Alexei Volkov
Plastic is everywhere, and it's one of the most complicated materials to recycle. Consumers often don't know which types of plastic can be recycled and how. To help consumers and recycling plants, a Resin Identification Code (RIC) system was devised in 1988, which assigns a number from 1 to 7 to each type of plastic resin. This number is usually encased in a small triangle made of arrows. While this system helps, it's not always clear whether a plastic item can be recycled, as this depends on the capabilities of local recycling centres. Plastic #6, or polystyrene, is generally not recyclable, as it is difficult to recycle and many city recycling programs will not pick it up.
| Characteristics | Values |
|---|---|
| Plastic type | Polystyrene, a naturally transparent thermoplastic |
| Forms | Solid plastic and rigid foam |
| Expanded form | EPS (Expanded Polystyrene Styrofoam) |
| Common products | Disposable cups, takeout containers, packing peanuts, egg cartons, and Styrofoam insulation |
| Recyclability | Technically recyclable but difficult and costly; not widely accepted by recycling programs |
| Recycling process | Cannot be recycled into food containers; can be recycled into outdoor furniture, roofing tiles, and coat hangers |
| Environmental impact | Easily finds its way into the environment, where it can release toxic chemicals and be consumed by marine life |
| Health impact | Styrene, a component of polystyrene, is suspected to be carcinogenic and neurotoxic for humans |
| Identification | Number 6 inside a triangle of arrows (Resin Identification Code) |
| Local variations | Recyclability and disposal methods may vary based on local regulations and waste management infrastructure |
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What You'll Learn
- Plastic #6 is polystyrene, which is used for disposable cups, containers, and packing peanuts
- Polystyrene is a thermoplastic that comes in two forms: solid plastic and rigid foam
- Polystyrene is difficult to recycle and is not accepted by most curbside recycling programs
- When polystyrene is recycled, it can be used to make items like outdoor furniture, roofing tiles, and coat hangers?
- Recycling symbols on plastic products indicate the type of plastic resin used and how easily the product can be recycled
Plastic #6 is polystyrene, which is used for disposable cups, containers, and packing peanuts
Plastic #6 is polystyrene, a common plastic that is used for disposable cups, containers, and packing peanuts. It is also used for takeaway food packaging, CD cases, and toys. Polystyrene is identified by the #6 "PS" symbol and includes all foam products like Styrofoam and some hard plastics like disposable straws and flatware. It is lightweight, rigid, versatile, and inexpensive, which makes it popular for packaging. However, polystyrene is difficult to recycle and is not always accepted by recycling programs. It is important to dispose of polystyrene properly, as it can deteriorate into water and food sources and have harmful effects on human and environmental health.
Polystyrene is made from the monomer styrene, which is derived from oil. These monomers are polymerized to form polystyrene. It was invented in 1839 by a German apothecary named Eduard Simon, who created it accidentally while preparing medication.
While polystyrene can technically be reused and recycled, the process is challenging and costly. Most curbside recycling programs do not accept polystyrene, and it requires a specialist recycler. It is important to cut or break polystyrene into small pieces and remove any tape, plastic film, labels, or glued-on cardboard before recycling. Only clean, white polystyrene is usually accepted by recycling facilities.
To reduce the use of polystyrene, individuals can look for products packaged in PET, HDPE, or LDPE, which are easier to recycle. Using reusable food containers instead of takeaway containers is also recommended. Additionally, individuals can support companies that use biodegradable packing peanuts or alternative insulation materials, such as Woolcool, made from waste wool.
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Polystyrene is a thermoplastic that comes in two forms: solid plastic and rigid foam
Polystyrene, also known as PS, is a synthetic polymer made from the aromatic hydrocarbon styrene. It is a thermoplastic polymer that is solid (glassy) at room temperature but flows when heated above around 100°C, its glass transition temperature. It then becomes rigid again when cooled. Polystyrene is one of the most widely used plastics, with several million tonnes produced annually.
Polystyrene has two main forms: solid plastic and rigid foam. Solid polystyrene is clear, hard, and brittle, and it is often used for protective packaging, containers, lids, bottles, trays, tumblers, and disposable cutlery. It is naturally transparent but can be coloured with colourants. Solid polystyrene is also used in the making of models and as an alternative material for phonograph records.
Polystyrene foam, also known as expanded polystyrene (EPS) or Styrofoam, is a rigid and tough, closed-cell foam. It is made from pre-expanded polystyrene beads, which are created by suspending styrene monomers in water, where they undergo free-radical polymerization. The average diameter of these beads is around 200 μm. The beads are then permeated with a blowing agent, commonly pentane, which enables them to expand.
EPS has a wide range of applications due to its lightweight and insulating properties. It is often used for food containers, packaging, and shipping to cushion products. EPS is also used for non-weight-bearing architectural structures, such as ornamental pillars, and in automotive and road safety applications, such as motorcycle helmets and road barriers. While EPS is not biodegradable, it can be recycled into solid polystyrene pellets, which can then be used to create new products like coat hangers and picture frames.
