What does the number on the recycling symbol of a plastic container indicate?

The number on the recycling symbol of a plastic container indicates the resin type, which refers to the specific kind of plastic material that the container is made from. This number helps consumers, recyclers, and manufacturers identify the type of plastic so they can properly sort and recycle it. Each number corresponds to a different resin, such as polyethylene terephthalate (PET) for the number one, or high-density polyethylene (HDPE) for the number two, among others. Understanding the resin type is crucial for effective recycling processes and determining the potential for reuse or recycling of the material. This standardized system aids in improving recycling rates and ensuring that the correct processes are used for different types of plastics.