Omar Khalid
Plastic is everywhere, and it comes in many different forms. Technically, there are thousands of different types of plastic, but they are often grouped into seven categories. Each type of plastic has its own unique properties, uses, and environmental implications. Some are easy to recycle, while others are not. Some are toxic, while others are not. Some are biodegradable, while others can persist in the environment for hundreds to thousands of years. The more we understand the various types of plastic, the better we can recycle them and protect the environment.
| Characteristics | Values |
|---|---|
| Number of types | 6, 7 or thousands, depending on how they are grouped |
| Common types | PET, HDPE, PVC, Polypropylene, Polystyrene, Polyethylene, Polyvinyl Chloride |
| Recyclability | Varies between types. PET is 100% recyclable, PVC is harder to recycle |
| Additives | Stabilizers, plasticizers, dyes, Bisphenol A (BPA) |
| Degradation | Thermodegradable, biodegradable, photodegradable |
| Manufacturing | Molding, extruding, pressing |
| Properties | Lightweight, durable, flexible, nontoxic, inexpensive |
| Sources | Natural gas, petroleum, renewable materials |
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What You'll Learn
- Plastic categories: There are seven types of plastic, categorised by their chemical composition, purpose, recyclability, and hazardous nature
- PET plastics: PET plastics are used for packaging, beverage bottles, and food containers
- Polypropylene plastics: These plastics are used for storing hot food and have qualities like heat resistance and durability
- Polystyrene plastics: Polystyrene is a versatile plastic used for food packaging, laboratory ware, appliances, toys, and more
- HDPE plastics: HDPE plastics are commonly used for milk, shampoo, and other toiletries. They are stronger and more stable than Type 1 plastics
Plastic categories: There are seven types of plastic, categorised by their chemical composition, purpose, recyclability, and hazardous nature
Plastic is a term used to describe the myriad shapes and forms that this material comes in. In reality, there are seven types of plastic, categorised by their chemical composition, purpose, recyclability, and hazardous nature.
Polyethylene Terephthalate (PET): PET plastics are the most common type of plastic, used in packaging for sodas, water, medicine jars, and household cleaning products. They are widely used because they prevent oxygen from entering the container and spoiling the perishable product inside. PET is also used for food containers, microwavable containers, and polyester fibres. It is 100% recyclable, but if not recycled, it is not easily biodegradable and can take hundreds of years to decompose.
High-Density Polyethylene (HDPE): HDPE is made from petroleum and is a versatile plastic with high strength and resistance to chemicals. It is usually opaque and is used in containers for milk, motor oil, shampoo, conditioner, and other toiletries. HDPE can be recycled, but only for food and beverages if they were initially used for the same purpose, as they may disrupt the human hormonal system otherwise.
Polyvinyl Chloride (PVC): PVC is one of the oldest synthetic plastics still in use today and is the third most-used synthetic plastic globally. It is commonly used in construction and industrial production, including window and door frames, pipes, and carpet backing. PVC is tough and durable, but it is difficult to recycle due to the release of harmful toxins. Less than 1% of PVC materials are repurposed each year, and it has been described as the most toxic plastic.
Low-Density Polyethylene (LDPE): LDPE is a flexible plastic commonly used in plastic bags and film. It is also used in plastic tubing and some parts for car interiors. LDPE is not as chemically resistant as HDPE and has a lower melting point.
Polypropylene (PP): Polypropylene plastics have a high melting point and are used for storing hot food and microwaveable meals. They are also used in yoghurt containers, syrup bottles, and prescription bottles due to their durability and heat resistance. However, this type of plastic cannot be recycled.
Polystyrene (PS): Polystyrene is a naturally transparent thermoplastic that can be a solid plastic or a rigid foam material. It is a versatile plastic used in food packaging, takeaway containers, and laboratory ware. When combined with other materials, polystyrene is used to make appliances, electronics, automobile parts, toys, and gardening pots. Expanded polystyrene (EPS), commonly known as Styrofoam, is particularly difficult to recycle and is non-biodegradable.
While these are the seven main categories, there are technically thousands of different types of plastic, with many falling into the Unallocated References category. These include polycarbonate, acrylic, fibreglass, nylon, and polylactide, which are harder to recycle due to the wide range of different materials they may include.
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PET plastics: PET plastics are used for packaging, beverage bottles, and food containers
PET plastics, or polyethylene terephthalate, are commonly used for packaging, beverage bottles, and food containers. They are widely used because they are lightweight, durable, shatterproof, and easy to recycle. PET plastics are clear and create a strong barrier that prevents oxygen from entering the container and spoiling the perishable product inside. This makes them ideal for packaging consumable goods and gives them an edge over glass containers in terms of safety and cost-effectiveness during transportation.
PET plastics are also resistant to chemicals and customisable, helping manufacturers meet specific needs. They are approved by the FDA (Food and Drug Administration) and other regulatory agencies for use in food and beverage packaging. This is because PET plastics are non-toxic and do not contain harmful chemicals that can leach into food or beverages.
