Alexei Volkov
Plastic is everywhere, and it's not all the same. There are hundreds of types of plastic, or polymers, but only a handful are commonly used. In 1988, the Society of the Plastics Industry introduced the Resin Identification Code (RIC) system, which divided plastic resins into seven categories to help with recycling. These seven types of plastic are differentiated by recycling numbers and resin type, with some being safer and more recyclable than others.
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What You'll Learn
- Plastic resins are divided into seven categories, with different grades and uses
- LDPE is one of the oldest grades, but not environmentally friendly
- Polypropylene (PP) is the second-most produced plastic, used in packaging
- PET is the fourth-most produced, used in food and drink packaging
- Polycarbonate (PC) is a strong plastic used in sunglasses and CDs
Plastic resins are divided into seven categories, with different grades and uses
Plastic resins are divided into seven categories, each with different grades and uses. The seven types of plastic are classified according to their recycling codes.
The first type, PET, is the most common and widely used plastic. PET or polyethylene terephthalate is lightweight, strong, and typically transparent, making it ideal for food and drink packaging, beverage bottles, and fabrics. It is easily recyclable and has a positive track record, with PET bottles being the most widely recycled plastic globally.
The second type, HDPE or high-density polyethylene, is a resistant resin used for various products such as grocery bags, milk jugs, recycling bins, agricultural pipes, playground equipment, lids, shampoo bottles, and natural bottles. It is made with long unbranched polymer chains, making it stronger and thicker than PET.
The third type, PVC, is a flexible plastic that can be blended with other materials. It is commonly used in construction materials, doors, windows, bottles, plumbing products, electrical cable insulation, clothing, and medical tubing. However, PVC is challenging to recycle and is considered the most dangerous to human health due to the release of toxins throughout its lifecycle.
The fourth type, LDPE or low-density polyethylene, is one of the oldest grades of polyethylene. It is thin, flexible, and cheap to produce, commonly used in plastic bags, six-pack rings, containers, dispensing bottles, and plastic wraps.
The fifth type, PP or polypropylene, is the second-most widely produced plastic. It is lightweight, heat-resistant, sturdy, and flexible, used in packaging, laboratory equipment, automotive parts, medical devices, and food containers like Tupperware and yogurt containers.
The remaining two categories are catch-all groups for plastics that do not fall into the first five types. Group six includes plastics like acrylic, a transparent thermoplastic used as a lightweight, shatter-resistant alternative to glass in optical devices, mirrors, and plexiglass. Group seven includes polycarbonates (PC), used to create strong and tough products like lenses for sunglasses, sport and safety goggles, mobile phones, and compact discs.
While these seven categories provide a broad overview of plastic types, it is important to note that there are hundreds of plastic variations, each with unique properties and uses.
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LDPE is one of the oldest grades, but not environmentally friendly
Plastic is everywhere in the modern world. However, not all plastics are equal, and some are better for the environment than others. LDPE (low-density polyethylene) is one of the oldest grades of plastic, first produced in 1933. It is a lightweight, soft, and flexible plastic with many uses, from plastic bags to prosthetics. However, LDPE is not environmentally friendly.
LDPE is one of seven types of plastic, each with different properties and recyclability. LDPE is designated with the number 4 recycling symbol. LDPE is believed to be safe for use, but it is not widely recycled. Only a small percentage of LDPE is recycled, and only a few recycling plants accept it. This is partly due to its low density, which makes it more likely to break down and increase in surface area over time. As the surface area increases, so does the production of trace gases. LDPE emits greenhouse gases at a higher rate than other plastics, including methane, ethylene, ethane, and propylene.
LDPE is also not suitable for applications requiring stiffness, high-temperature resistance, or structural strength. When exposed to consistent sunlight, LDPE produces significant amounts of the greenhouse gases methane and ethylene. It is, however, tough, durable, and easy to form, with good chemical and impact resistance. LDPE is also FDA-compliant and food-safe.
Despite these advantages, LDPE's recyclability is limited. While recycled LDPE can be used to create new products, such as piping, sheeting, and trash bags, it is important to note that LDPE is not as commonly recycled as other plastics, such as polyethylene terephthalate (PET) or high-density polyethylene (HDPE). The limited recyclability of LDPE contributes to its negative environmental impact.
In conclusion, while LDPE has its advantages as a soft and flexible plastic, it is one of the oldest grades and is not environmentally friendly due to its limited recyclability and the production of greenhouse gases. To reduce the environmental impact of plastic, it is important to choose safer types of plastic and reduce plastic consumption whenever possible.
