Can foam aluminum catch fire?

Aluminum Foam resembles a metal sponge filled with air bubbles, and its unique closed-cell structure is what gives it itsfire-resistant properties. Although pure aluminum has a melting point of approximately 660°C, the air layers within the Aluminum Foam form a natural thermal barrier; even when exposed to an open flame, it will only oxidize on the surface and will not sustain combustion. Experiments have shown that at temperatures of 800°C, aluminum foam will only slowly soften and deform, without producing open flames or intense combustion.

Dual Protection from a Porous Structure

• Physical Barrier: Countless independent air bubbles block heat transfer, delaying overall temperature rise;
• Chemical Stability: The surface layer of aluminum oxide prevents further oxygen penetration;
• Low Thermal Conductivity: With 60%–90% air content, heat cannot spread rapidly;
• No Volatile Emissions: Unlike plastic foam, it does not release flammable gases at high temperatures;

Comparison with Other Metallic Materials

Compared to traditional solid aluminum, foam aluminum offers superior fire resistance. Under the same high-temperature conditions, solid aluminum plates conduct heat more rapidly, leading to structural failure, whereas foam aluminum retains its shape for a longer period. Compared to steel, foam aluminum does not undergo a red-hot softening phase, providing more stable support during sudden fires. However, it should be noted that prolonged exposure to extreme high temperatures will still cause structural collapse.