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Polystyrene is difficult to recycle and is not accepted by most curbside recycling programs
Polystyrene, otherwise known as Styrofoam, is a synthetic chemical compound made from the monomer styrene. It is a lightweight, bulky, and challenging material to recycle due to several reasons. Firstly, polystyrene is often used in food packaging, making it difficult to clean due to its porous nature. Secondly, it is not biodegradable, meaning it does not degrade or break down over time, which is harmful to the environment. Polystyrene tends to be a disposable product, resulting in millions of tonnes of waste annually. As a result, chemicals from polystyrene can leach out and contaminate nearby water supplies, soil, and air.
While polystyrene can technically be recycled, the process is difficult and costly, and not all recycling centres can process it. Most curbside recycling programs do not accept polystyrene materials because they lack the necessary capabilities or find it unviable. Some centres might send polystyrene to landfills because it is cheaper than attempting to recycle it. However, this can lead to a worst-case scenario where the polystyrene pollutes the recycling stream, preventing other materials from being recycled.
To avoid this issue, it is recommended to drop off polystyrene at facilities that can properly recycle it or to reuse polystyrene packaging and avoid using it whenever possible. For example, many UPS store locations accept clean polystyrene packaging peanuts and bubble wrap for reuse. One company in Mexico City has found a way to convert polystyrene foam into pellets, which can then be used to create new products like photo frames.
Overall, while polystyrene can be recycled in certain facilities, it is not accepted by most curbside recycling programs due to the challenges and costs associated with processing it.
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When polystyrene is recycled, it can be used to make items like outdoor furniture, roofing tiles, and coat hangers
Polystyrene, otherwise known as PS plastic, is a notoriously difficult material to recycle. However, when it is recycled, polystyrene can be used to create a range of new products, including outdoor furniture, roofing tiles, and coat hangers.
One example of polystyrene being recycled to make outdoor furniture is the work of designer Sam Lander. Lander uses a chemical to dissolve polystyrene, creating a kind of goo that can be used as a material to make furniture. This material is challenging to work with, but it has some surprising properties. For instance, it can be melted down and reused if the designer is unhappy with the initial result. Additionally, the material can be tailored to suit different applications, such as being made more translucent for lighting or being turned into a structural material.
Polystyrene can also be recycled and combined with sand to create roofing tiles. This process has been explored by Seghiri M et al., who experimented with varying percentages of recycled high-density polyethylene (HDPE) mixed with sand to form a composite material for rooftop tiles. The results of this process demonstrated impressive mechanical and thermal properties, including notable flexural strength and zero percent water absorption, making the tiles ideal for insulation.
Lastly, polystyrene can be recycled and used to create coat hangers. Some stores, such as Target, accept unwanted hangers and upcycle them, reusing them multiple times before recycling them to create new coat hangers. Individuals can also donate their old hangers to thrift shops or give them away on websites like FreeCycle. It is important to note that when recycling plastic coat hangers, any metal hooks or decorative materials must be removed to prevent introducing "foreign" materials or contaminants into the batch of recyclable material.
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Recycling symbols on plastic products indicate the type of plastic resin used and how easily the product can be recycled
Plastic products are stamped with a resin code, which is a number between one and seven inside a small triangle made of arrows. This is known as the Plastic Resin Identification Code. Each number corresponds to a different type of plastic, indicating the type of plastic resin used to make the item.
The "chasing arrows" symbol, or the Mobius symbol, does not necessarily mean the product is recyclable. It is the number inside the triangle that is important, as this helps us identify the type of plastic used for the product. By understanding the number classifications, we can then determine the appropriate disposal route for our plastic products.
For example, the number 1 resin code stands for PET or PETE (polyethylene terephthalate), which is the most common plastic for single-use bottled beverages. It is lightweight and easy to recycle, although recycling rates remain relatively low. Number 2 is HDPE (high-density polyethylene), which is used for items like milk jugs, shampoo bottles, and detergent bottles. This is widely recycled and often accepted by stores. Number 3 is PVC (polyvinyl chloride), which is not easily recyclable. Number 4 is LDPE (low-density polyethylene), which is used for plastic bags and wrapping and can be recycled at specialist points. Number 5 is PP (polypropylene), which is durable, strong, and lightweight, and is increasingly being accepted in curbside recycling programs. Number 6 is PS (polystyrene), which is not accepted in many curbside recycling programs, but it can be recycled to make egg cartons, takeout containers, and rulers. Finally, Number 7 stands for "other plastics," which can include acrylic, polycarbonate, or fiberglass.
It is important to note that the presence of a recycling symbol on a product does not guarantee that it can be recycled. The recyclability of a product depends on various factors, including the capabilities of local recycling facilities and the specific guidelines of local municipalities.
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Frequently asked questions
Plastic #6, also known as polystyrene, is a lightweight material that is often used to make disposable cups, takeout containers, packing peanuts, egg cartons, and Styrofoam insulation.
Technically, plastic #6 can be recycled. However, the process is difficult and costly, and most curbside recycling programs do not accept it. It is important to check with your local recycling program, as the recyclability of plastic #6 can vary depending on your location.
Polystyrene is notorious for its inability to biodegrade, and it easily finds its way into the environment, where it can release toxic chemicals and harm the ecosystem. Additionally, when polystyrene is recycled, it cannot be used for food containers again, limiting its potential for reuse.