PET plastics are one of the most commonly recycled plastics. They can be melted down and made into new products such as clothing, carpets, and new PET bottles. This makes them a more environmentally friendly option for food and beverage packaging.
PET plastics are also flexible and can be moulded into different shapes at a lower cost than glass. This makes it easier for brands to have distinctive packaging designs that help their products stand out on store shelves.
Overall, PET plastics are a popular choice for packaging, beverage bottles, and food containers due to their durability, lightweight, transparency, and recyclability. They are safe, attractive, and cost-effective for manufacturers and consumers alike.
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Polypropylene plastics: These plastics are used for storing hot food and have qualities like heat resistance and durability
While there are thousands of different types of plastic, they are often grouped into seven categories based on their chemical composition, purpose, recyclability, and hazardous nature. Polypropylene plastics, also known as PP, are one of the most common types of plastic used for storing hot food. They have a high melting point, typically around 266 °F, making them suitable for microwavable meals and storing hot beverages and foods.
Polypropylene plastics are valued for their durability and heat resistance. They are commonly used in food packaging, such as yogurt containers, syrup bottles, and medication bottles. Additionally, they find applications in bale wrap, pallet sheets, and reinforcements due to their chemical resistance and durability. Despite their convenience, polypropylene plastics cannot be recycled, which poses environmental challenges.
Polypropylene is FDA-approved for food contact and is considered a safer alternative to other plastics. It does not leach toxins when exposed to heat, ensuring food safety. However, it can leach plastic additives, which may lead to health concerns such as occupational asthma. Studies have shown that PP is not carcinogenic, and it is generally recognised as a safer option compared to other plastics that may contain harmful chemicals.
When choosing containers for hot food, it is essential to select those specifically designed for that purpose, such as PP containers. Other types of plastic may not have the same heat resistance and could potentially leach unknown chemicals into the food. Additionally, it is recommended to avoid storing fatty or oily foods in plastic containers, as these substances can attract some plastic chemicals and increase the likelihood of chemical migration into the food.
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Polystyrene plastics: Polystyrene is a versatile plastic used for food packaging, laboratory ware, appliances, toys, and more
While there are technically thousands of different types of plastic, they are often grouped into seven categories based on their chemical composition, purpose, recyclability, and hazardous nature. Polystyrene (PS) is one such versatile plastic that is used in a wide range of applications. It is a naturally transparent thermoplastic that is available as a typical solid plastic and as a rigid foam material.
Polystyrene is widely used in food packaging applications such as egg cartons, meat packaging, plastic cups, and vegetable containers. Its transparency and ease of sterilisation make it ideal for laboratory equipment like Petri dishes, test tubes, and medical devices. Polystyrene is also used in appliances such as refrigerators, air conditioners, ovens, microwaves, and vacuum cleaners.
Polystyrene's versatility extends to its use in electronics, automobile parts, toys, and gardening equipment. Its ability to be combined with various colourants, additives, or other plastics enhances its adaptability. For instance, polystyrene is used in the housing and parts of televisions, computers, and IT equipment, where form, function, and aesthetics are essential.
In addition, polystyrene's exceptional insulating capabilities make it suitable for construction and industrial applications. It is used in building walls, roofing, refrigerators, freezers, and cold storage facilities. Polystyrene's foam form, known as expanded polystyrene (EPS) or extruded polystyrene (XPS), is valued for its insulating and cushioning properties, making it useful for packing materials and protective packaging for fragile items.
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HDPE plastics: HDPE plastics are commonly used for milk, shampoo, and other toiletries. They are stronger and more stable than Type 1 plastics
Plastic is an umbrella term for the myriad forms and shapes that this material takes. There are technically thousands of different types of plastic, but they are grouped into seven plastic categories to make identification easier. Each of the seven types of plastic has its own number and abbreviation.
High-Density Polyethylene (HDPE) is one of these seven types. It is commonly used for milk, shampoo, and other toiletries. It is also used in grocery bags, agricultural pipes, playground equipment, lids, and recycling bins. HDPE is stronger and more stable than Type 1 plastics. It is also easily recyclable and is accepted at most recycling centres worldwide.
HDPE is an engineering-grade material that is widely used in manufacturing. It is made by mixing two chemicals: polyethylene (PE) and ethylene glycol (EG). The resulting molecule has properties similar to PE but is stronger. It is also resistant to chemicals, UV radiation, and mould. Its unique properties come from its molecular structure, which allows it to withstand heavier loads.
HDPE is used in the food industry and is considered safe for food and drink use. However, some studies have shown that it can leach estrogen-mimicking additive chemicals that could disrupt the human hormonal system when exposed to ultraviolet light. It is important to note that HDPE can only be reused for food and beverages if it was initially used for the same purpose.
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