Plastic containers are ubiquitous in our daily lives, from the water bottles that we use to drink to the food containers that we use in our kitchens. Yet most people neglect the small relief triangle and the number that includes them. These symbols are not mere random markings; they play an essential role in the life cycle of plastic products. Understanding these symbols can enable consumers to make more informed choices and improve their recycling practices.
Understanding the high triangle and the number
The relief triangle, often referred to as the “recycling symbol”, is a universal indicator of the recyclability of a plastic product. Inside the triangle is a number between 1 and 7, called the resin identification code (RIC). The code identifies the type of plastic used, a crucial element for the proper treatment of waste by recycling facilities.
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What each number means
1. PET or PETE (polyethylene terephthalate): these are water bottles and soda, for example. Very common, it is generally easy to recycle.
2. HDPE (high-density polyethylene): Think of milk cans, laundry bottles or plastic bags. It is resistant and widely recyclable.
3. 3. PVC (polyvinyl chloride): Used for pipes, vinyl coatings or certain packagings. It is more difficult to recycle and is not accepted everywhere.
4. LDP (low-density polyethylene): This is a flexible material such as plastic film or grocery bags. It is recyclable, but cannot always be dropped off; sometimes a deposit point is required.
5. PP (polypropylene): Yoghurt pots, bottle caps or straws. This material is durable and increasingly recyclable.
6. PS (polystyrene): Polystyrene cups, takeaway containers or plastic utensils. Lightweight, it is often difficult to recycle; many places do not accept it.
7. Other: This is the tote solution for plastics that do not fit into sizes 1 to 6, such as polycarbonate (conventional bottles) or mixed plastics. Recycling options are very varied, and they are often the least recyclable.
The history and development of plastic identification codes
The resin codes system was introduced in 1988 by the Plastics Industry Company (now known as the Plastics Industry Association). This system was developed to help recycling facilities sort and treat plastics more efficiently, as each type of plastic requires specific handling and processing techniques.
Why do plastic identification codes exist?
Plastics identification codes exist for several reasons, all of which contribute to a more sustainable and efficient use of plastics. They streamline recycling processes, inform consumers, help manufacturers, ensure compliance with regulations and improve safety standards.
Reason 1: Facilitating recycling processes
Recycling facilities rely on the resin identification code to sort plastics accurately. Each type of plastic has unique properties that determine its treatment. For example, PET (polyethylene terephthalate) is commonly recycled to make new bottles, while HDPE (high density polyethylene) is often used in the manufacture of wood.
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