What specific type of plastic material was critical for the construction of the wheelie bin?
High-density polyethylene (HDPE)
The shift to the wheelie bin was fundamentally enabled by advancements in material science, moving away from the heavy metal bins of the previous era. The material chosen for these modern, wheeled containers was specifically high-density polyethylene, commonly known as HDPE. This plastic offered significant advantages: it provided superior durability against various weather conditions, drastically reduced the overall weight of the container, and was much cheaper and easier to mold into the complex shapes required for integrating features like hinges and wheel mounts compared to working with sheet metal. This material choice directly supported the functional goals of mobility and mechanical compatibility.

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Invention Of The Wheelie Bin 🗑️- When Were Wheeled Bins ...