Time capsules are designed to be resilient by nature. But no time capsule has survived as long as designers hope “America’s Time Capsule” will.

The time capsule, designed for the semiquincentennial of the U.S. founding, is being created by America250, the nonpartisan, congressionally mandated group organizing commemorations for this year. The plan is to bury the time capsule underground in Philadelphia at Independence National Historical Park on July 4, and for it to be opened in another 250 years, in 2276.

The problem is time capsules, which are typically buried underground, and exposed to the elements,........

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