Thermocrete was tougher than 20th century concrete and lasted 15% longer. It was a semi-synthetic formulation that could be wetted to various consistencies, including a slurry for castings or doughy for repairs. Its strength was based on chemical reactions in its makeup rather than the quantity of water added to it. After setting, it could be built on immediately, and after cooling was not prone to dusting or cracking.
Engineers could build a thermocrete structure within an hour using pre-made forms and excavators. Because it contained a large concentration of silicon, thermocrete also made an excellent insulator. (Stardate Magazine vol. 2 (1985), Issue 9: "Quartermaster Corps: Thermocrete")
An underground bunker in the House of Martok's compound had reinforced thermocrete walls that could withstand a disruptor blast from a Klingon bird-of-prey fired at point blank range. (DS9 novel: The Left Hand of Destiny)
The Klingon research facility on Zeta Aurigae IV was built using reinforced thermocrete. Starfleet Intelligence agent Bridget McLellan was able to escape past the thermocrete wall by blasting a hole in the wall with her phaser. (VAN - Declassified novella: The Stars Look Down)
On Daran V, most of the buildings in District L in the capital city of Daraniss were made out of a particularly poor grade of thermocrete. As a result, by the mid 2280s, many were in some state of disrepair. (FASA RPG module: Old Soldiers Never Die)
- TOS episode & Star Trek 4 novelization: The Devil in the Dark
- TOS novel: Burning Dreams
- TNG - Cold Equations novel: Silent Weapons
- DS9 novel: The Left Hand of Destiny
- VAN - Declassified novella: The Stars Look Down
- ST - The Fall novel: A Ceremony of Losses
- ST - The Fall novel: Peaceable Kingdoms
- FASA RPG module: Old Soldiers Never Die
- Stardate Magazine vol. 2 (1985), Issue 9: "Quartermaster Corps: Thermocrete"