Suitable for use in aerospace applications, these fire detection feed-thrus are constructed from a variety of metal components and high purity alumina ceramic. The corrosion resistant materials yield a hermiticity that is stable even in severe environments. Component durability is tested by subjecting all ceramic-to-metal assemblies to thermal cycling from -55°F to 1000°F, as well as extended periods at elevated temperatures up to 1,000°F. The feed-thrus are also resistant to vibration and mechanical shock failure, making it ideal for aerospace applications. With a reduced risk of hermetic leakers, the components also offer higher reliability.