What material are aircraft electrical junction boxes typically constructed from in a fire zone?

Aircraft electrical junction boxes located in fire zones are typically constructed from stainless steel due to its fire-resistant properties and durability. Stainless steel can withstand high temperatures and is less likely to deform or fail in the event of a fire, providing added safety for electrical components housed within the junction box. Its ability to resist corrosion further enhances its suitability for the rigors of aviation environments where exposure to various environmental factors can occur.

The other materials mentioned, while they have their own uses in aircraft construction, are not ideal for use in fire zones. Asbestos, despite its historical use for fire resistance, is now largely banned due to health risks. Cadmium-plated steel may provide some protective qualities but is less effective than stainless steel when it comes to withstanding high temperatures. Aluminum, while lightweight and commonly used in aircraft, does not provide the same level of fire resistance as stainless steel, making it less suitable for critical applications in fire-prone areas. Thus, stainless steel is the preferred material for junction boxes in fire zones.