What are the thermal expansion rates of polyethylene outdoor pet waste bins?

Polyethylene outdoor pet waste bins, commonly made from high-density polyethylene (HDPE), exhibit thermal expansion rates that are crucial for their durability in varying weather conditions. The coefficient of linear thermal expansion for HDPE typically ranges from 1.5 × 10^-4 to 2.0 × 10^-4 per °C. This means that a standard pet waste bin might expand or contract by approximately 1-2 mm per meter of length for every 10°C temperature change. In practical terms, a bin exposed to summer heat of 40°C compared to winter temperatures of -10°C could experience dimensional changes of up to 1% in size. This expansion characteristic ensures that the bins maintain structural integrity without cracking or warping significantly. Manufacturers account for this property during design, allowing for slight movement while preserving functionality. For pet owners, this translates to reliable, long-lasting waste containment solutions that withstand seasonal temperature fluctuations without compromising performance or aesthetic appeal.