Maya Ellison
Plastic is everywhere. It's in our homes, our food, our clothes, and our oceans. Humans produce more than 141 million tons of plastic packaging every year, and it's estimated that 50% to 80% of debris in marine areas is plastic. With such a significant impact on our daily lives and the environment, it's essential to understand the different types of plastics and their unique properties, uses, and environmental implications. While the term plastic is often used as a catch-all, there are actually seven main types of plastic, each with its own distinct characteristics, applications, and recyclability. From the ubiquitous PET plastic found in packaging and bottles to the versatile polystyrene used in everything from food containers to electronics, each type of plastic has a specific role to play. Understanding these differences is key to making informed decisions about plastic use and disposal, and ultimately, to reducing our environmental footprint.
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What You'll Learn
- PET plastics: used for packaging, beverage bottles, food containers, microwavable containers, and medicine jars
- HDPE plastics: used for milk, motor oil, shampoo, conditioner, and other toiletries containers
- PVC plastics: used for plumbing pipes and tiles, toys, detergents, and cooking oil bottles
- Polypropylene plastics: used for storing hot food, yogurt containers, prescription bottles, and microwaveable meals
- Polystyrene plastics: used for food packaging, takeaway containers, and laboratory ware
PET plastics: used for packaging, beverage bottles, food containers, microwavable containers, and medicine jars
There are numerous different types of plastics, each with unique properties, uses, and environmental implications. Polyethylene terephthalate (PET) is a type of plastic that is clear, durable, lightweight, and versatile. It is used for various applications, including packaging, beverage bottles, food containers, microwavable containers, and medicine jars.
PET is widely used for packaging purposes due to its excellent clarity, strength, and barrier properties. It helps preserve food freshness, resist impact, and protect against moisture and gas. PET is also commonly used for beverage bottles, as it is clear, sturdy, and lightweight, making it ideal for soft drinks, juices, and carbonated drinks. PET bottles are 100% recyclable and can be recycled into new bottles or other products such as winter jackets, rugs, and playground equipment.
PET is also used for food containers, including salad containers and various other food storage solutions. While PET containers are popular for storing and reheating food, there is a debate about their safety in microwaves. When exposed to microwave heat, PET can soften, warp, and melt, releasing harmful substances into the food. Therefore, it is essential to follow the manufacturer's instructions and use microwave-safe PET containers if available.
In the pharmaceutical industry, PET is used for medicine jars and bottles to store tablets, capsules, and syrups. These containers are flexible, durable, and lightweight, making them convenient for daily medication schedules. They also provide reliable protection, keeping the medicines fresh and safe for consumption. PET medicine bottles are designed to meet the required standards and regulations for pharmaceutical-grade containers.
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HDPE plastics: used for milk, motor oil, shampoo, conditioner, and other toiletries containers
There are seven main types of plastic, each with unique properties, uses, and environmental implications. High-density polyethylene (HDPE) is one of the most versatile and commonly used types of plastic. It is a Type 2 plastic, made from petroleum, and is known for its large strength-to-density ratio. This means it can withstand greater loads without breaking or cracking, making it ideal for containers that need to hold heavier liquids such as milk, shampoo, conditioner, and motor oil.
HDPE is also used in food packaging, pharmaceuticals, cosmetics, paints, adhesives, and other industries. It is often chosen for these applications because of its excellent chemical resistance, durability, and ability to withstand extreme temperatures. It is also non-toxic and BPA-free, making it safe for use in food containers and medical devices.
In addition to its use in containers and packaging, HDPE is used in pipe systems and outdoor applications due to its UV resistance. It is also used in toys, food storage containers, marine products, and signage. When recycled, HDPE is available in both profile lumber and sheet form, making it suitable for outdoor products such as decking, furniture, and recycling receptacles.
HDPE is considered environmentally friendly because it is recyclable and is made from post-consumer products. However, it is important to note that HDPE containers can only be reused for food and beverages if they were initially used for the same purpose, as using them for other purposes may disrupt the human hormonal system.
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PVC plastics: used for plumbing pipes and tiles, toys, detergents, and cooking oil bottles
While there are hundreds of types of plastic polymers, only a handful are commonly used. In 1988, the Society of the Plastics Industry introduced the Resin Identification Code (RIC) system, categorizing plastic resins into seven groups.
One of these groups is polyvinyl chloride (PVC), a tough plastic with a wide range of applications. PVC is used for plumbing pipes and tiles, as well as toys, detergents, and cooking oil bottles. It is also commonly used for main water lines, but not for hot water applications, as it warps at temperatures above 140°F. PVC is known for its strong resistance to chemicals, sunlight, and oxidation from water. It is often used as a substitute for painted wood in window frames and sills, as it does not decompose and is weather-resistant.
