What are the fire resistance properties of aluminum versus cast iron outdoor sculptures?

When selecting materials for outdoor sculptures, fire resistance is an important consideration, especially in areas prone to wildfires or high temperatures. Aluminum and cast iron are two popular choices, but their fire resistance properties differ significantly.

Aluminum has a relatively low melting point of around 660°C (1220°F), but it is non-combustible and does not catch fire. When exposed to high heat, aluminum forms a protective oxide layer that slows further degradation. However, extreme heat can cause structural weakening or deformation.

Cast iron, on the other hand, has a higher melting point of approximately 1200°C (2192°F) and is highly resistant to fire. Its dense structure makes it less likely to warp or lose integrity under intense heat. However, cast iron can become brittle if subjected to rapid temperature changes.

For outdoor sculptures in fire-prone areas, cast iron may offer better long-term durability, while aluminum provides a lighter, rust-resistant alternative with moderate heat tolerance. Both materials have advantages, but the choice depends on environmental conditions and artistic requirements.