Park chairs are designed to withstand harsh outdoor conditions, including prolonged exposure to sunlight, rain, and temperature fluctuations. One of the primary ways they prevent plastic degradation is through the use of UV-resistant materials. Manufacturers often incorporate additives like stabilizers and pigments into the plastic to block harmful ultraviolet rays, which can cause cracking and fading over time.

Additionally, high-density polyethylene (HDPE) and polypropylene are commonly used due to their durability and resistance to environmental stressors. These materials are less prone to warping or becoming brittle. Some park chairs also feature reinforced structures or coatings that further protect against moisture and chemical damage.

Regular maintenance, such as cleaning and occasional treatments with protective sprays, can extend their lifespan. By combining advanced materials and smart design, park chairs remain functional and aesthetically pleasing for years, even in demanding outdoor settings.