brutoloon

Brutoloon is a fictional material described in speculative science, science fiction, and world-building literature. The term is applied to a dense, viscoelastic substance that can behave as a solid under brief stress and flow under sustained load, giving it a combination of strength and damping.

Physically, brutoloon is reported to exhibit high impact resistance, good thermal stability, and low thermal conductivity. Descriptions vary, but most sources agree it can be formulated as a family of polymers with tunable glass transition temperatures and refractive indices, ranging from translucent to opaque blue-gray. The standard variant is said to have a density between 1.2 and 1.6 g/cm3 and a yield strength exceeding many conventional polymers.

Brutoloon is described as being synthesized by a multi-step polymerization of prepolymers A and B, sometimes with inorganic fillers to enhance stiffness. In some depictions, it occurs naturally as a mineral deposit on a fictional world, while in others it is an engineered material produced in specialized facilities. Reports place its discovery in the late 21st or early 22nd century by explorers and engineers.

Applications in the literature include protective skins for spacecraft, vibration damping layers, thermal barriers, and components in energy storage devices. The material is valued for its combination of toughness, lightness, and adaptability, though cost and production challenges limit widespread use in the stories.