What are the differences in thermal expansion coefficients among plastic outdoor chair materials?

Plastic outdoor chairs are popular for their durability and affordability, but their performance can vary significantly based on the thermal expansion coefficients of their materials. Common plastics used include polypropylene (PP), high-density polyethylene (HDPE), and polycarbonate (PC), each with distinct thermal behaviors.

Polypropylene has a relatively high thermal expansion coefficient (around 100-150 x 10^-6/°C), making it more prone to dimensional changes in extreme temperatures. HDPE, with a coefficient of about 120-200 x 10^-6/°C, is similarly sensitive but offers better impact resistance. Polycarbonate, though more expensive, has a lower expansion rate (60-70 x 10^-6/°C), providing greater stability in fluctuating climates.

Understanding these differences helps in selecting the right material for specific environments, ensuring longevity and comfort in outdoor seating solutions.