Valvash
Valvash is a fictional high-performance ceramic composite described in speculative engineering and worldbuilding literature. It is depicted as a rare material optimized for extreme-pressure and high-temperature valve applications, with a focus on sealing reliability. The name combines valve function and ash-like microstructure, emphasizing its function in fluid control systems.
Valvash is said to consist of a multi-layered ceramic matrix with a glassy interphase and trace amounts
Valvash is said to occur in nature in fictional ultramafic hydrothermal veins or can be produced synthetically