What additives are commonly used in PVC outdoor flower boxes to enhance UV stability?

PVC outdoor flower boxes are popular for their durability and versatility, but prolonged exposure to sunlight can cause degradation. To enhance UV stability, manufacturers often incorporate specific additives. Common UV stabilizers include:

1. Titanium Dioxide (TiO₂) – A white pigment that reflects UV rays, preventing damage to the PVC structure.

2. Hindered Amine Light Stabilizers (HALS) – These absorb and neutralize free radicals formed by UV exposure.

3. UV Absorbers (UVA) – Such as benzophenones and benzotriazoles, which absorb harmful UV radiation.

4. Carbon Black – Provides both UV protection and color stability, though it limits color options.

5. Lubricants and Impact Modifiers – While not UV stabilizers directly, they help maintain flexibility and prevent cracking under sunlight.

By using these additives, PVC flower boxes can resist fading, brittleness, and cracking, ensuring long-lasting performance in outdoor environments.