Why is aluminum commonly used for sealing caps?

Aluminum is commonly used for sealing caps primarily because of its lightweight properties. This characteristic is essential in various applications, especially in aerospace and packaging, as it contributes to overall weight reduction without compromising the structural integrity of the seal. Lightweight materials help in improving fuel efficiency and performance in aerospace applications. Additionally, aluminum offers good resistance to corrosion, making it an excellent choice for sealing applications where exposure to different environmental conditions can occur. While other materials may also be considered for sealing caps, aluminum's combination of lightweight nature and other beneficial properties makes it a preferred option in many industries.