Boundil

Boundil is a fictional material that appears in speculative fiction and hypothetical discussions of advanced materials. It is described as an ultra-high-strength, lightweight crystalline solid with exceptional thermal stability and resistance to radiation.

Different authors vary boundil's exact composition and structure, but common depictions assign it a dense, cross-linked lattice with minimal thermal expansion and a very high melting point. Some writers also attribute unusual electrical or superconducting properties to boundil, though these claims are narrative devices rather than established science.

In most fictional treatments, boundil is produced by advanced synthesis methods such as bound-lattice crystallization or high-energy plasma deposition from boundite-rich feedstocks. There is no real-world process to create boundil; its existence is confined to imagined contexts.

Within its fictional universes, boundil enables durable spacecraft hulls, ultra-efficient energy storage systems, and radiation shielding far surpassing conventional materials. Its imagined performance often serves as a benchmark for discussing limits of materials science.

Boundil's name appears across works without a single canonical origin, reflecting its status as a trope of theoretical materials science. It is not a recognized material in real-world science.