Sofia Martinez
Plastic is an integral part of our daily lives, with numerous types of plastics offering various benefits. However, understanding the different types of plastics is crucial for making informed decisions about their use and disposal. While some plastics are reusable and easily recyclable, others produce hazardous waste and require sophisticated recycling processes. The two most common types of plastics are polyethylene (PE) and polypropylene (PP), which are distinguished by their unique physical properties and applications.
| Characteristics | Values |
|---|---|
| Most common plastic on earth | Polyethylene (PE) |
| Second most widely produced synthetic plastic | Polypropylene (PP) |
| LDPE use cases | Bags, plastic wraps, coatings for paper milk cartons, food storage containers, wire and cable covering |
| PP use cases | Food containers, automotive parts, textiles, sanitary pad liners, diapers, thermal vests |
| PP properties | Lightweight, durable, can withstand high temperatures, stronger than PE, flexible, heat resistant, acid resistant, cheap |
| PET use cases | Beverage bottles, food containers, microwavable containers, polyester fibers |
| PET properties | Excellent clarity, strength, barrier properties, shatterproof, high strength-to-weight ratio, easily recyclable |
| HDPE use cases | Grocery bags, milk jugs, recycling bins, agricultural pipe, playground equipment, shampoo bottles, plastic bottles, piping for water and sewer, snowboards, boats, folding chairs |
| HDPE properties | Resistant resin, stronger and thicker than PET, relatively hard, impact resistant, recyclable |
| PVC properties | Hazardous, may leach toxic chemicals such as bisphenol A (BPA), phthalates, lead, dioxins, mercury, and cadmium |
| Polycarbonates (PC) use cases | Eye protection (lenses for sunglasses, sports and safety goggles), mobile phones, compact discs |
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What You'll Learn
- Polyethylene Terephthalate (PET) is a common plastic with excellent clarity, strength, and barrier properties
- High-Density Polyethylene (HDPE) is a versatile plastic with high strength and chemical resistance
- Polyvinyl Chloride (PVC) is the third-most produced synthetic plastic polymer
- Polypropylene (PP) is a lightweight, durable, and heat-resistant plastic
- Polycarbonates (PC) are used to build strong, tough products like lenses and CDs
Polyethylene Terephthalate (PET) is a common plastic with excellent clarity, strength, and barrier properties
Polyethylene terephthalate (PET) is a condensation polymer that is commonly used in many products. It is produced by the esterification of ethylene glycol (EG) with terephthalic acid (TPA) or dimethyl terephthalate (DMT). PET is one of the most widely used plastic polymers due to its versatility, lightweight, physical clarity, and remarkable strength. It is also known for its excellent chemical resistance to organic materials and water.
The versatility of PET makes it valuable in diverse applications, especially in the packaging of food, beverages, and medicines. It is also used in the fabrication of carbonated beverage bottles due to its high strength, toughness, and good abrasion and heat resistance. PET is widely recycled and is considered safe for contact with food and beverages by various health regulatory and consumer safety agencies worldwide.
In its most stable state, PET is a colorless, semi-crystalline resin. It can be formed into either non-crystalline (amorphous) or crystalline articles, making it useful in fibre and film applications. PET has better barrier properties than aliphatic polymers and is strong and impact-resistant. It is also hygroscopic, absorbing water.
PET is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing. It is also combined with glass fibre for engineering resins. The biggest application of PET is in fibres, with bottle production accounting for about 30% of global demand.
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High-Density Polyethylene (HDPE) is a versatile plastic with high strength and chemical resistance
High-Density Polyethylene (HDPE) is a versatile plastic with a wide range of applications. It is a thermoplastic polymer made from petroleum, known for its high strength-to-density ratio, tensile strength, and large strength-to-density ratio. HDPE has greater strength and stiffness than LDPE (Low-Density Polyethylene), making it suitable for a broader range of applications.
The density of HDPE can vary between 0.93 and 0.97 g, or 930 to 970 kg/m3, which is marginally higher than LDPE. This slight difference in density gives HDPE stronger intermolecular forces and tensile strength. Its molecular structure has little branching, contributing to its strength. The molecular weight of HDPE, or the length of the polyethylene chains, influences its flexibility, yield strength, and melt temperature.
HDPE is commonly used in the production of plastic bottles, corrosion-resistant piping, geomembranes, plastic lumber, and cell liners in sanitary landfills. It is also used for chemical tanks, cutting boards, water pipe flanges, indoor and outdoor playgrounds, marine construction, and orthotics and prosthetics. One of its notable applications is in the pyrotechnics trade, where HDPE is preferred over steel or PVC tubes for mortars due to its durability and safety.
HDPE is lightweight, easy to fabricate, weld, and bond, and highly resistant to corrosion, chemicals, abrasion, and flames. It can withstand temperatures of up to 120°C and is safe for direct and indirect food contact, making it suitable for food and beverage containers, cutting boards, and milk bottles. Additionally, HDPE is weather-resistant, long-lasting, and recyclable, making it an environmentally friendly choice for many applications.
