Thermal concrete was a material composed mostly of silicon, used by Starfleet in the 23rd century in the construction of emergency shelters.

In 2267, Doctor McCoy used one hundred pounds of thermal concrete to bandage a wound on the silicon-based lifeform known as a "Horta". (TOS: "The Devil in the Dark")

External linkEdit

• Thermal concrete at Memory Beta, the wiki for licensed Star Trek works