How to Build an Indestructible Time Capsule

Feb 19, 2025

And send a message to... the future.

And send a message to... the future.

3 1/2-inch-diameter PVC pipe, qty. 1

3 1/2-inch-diameter PVC test plug, qty. 1

3 1/2-inch-diameter PVC end cap, qty. 1

Container each, PVC primer and cement, qty. 1

Can spray paint, qty. 1

Measure and mark off with a Sharpie the length of the pipe necessary to hold your contents. We chose 14½ inches.

If the child is at least 12 years old and has some experience, with careful adult supervision she can use a miter saw to crosscut the pipe. If not, a standard eight-point carpentry handsaw is a safe alternative.

Apply PVC primer to the end of the pipe and on the inside of the end cap. (Be sure to open the windows for ventilation.)

Using the applicator tool, spread a thick layer of PVC cement onto the end of the pipe, and a thin layer on the inside of the end cap.

With the PVC pipe upright, tap the end cap on with a dead-blow hammer or mallet. Twist the end cap slightly to evenly distribute the cement, then finish tapping the cap until it is firmly seated.

Fill the time capsule with whatever you like, preferably nonperishable. Be sure to include something that indicates the date of the contents.

Insert the test plug into the pipe and wind the wing nut until it is firmly tightened.

Spray-paint the capsule.

Amanda Bonavita, a 12-year-old from Staten Island, New York, is a participant in the FIRST Robotics Competition. The nationwide tournament encourages kids to pursue careers in engineering and technology.

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