At what temperature does aluminum start to lose its strength due to prolonged heat exposure?

Aluminum begins to lose its strength when exposed to elevated temperatures. Specifically, at around 350°F, the mechanical properties of aluminum start to degrade significantly. Prolonged heat exposure causes aluminum to soften, which adversely affects its load-bearing capabilities and structural integrity.

At temperatures above 350°F, the reduction in strength can become critical, especially in construction applications where aluminum is used for support or in structural components. This is particularly important for firefighters and building inspectors to understand, as prolonged exposure to high temperatures can compromise the safety and stability of aluminum structures in fire conditions.

Understanding this threshold is essential for assessing risks and making informed decisions during emergency response situations. The choice at 350°F accurately reflects the critical temperature where significant strength loss begins, making it the correct answer in this context.