What UV stabilizers are added to polypropylene to prevent outdoor bench fading?

Polypropylene (PP) is a popular material for outdoor benches due to its durability and cost-effectiveness. However, prolonged exposure to UV radiation can cause fading and degradation. To combat this, UV stabilizers are added to polypropylene. Common stabilizers include:

1. Hindered Amine Light Stabilizers (HALS) – These are highly effective in scavenging free radicals formed by UV exposure, slowing down degradation.

2. UV Absorbers (UVA) – Compounds like benzophenones and benzotriazoles absorb harmful UV rays, converting them into harmless heat.

3. Carbon Black – A pigment that provides both UV protection and color stability by blocking UV penetration.

4. Nickel Quenchers – Less common now, these additives dissipate UV energy as heat, though environmental concerns limit their use.

Combining these stabilizers ensures long-lasting color and structural integrity for polypropylene outdoor benches. Proper formulation can extend the lifespan of outdoor furniture significantly.