Maya Ellison
Plastic recycling is a complex process, and not all plastics are created equal when it comes to their recyclability. The numbers and symbols on plastic items indicate the type of plastic and its potential for recycling. While most plastic is technically recyclable, the reality is that many recycling plants lack the equipment and capacity to handle all types of plastic. To ensure responsible recycling, it is essential to understand the different types of plastic and their respective recycling procedures.
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What You'll Learn
- Types 1 and 2 plastics are widely accepted by most recycling centres
- Number 3 plastics are made with polyvinyl resin (PVC) and are not as easily recycled
- Number 4 plastics are of low-density polyethylene and are usually soft and flexible
- Number 5 plastics are made of polypropylene and are a flexible hard plastic
- Number 6 plastics are made with polystyrene (Styrofoam) and are difficult to recycle
Types 1 and 2 plastics are widely accepted by most recycling centres
Plastic items are often stamped with a resin code, which is a number between one and seven inside a small triangle made of arrows. This number is important, as it corresponds to a different type of plastic, indicating the type of plastic used in the product and its recyclability.
Type 1 plastics, also known as PET or PETE, are easy to recycle and are accepted at most recycling plants. These plastics are shredded into tiny pallets and reprocessed into new bottles, and can also be turned into polyester fibre for use in fabrics. Type 2 plastics, also known as HDPE (high-density polyethylene), have a high strength-to-density ratio, resulting in superb wear resistance. They can withstand heating and freezing and can be reused without any harm, making them efficient for use in various weather conditions and the manufacture of various items.
While types 1 and 2 plastics are widely accepted, it is always good to check with your local municipality, as recycling programs can vary.
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Number 3 plastics are made with polyvinyl resin (PVC) and are not as easily recycled
Plastic products are often stamped with a resin code, which is a number between one and seven inside a small triangle made of arrows. These numbers indicate the type of plastic used in the product, with lower numbers generally indicating greater ease of recycling. Number 3 plastics are made with polyvinyl resin, commonly known as PVC or polyvinyl chloride, and are not as easily recycled as some other plastics.
PVC is one of the oldest synthetic materials, having been discovered in 1872. It is lightweight yet strong and resistant to oil and chemicals, making it a versatile material used in a wide range of products, from sewer pipes to flooring, window frames, and even household items like shower curtains and children's toys. Despite its widespread use, PVC is not as widely accepted by recycling centers as some other plastics, such as polyethylene (numbers 1 and 2).
The difficulty in recycling PVC lies in its chemical composition. The presence of chlorine, which gives PVC its desirable properties, also makes it hazardous to manufacture and dispose of. When incinerated, PVC releases carcinogenic compounds, posing potential health and environmental risks. As a result, the recycling of PVC often requires specialized processes and facilities, which may not be accessible to the general public through standard curbside recycling programs.
While some recycling programs do accept PVC products, they are often specific to certain types of PVC items. For example, the Recofloor vinyl flooring take-back scheme in the UK, Ireland, and Australia specifically focuses on recycling vinyl flooring. It is important for individuals to check with their local municipality or comprehensive waste management providers to understand the specific recycling guidelines and capabilities in their area.
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Number 4 plastics are of low-density polyethylene and are usually soft and flexible
Plastic products typically feature a recycling symbol on their surface, which looks like a triangle with arrows or numbers inside. This symbol provides information about the type of plastic used and its recyclability. Number 4 plastics, coded LDPE, are made of low-density polyethylene and are usually soft and flexible.
Number 4 plastics are commonly used in the production of shopping bags, dry cleaning bags, plastic food wrap, and squeezable bottles like ketchup or syrup containers. They are considered safe for food use and are microwave-safe. However, despite their safety, they are not environmentally friendly, as only a small percentage of LDPE plastic is recycled.
LDPE plastic can be recycled and reused to create composite lumber or floor tiles, resulting in significant greenhouse gas savings. Some recycling plants do accept LDPE plastic, but they are relatively few. To recycle number 4 plastics, individuals should contact their local solid waste authority or recycling plant to confirm if they accept this material. If accepted, it is important to ensure that the plastic is clean and free of non-plastic parts before placing it in the recycling bin.
Number 4 plastics are generally safer than plastics with other codes, such as numbers 1, 3, 6, and 7, which may contain harmful chemicals like BPA and should be avoided if possible.
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Number 5 plastics are made of polypropylene and are a flexible hard plastic
Plastic recycling numbers are symbols that indicate the type of plastic used in a product and its recyclability. Number 5 plastics, also known as PP plastics, are made of polypropylene. Polypropylene is a flexible hard plastic that is commonly used in food packaging and containers, such as yogurt containers, butter tubs, and food cups. It is also used for bottle caps, lids, syrup bottles, and Tupperware.
Polypropylene is lightweight, sturdy, and heat-resistant, making it a popular choice for various packaging applications. It is also approved by the FDA for both single and repeated-use food containers. However, it is important to note that even microwavable safe plastic can cause asthma and hormone disruption, so it is recommended to substitute plastic containers with glass whenever possible.
Number 5 plastics can be recycled, but the process may vary depending on whether they are in rigid or flexible forms. Many curbside recycling programs accept rigid plastic products, such as plastic bottles or tubs, while most do not accept flexible PP like bags or soft packaging. It is always important to check with your local municipality to understand their specific recycling guidelines for number 5 plastics.
To identify number 5 plastics, look for the number 5 or the letters "PP" inside the chasing arrows symbol on the product. By reducing the use of single-use plastics and properly recycling number 5 plastics, we can minimize their environmental impact and promote more sustainable practices.
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Number 6 plastics are made with polystyrene (Styrofoam) and are difficult to recycle
Plastic products often have symbols on them, such as little triangles with numbers, which indicate the type of plastic used in the product. These symbols are useful for consumers who want to recycle their plastic products responsibly. Number 6 plastics are made with polystyrene, also known as Styrofoam, and are used in a wide variety of consumer goods. Polystyrene is created through the polymerization of styrene, a monomer derived from oil.
Polystyrene is a versatile plastic that is commonly recognized as the white foam blocks in packaging or packing peanuts. It is also often used in takeaway food packaging. Polystyrene is lightweight, rigid, versatile, and inexpensive, which makes it extremely prevalent in our lives. It can be used to create both rigid and foam products, with the latter being known as Expanded Polystyrene (EPS).
Number 6 plastics are difficult to recycle due to their low density. They are usually not accepted in curbside recycling programs and need to be taken to specialist recyclers. However, the number of recycling centers accepting EPS is growing, and some communities have drop-off sites specifically for EPS recycling.
To recycle number 6 plastics, it is important to ensure they are clean and free of any tape, plastic film, labels, loose parts, or glued-on cardboard. The Styrofoam or polystyrene foam should be separated from other recyclables, and any colored foam should be removed as recycling facilities typically only accept white polystyrene. Breaking or cutting the foam into small pieces can help maximize the amount that fits in a box for recycling.
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