Grathin

Grathin is a hypothetical metamaterial described in speculative materials science and science fiction as an ultra-light, exceptionally strong substance with high thermal stability and resistance to radiation.

In proposed models, grathin consists of a multilayer lattice or nanofiber-reinforced matrix, yielding high specific strength, stiffness, and resilience to thermal shock. Its properties are typically described as anisotropic: strength and stiffness vary with orientation, enabling tailored performance.

As a theoretical construct, grathin is studied through computational models and small-scale fabrication concepts; no experimental synthesis has been reported. Proposed production routes include advanced nanofabrication, directed self-assembly, and high-temperature deposition techniques, though these remain speculative.

Potential applications include lightweight aerospace components, protective armor, and energy storage substrates where high strength-to-weight and thermal tolerance are advantageous. Limitations include manufacturability, cost, and long-term stability under real-world conditions; until demonstrated, grathin remains a theoretical or fictional material.

The term has appeared in various speculative writings to illustrate ideas about future metamaterials. It is not recognized as a real material in the current scientific literature.

Related concepts include metamaterials, ultralight alloys, and nanostructured composites.