Part 2. The Times capsule. Keywords. time capsule, future, be passed on. Vocabulary. copper, aluminum, stainless, non-rusting, leakproof, humidity, Zimbabwe. A. Do you know what a time capsule is and what it is for? Listen to the following explanation. Fill in the blankets. Time capsules are special devices built to protect papers and other objects usually for 100 years. The purpose is to help people in the future understand what is important when the time capsule is closed. The device is usually made of copper, aluminum or stainless steel.