What is typically the primary material used in the construction of fuel tanks in aircraft?

The primary material used in the construction of fuel tanks in aircraft is aluminum. Aluminum is favored due to its excellent strength-to-weight ratio, resistance to corrosion, and malleability, which allows for the creation of complex shapes that fit into the aircraft's design. Additionally, aluminum's lightweight properties contribute to overall fuel efficiency and performance, which are critical considerations in aviation.

While other materials like plastic, steel, and composite materials are used in various aircraft components, they do not typically match aluminum's properties for fuel tank construction. Plastic may be lighter and resistant to corrosion, but it may not provide the same structural integrity or fuel compatibility. Steel, although very strong, is much heavier than aluminum, which could negatively impact the aircraft's weight and performance. Composite materials, while increasingly used in modern aircraft for various components, have not become the primary choice for fuel tanks due to cost and manufacturing complexities associated with ensuring fuel compatibility and structural durability. Thus, aluminum remains the standard material for fuel tank construction in the aviation industry.