yogurt containers, and rope. While PP is recyclable, it is not as straightforward to recycle as other materials like aluminium cans.
Firstly, PP is not widely accepted by curbside recycling programs. This is because most residential recycling receptacles and local recycling centres are not equipped to recycle PP. Therefore, companies or individual consumers must seek out companies that handle polypropylene recycling.
Secondly, PP products are difficult to sort at Material Sorting Facilities (MRF) due to their variety of shapes, sizes, colours, and the addition of other, non-PP, materials that contaminate the PP recycling stream. For example, polypropylene bags must be collected, sorted, shredded, separated by colour, and then compounded in order to be processed effectively.
Thirdly, PP is often downcycled and sent to landfills, or used in 'waste-to-energy' plants, which is a term for incinerators that generate electricity. Products made of PP that end up in landfills can take around 20-30 years to decompose and can release hazardous fumes and chemicals.
However, recycling PP is critical when it comes to minimising waste and protecting the environment. Recycling PP reduces the amount of plastic being produced from scratch, which also reduces the environmental impact of plastic production.
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China's National Sword Policy stopped accepting plastic waste
Plastic number 5, or polypropylene (PP), is the second-most widely produced plastic. It is commonly used for bottle tops, food containers, and yoghurt containers. Many curbside recycling programs accept plastic number 5 rigid items like yoghurt containers but not soft flexible items. However, some specialist recyclers do accept soft plastics.
China's National Sword Policy, enacted in January 2018, banned the import of most plastics and other materials headed for the nation's recycling processors. This policy was a response to the rapid expansion of disposable plastics in the 1990s, which drove imports up rapidly. Yearly global imports grew by 723% from 1993 to 2016. For developed nations, it is often more economical to export plastic waste than to recycle it domestically. For over 25 years, China had been the world's largest plastic waste importer, receiving about 45% of the world's plastics set for recycling since 1992.
The National Sword Policy was also a response to the large amounts of contaminated waste and low-quality plastics that were hard to sort and recycle, accumulating in trash dumps and at recyclers. The policy banned 24 categories of solid waste and stopped importing plastic waste with a contamination level above 0.5%, down from the previously allowed 5-10%.
The ban on plastic waste imports by China, the world's biggest market for recyclable waste, has caused a "congestion of the whole system". Other Asian countries like Malaysia, Thailand, and Vietnam have increased their waste imports, but they do not have as well-developed waste management systems. Experts say that this situation offers an opportunity to develop better solutions for a growing throwaway culture.
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PP is widely used for food containers
Polypropylene (PP) is a commonly used plastic for food containers. It is the second-most widely produced plastic and is known for its versatility, durability, safety, and recyclability. PP containers are suitable for storing a variety of foods, including hot meals, cold salads, desserts, and beverages. They are also safe for freezer storage, as they maintain their structural integrity at low temperatures, preventing food from freezer burn.
One of the main advantages of PP containers is their durability. PP is resistant to physical impacts, making it ideal for sturdy and long-lasting containers. This durability also reduces the need for single-use packaging, as PP containers can be reused multiple times before disposal. Additionally, PP containers are lightweight, making them convenient for transportation and handling.
Another key feature of PP containers is their heat resistance. PP can withstand high temperatures, making it suitable for microwavable containers. This high heat resistance ensures that PP containers will not leak toxins when exposed to heat. It also makes them ideal for maintaining the temperature of food during delivery or takeout.
PP containers are also chemically resistant, which is essential for containing various types of food. They are resistant to many chemicals, including oils and solvents. This resistance helps to maintain the integrity of the container and prevent contamination of the food.
While PP is widely recyclable, it is important to note that not all recycling programs accept all forms of PP. Curbside recycling programs may accept rigid PP items like yogurt containers but not soft flexible items like chip packets or ropes. It is always recommended to check with local authorities to confirm which types of PP they accept for recycling.
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PP is safe for reuse but not recycling
Polypropylene (PP) is a thermoplastic polymer widely used for various applications. PP is identified by the number 5 in the chasing arrows symbol and is the second-most widely produced plastic. PP is considered safe for reuse but not always recyclable. PP products are tough, lightweight, and have excellent heat-resistance qualities. They serve as a barrier against moisture, grease, and chemicals.
PP is commonly used for disposable diapers, pails, plastic bottle tops, margarine and yogurt containers, potato chip bags, straws, packing tape, rope, and kitchenware. While PP is safe for reuse, it is important to understand the limitations of polypropylene recycling. PP bags, for example, must be collected, sorted, shredded, separated by color, and then compounded to be effectively recycled.
Only about 1-3% of PP is recycled, with the rest ending up in landfills where it slowly decomposes and releases hazardous fumes and chemicals. To recycle products made from PP, it is essential to check with local curbside programs to see if they accept this material. Some curbside recycling programs accept PP rigid items like yogurt containers but not soft, flexible items.
To reduce PP consumption, individuals can opt for reusable alternatives, such as reusable straws, water bottles, and cloth diapers, instead of disposable plastic ones. Additionally, replacing plastic grocery bags with fabric alternatives and plastic sandwich bags with platinum silicone alternatives can help decrease PP usage.
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PP is one of the least recycled plastics
Polypropylene (PP), also known as plastic number 5, is one of the least recycled plastics. PP is the second-most widely produced plastic, composing around 16% to 17% of annual global plastic production. It is a common plastic used to create end goods for consumers, such as plastic packaging, and is the most used plastic packaging material in the United States. It is also used for food containers, medicine bottles, spatulas, lotion bottles, and ink cartridges.
Despite the high demand for PP, its recycling rate is very low. In the United States, only about 9-11% of plastics that are thrown away are recycled, with PP foam having a recycling rate of below 1%. The low recycling rate of PP is due to several challenges that the current plastic recycling technology is not equipped to handle. PP is sensitive to high heat, causing it to lose significant chemical integrity, strength, and flexibility during the mechanical recycling process. Recycled PP often has inferior properties compared to virgin PP, such as a lower melt-flow rate, molecular weight, and thermal stability, due to contamination or degradation during recycling.
The high regulatory standards for food-safe plastic make it challenging to use recycled PP in most market applications. The price of recycled PP is also significantly higher than virgin PP due to the extensive testing and additives required for food-grade certification and the lack of economies of scale in PP recycling. These economic factors have discouraged companies from investing in large-scale dedicated recycling facilities for PP.
While PP can be recycled and should be recycled wherever possible to protect the environment, its low recycling rates make it one of the least recycled plastics. PP's inherent flexibility allows it to be recycled into various products, including clothing fibres, industrial fibres, food containers, and dishware. However, the majority of PP waste ends up in landfills, posing a severe threat to the environment due to its slow decomposition rate of 20 to 30 years.
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Frequently asked questions
Type 5 plastic, or polypropylene (PP), is accepted by some recycling centres. However, it is not widely recycled, with reports that less than 1% of PP is recycled. PP is hard, sturdy, and heat resistant, which makes it useful for holding hot materials, but it is not resistant to solvents and aromatics.
In 2018, China stopped accepting plastic waste from other countries, which has made it more difficult for countries like the US to recycle Type 5 plastic.
You can check with your local recycling program to see if they accept Type 5 plastic. There are also some mail-in options for recycling Type 5 plastic, such as TerraCycle.