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Polypropylene (PP) is the second-most produced plastic, used in packaging
Plastic is available in various grades and types, with some being more recyclable than others. Polypropylene, or PP, is the second-most produced plastic globally, after polyethylene. It is a versatile plastic with many applications, particularly in the packaging industry. PP is lightweight, durable, and strong, with high resistance to chemicals and temperatures. These properties make it ideal for use in packaging applications across various industries, including food, beverage, cosmetic, household cleaning, and healthcare.
Polypropylene is commonly used in food packaging, as it is safe for food contact and is microwave and dishwasher safe. It is also used in the production of medical devices, automotive parts, and stationery folders. PP can be produced in sheet form, which is widely used for packaging, storage boxes, and stationery folders. Its wide colour range, durability, low cost, and resistance to dirt make it ideal as a protective cover for papers and other materials.
The versatility of PP extends to its ability to be produced in various colours and formats, such as thermoformed cups or trays, injection-moulded containers, blow-moulded bottles, and form-fill-seal packages. This adaptability has led to its widespread use, which has, in turn, presented challenges in recovery and recycling. PP does not have a distinguishable standard format, making it difficult to properly collect and sort when compared to other commonly recycled materials.
Despite these challenges, PP is a recyclable material. It can be melted down and reformed into new products, making it an environmentally friendly choice. The demand for recycled PP, or rPP, is growing, particularly with brand commitments for recycled content on the horizon. However, creating a clean stream of food-grade rPP has proven difficult due to the various grades, colours, and formats of PP. Extensive source control and decontamination are necessary to ensure the feedstocks are safe for food contact.
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PET is the fourth-most produced, used in food and drink packaging
Plastic is available in various shapes, colours, and grades, and it has become a predominant material in mass production since the 1950s. There are seven different types of plastic, each with distinct properties and uses. LDPE, PE, Polyester, HDPE, PVC, PP, PS, and PC are some well-known examples.
One of the most common uses of plastic is in containers or packaging, particularly for food and beverages. PET (polyethylene terephthalate) is the fourth-most produced type of plastic and is widely used in food and drink packaging. PET plastic has gained a significant market share in the past decade, increasingly replacing glass bottles, cans, and beverage cartons. It is estimated that the market for PET packaging will grow by almost 4% annually.
PET plastic is a popular choice for food and beverage packaging due to its durability, lightweight, and transparency. It is resistant to impact, moisture, and chemical reactions, making it ideal for protecting the contents from spoilage. Additionally, PET plastic is versatile and can be easily moulded into various shapes and sizes, accommodating different types of food and beverages. It is also shatterproof and customisable, meeting the specific needs of manufacturers.
PET plastic is considered safe for use in food and beverage packaging as it is non-toxic and does not contain harmful chemicals that can leach into the products. It is approved by the FDA (Food and Drug Administration) and is widely recycled, making it an environmentally friendly option. However, there are concerns about the environmental impact of PET plastic, and some studies have found the presence of nanoplastics and hormone-like substances in recycled PET bottles. As a result, the European Union is working to set standards for the safe recycling of plastic and promote the use of universal refillable bottles.
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Polycarbonate (PC) is a strong plastic used in sunglasses and CDs
Plastic is everywhere in the modern world, from food packaging to electronics and children's toys. With so much plastic around, it's important to understand the different types and grades of plastic and their impact on the environment.
There are seven main types of plastic, each with unique properties and applications. These include LDPE, PE, Polyester, HDPE, PVC, PP, and PC. Polycarbonate (PC) is a strong plastic that falls into the latter category. It is known for its strength and durability and is used in a variety of products, including sunglasses and CDs.
Polycarbonate lenses are widely used in the eyewear industry, particularly for sports goggles, safety glasses, and children's glasses. They are lightweight, thin, and highly impact-resistant, making them ideal for individuals with active lifestyles. In fact, polycarbonate lenses were originally designed for space gear to withstand low air pressure during the Apollo Space Shuttle expedition. Due to their strength, they are also used in construction, medical devices, automotive components, and protective gear.
While polycarbonate has many advantages, there are some concerns about its environmental impact. Polycarbonate is a type of thermoplastic, which means it can be easily moulded and recycled. However, it has been controversial due to the release of bisphenol A (BPA) when heated to high temperatures. BPA is a potential environmental hazard, and its decomposition in landfills contributes to aquatic pollution. As a result, it is important to consider the potential benefits and drawbacks of using polycarbonate and other plastics to make informed choices that balance functionality and sustainability.
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