PVC can be modified by chlorination, creating chlorinated polyvinyl chloride (CPVC), which is more resistant to high temperatures and pressures. CPVC is commonly used in industrial plumbing and residential hot water lines.
PVC is also used in the medical field for flexible containers and tubing, such as blood bags and catheters. However, due to health concerns, some organizations have moved away from using PVC in medical equipment.
Despite its versatility, PVC is challenging to recycle and has been described as the most toxic plastic by Healthy Child Healthy World. The chemical used to make PVC, vinyl chloride, has been classified as a known carcinogen by the World Health Organization's International Agency for Research on Cancer.
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Polypropylene plastics: used for storing hot food, yogurt containers, prescription bottles, and microwaveable meals
Plastic is an integral part of our daily lives, with numerous types of plastics offering a range of unique properties, uses, and environmental implications. Polypropylene (PP) plastics are one such type, commonly used for storing hot food, yogurt containers, prescription bottles, and microwaveable meals.
Polypropylene plastics have a melting point of 266°F (130°C), making them suitable for storing hot food items. They are also microwavable, as demonstrated by their use in microwave-safe containers for cooking and storing food. PP containers are often used in the restaurant industry due to their durability and ability to withstand high temperatures. However, it is important to note that some sources advise against using plastic containers for oily or hot foods due to the presence of chemicals like PFAS and BPA.
Polypropylene is also used in the healthcare industry for prescription bottles. These containers are typically made of recyclable plastic, but their small size and composition make them difficult to recycle through traditional curbside recycling programs. Local pharmacies and pill bottle donation programs often offer recycling or reuse options for empty prescription bottles, helping to reduce their environmental impact.
When it comes to yogurt containers, polypropylene is a common choice due to its ability to maintain the integrity of the product. PP containers can prevent yogurt from absorbing flavours or odours from other foods stored nearby. Additionally, PP containers are lightweight, making them convenient for transportation and storage.
While polypropylene plastics offer versatility and convenience, it is important to consider their environmental impact. Plastic recycling rates are generally low, and improper disposal can lead to the leakage of harmful chemicals into the environment. Polypropylene, like other plastics, can take a long time to degrade, contributing to plastic pollution and its detrimental effects on the natural world. Therefore, it is crucial to dispose of polypropylene plastics properly and explore alternatives like glass or biodegradable options whenever possible.
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Polystyrene plastics: used for food packaging, takeaway containers, and laboratory ware
Plastic is a complex material with a variety of different types, shapes, colours, and uses. There are hundreds of types of plastic (polymers), but only a handful are commonly used. The Society of the Plastics Industry introduced a system in 1988 that divided plastic resins into seven categories, each with its own recycling code. These seven types are PET, HDPE, LDPE, Polypropylene, Polycarbonate, Polystyrene, and PVC.
Polystyrene plastics, with a resin code of 6, are commonly used for food packaging, takeaway containers, and laboratory ware. Polystyrene is made from petrochemicals and comes in two forms: rigid and foam. The rigid form is used for clear food containers, plates, bowls, cups, lids, utensils, and straws. The foam form, sometimes known by its trade name Styrofoam, is used for plates, insulated cups and bowls, clamshell containers, and trays. Polystyrene has good insulation properties, making it a popular choice for fast-food packaging requiring temperature control.
Polystyrene is based on styrene, a neurotoxin and probable carcinogen. Styrene leaching increases with temperature and with certain foods (alcohol, oils, or fats). Other health risks include synthetic chemical additives such as colourants. Due to its negative environmental impact, polystyrene has been banned in many places, and businesses are encouraged to use eco-friendly alternatives.
The use of plastic for food packaging and containers has been widespread for decades. However, the Plastic Packaging Tax (PPT) has incentivised the use of more recycled plastic, and businesses are exploring eco-friendly alternatives such as paper, wood, bioplastic, and avocado seed cutlery and tableware. While plastic containers can be safe for food, there are concerns about the thousands of compounds found in plastic products, many of which are unidentified or lack hazard data.
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Frequently asked questions
There are 7 types of plastic that vary in their chemical composition, purpose, recyclability, and hazardous nature.
The 7 types of plastic are: Polyethylene terephthalate (PET), high-density polyethylene (HDPE), polyvinyl chloride (PVC), low-density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), and 'other'.
PET is the most common type of plastic, making up almost 50% of all plastics produced. It is widely used for packaging and bottling due to its clarity, strength, and lightweight nature.
Items made from PET plastic include beverage bottles, food containers, microwavable containers, medicine jars, household cleaning products, and polyester fibers in clothes and other textiles.
No, not all types of plastic are recyclable. While some types of plastic such as PET, HDPE, LDPE, and PP are recyclable, others like polypropylene and polystyrene are not.
