Have you ever wondered why some plastics are used for certain products, or why some have different textures, characteristics, or physical, chemical, and mechanical properties, are more rigid, or even smell different than others? At Riduco, we'll tell you what they're used for and the differences between them.
What is meant by plastic and why are there so many varieties?
First, we must begin by defining what a polymer is. These are produced by the union of hundreds of thousands of small molecules called monomers, which form enormous chains of the most diverse shapes. Some resemble noodles, others have branches. Still others resemble ladders, and still others are like three-dimensional networks.
These materials are classified as natural, such as cotton, rubber, wood, wool, and cement, and synthetic, such as propylene, ethylene, and styrene.
Plastics are synthetic materials obtained from petroleum-derived compounds. Their adaptability is attributable to the wide range of polymers they comprise, each with unique properties. This variety means that plastics are found in virtually every aspect of our lives, from food bags to electronic devices.
How are synthetic polymers classified?
Synthetic polymers are generally classified into two categories, thermoplastics and thermosetting resins.
Thermoplastics are long-chain polymers that soften when heated and can be molded under pressure. They solidify by cooling in air or by contact with the mold walls. They do not undergo chemical modification, so they can be remelted and processed after being in a solid state. Thermosetting resins, on the other hand, are materials characterized by cross-linked polymer chains, forming a resin with a three-dimensional structure that initially melts under the action of heat but undergoes an irreversible chemical change, becoming infusible and impossible to process.
The most relevant types of plastic and their uses
- Polypropylene (PP): Heat and chemical resistant, polypropylene is used in food packaging, textiles, automotive parts and medical equipment, furniture, household items, among others.
- High Density Polyethylene (HDPE): HDPE, known for its durability and strength, is used in the production of detergent bottles, toys, and pipes and boxes.
- Low Density Polyethylene (LDPE): This type of plastic is flexible and is used in plastic bags, food wrappers, and plastic films.
- Polystyrene (PS): Polystyrene is a lightweight, rigid plastic used in the manufacture of disposable cups, food trays, thermal insulation, and household appliances.
- Polyethylene Terephthalate (PET): This is one of the most common plastics. We find it in water bottles, soft drinks, and other products, as well as in certain fabrics. It's lightweight and durable.
Why is it important to know the types of plastic?
- Recycling: Determining and understanding what type of plastic we are using simplifies its categorization and recycling, favoring environmental preservation.
- Food safety: Knowing which plastics are suitable for food contact ensures safe handling.
- Responsible consumption: By understanding the properties of each type of plastic, we can make more conscious purchasing decisions and reduce our environmental impact. Knowing this, we can now be responsible for their proper disposal.
What is reclaimed material?
Proper separation of plastic waste and components is key to ensuring their transformation into high-quality recycled materials, allowing for extended use and promoting a more responsible production model by reintegrating them as raw materials into new production processes. In this way, we underscore our commitment to the environment, adapting to the needs of today's market, and reducing our dependence on virgin resources.