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Polyvinyl Chloride (PVC) is the third-most produced synthetic plastic polymer
PVC is a lightweight, rigid plastic in its pure form, but it is also manufactured in a flexible "plasticized" form. It is derived from salt (57%) and oil or gas (43%). It is well-known for its ability to blend with other materials. For example, expanded PVC sheets are a foamed polyvinyl chloride material that is ideal for products like kiosks, store displays, and exhibits. The rigid form of PVC is commonly found in construction materials, doors, windows, bottles, and non-food packaging.
With the addition of plasticizers such as phthalates, the softer and more flexible form of PVC is used in plumbing products, electrical cable insulation, clothing, medical tubing, and other similar products. Very fine particles of PVC can be dispersed in plasticizer in excess of the amount used to make plasticized PVC (e.g., 50% or more), and this suspension can be heated until the polymer particles dissolve. The most commonly used plasticizer is the compound di-2-ethylhexyl phthalate (DEHP), also known as dioctyl phthalate (DOP).
PVC has been linked to certain types of occupational cancers, and it produces HCl and carbon dioxide upon combustion. Studies of household waste burning indicate consistent increases in dioxin generation with increasing PVC concentrations. Despite this, PVC is still widely used in an enormous range of domestic and industrial products, from raincoats and shower curtains to window frames and indoor plumbing.
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Polypropylene (PP) is a lightweight, durable, and heat-resistant plastic
Polyethylene (PE) and Polypropylene (PP) are two of the seven most common types of plastics. This answer will focus on the latter, Polypropylene, which is a lightweight, durable, and heat-resistant plastic.
Polypropylene is a thermoplastic polymer and the world's second-most-produced synthetic plastic. Its widespread use and popularity are due to its flexibility and strength. PP plastic is stronger than PE, yet it retains its flexibility and will not crack under repeated stress. It is also acid-resistant and cheap to produce.
PP is commonly used in food containers, automotive parts, textiles, and medical devices. It is considered one of the safer plastics, with a lower environmental impact and a higher rate of recyclability. However, products made from PP that end up in landfills and are not properly recycled can take 20-30 years to decompose, during which time they release harmful toxins, including cadmium and lead.
The flexibility of PP plastic lends itself to a wide variety of uses. In addition to those mentioned above, PP is used in thermal vests, disposable diapers, and sanitary pad liners. It is also used in the production of laboratory equipment.
Overall, Polypropylene is a versatile, durable, and lightweight plastic with a wide range of applications. Its heat resistance and strength make it ideal for various industries, including automotive, medical, and food packaging. While it is considered safer and more recyclable than some other plastics, proper disposal and recycling are still important to mitigate its environmental impact.
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Polycarbonates (PC) are used to build strong, tough products like lenses and CDs
Polycarbonates (PC) are a group of thermoplastic polymers that contain carbonate groups in their chemical structure. They are strong, tough, and some grades are optically transparent. Polycarbonates are used in a variety of applications due to their ease of workability, mouldability, and thermoformability.
Polycarbonates are commonly used for eye protection, such as lenses for sunglasses, sports goggles, safety goggles, and eyeglasses. They are also used in other projectile-resistant viewing and lighting applications that would typically use glass but require higher impact resistance. Polycarbonate lenses also protect the eyes from UV light.
Polycarbonates are frequently used in compact discs (CDs) and digital video discs (DVDs). Its high transparency and impact strength make it suitable for these applications.
Polycarbonates are further used in the automotive industry for headlamp lenses, interior components, sunroofs, and windscreens for small vehicles like motorcycles, ATVs, and golf carts. Its lightweight and impact-resistant nature make it ideal for these applications.
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Frequently asked questions
The two most common plastics are polyethylene (PE) and polyvinyl chloride (PVC).
Polyethylene is used for a wide variety of products, including shopping bags, plastic bags, food containers, gas pipes, screw closures, plastic bottles, piping, snowboards, boats, and folding chairs.
PVC is the third-most widely produced synthetic plastic polymer. It can be manufactured to be rigid or flexible. Rigid PVC is used in construction materials, doors, windows, bottles, and non-food packaging. Softer, flexible PVC is used in plumbing products, electrical cable insulation, clothing, and medical tubing.
Polyethylene is considered a safer plastic for food and drink use. LDPE, a type of polyethylene, is difficult to recycle. PVC is considered the most hazardous plastic due to its potential to leach toxic chemicals such as bisphenol A (BPA), phthalates, lead, dioxins, mercury, and cadmium.
Polypropylene (PP) is another commonly used plastic. It is lightweight, durable, and can withstand high temperatures. It is used in food containers, automotive parts, textiles, and sanitary products.
