The number on a plastic container typically indicates the type of plastic resin used to make the container. This number is part of the Resin Identification Code (RIC), which was introduced by the Society of the Plastics Industry (SPI) in 1988 to help recycling facilities and consumers identify and sort different types of plastics for recycling purposes.

The RIC consists of a triangle-shaped symbol with a number inside it, ranging from 1 to 7, along with abbreviation letters indicating the type of plastic resin. Here’s what each number represents:

1. PET (Polyethylene Terephthalate): Commonly used for beverage bottles, food jars, and other containers for consumer goods. This plastic is recyclable and often used for products such as soda bottles and salad dressing containers.
2. HDPE (High-Density Polyethylene): Used for items such as milk jugs, detergent bottles, and shampoo bottles. HDPE is also recyclable and is known for its strength and resistance to chemicals.
3. PVC (Polyvinyl Chloride): PVC is used for pipes, vinyl flooring, and some food packaging. It’s less commonly recycled due to concerns about the release of toxic chemicals during recycling processes.
4. LDPE (Low-Density Polyethylene): LDPE is used for plastic bags, shrink wraps, and flexible packaging. It’s recyclable but less commonly accepted by recycling facilities.
5. PP (Polypropylene): PP is used for yogurt containers, bottle caps, and some food packaging. It’s recyclable and has a high melting point, making it suitable for hot-fill applications.
6. PS (Polystyrene): PS is used for foam cups, packaging peanuts, and disposable food containers. It’s recyclable but less commonly accepted by recycling facilities due to challenges in processing.
7. Other: This category includes various types of plastics that don’t fit into the previous categories. It may include polycarbonate (PC) used in items like baby bottles and CDs, as well as other less common plastics. Some plastics in this category, such as polycarbonate, may contain bisphenol-A (BPA), which has raised health concerns.

The number and symbol help consumers and recycling facilities identify the type of plastic, facilitating proper sorting and recycling practices. However, it’s important to note that not all plastics marked with a recycling number are accepted by all recycling programs, so it’s essential to check with your local recycling facility for specific guidelines on what plastics they accept.

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