How does the thermal stability of polyethylene compare to polypropylene in outdoor armchairs?

When selecting materials for outdoor armchairs, thermal stability is a critical factor. Polyethylene (PE) and polypropylene (PP) are two common plastics used in outdoor furniture, but they differ in their response to heat. Polyethylene generally has a lower melting point (around 120-130°C) compared to polypropylene (160-170°C), making PP more resistant to high temperatures. However, PE is more flexible and less prone to cracking in cold weather, while PP becomes brittle at lower temperatures.

In outdoor settings, prolonged exposure to sunlight and heat can cause both materials to degrade, but PP tends to outperform PE in thermal stability due to its higher melting point and better resistance to UV radiation. Additives like stabilizers can enhance the performance of both plastics, but PP is often preferred for hotter climates.

Ultimately, the choice between polyethylene and polypropylene depends on the specific environmental conditions and desired durability of the outdoor armchairs. PP excels in heat resistance, while PE offers better flexibility in varying temperatures.