How does the addition of carbon black improve polyethylene outdoor armchair UV resistance?

The addition of carbon black significantly improves the UV resistance of polyethylene outdoor armchairs by acting as a protective shield against sunlight degradation. Carbon black absorbs and disperses harmful ultraviolet (UV) radiation, preventing it from breaking down the polymer chains in polyethylene. This process reduces photo-oxidation, which can cause fading, brittleness, and structural weakening over time.

Polyethylene, while durable, is inherently susceptible to UV damage when exposed to prolonged sunlight. Carbon black particles embedded in the material act as stabilizers, scattering UV rays and minimizing direct exposure to the polymer matrix. This additive also enhances thermal stability, further protecting the armchair from environmental stress.

For outdoor furniture, this means extended lifespan, retained color vibrancy, and maintained mechanical strength. Manufacturers often use finely dispersed carbon black at optimal concentrations (typically 2-5%) to balance UV protection with material flexibility. The result is a weather-resistant polyethylene armchair capable of withstanding years of outdoor use without significant degradation.