A World War I explosive factory, which was to be later known as NEF Pembrey was built, by Nobel's Explosives, with British Government approval, near the village of Pembrey, Carmarthenshire, Wales. The factory was built on a site consisting of mainly sandhills and sand dunes to provide some protection against damage caused by an explosion. Its main product was TNT (Trinitrotoluene) used for shell filling. The same site was used in World War II to build another explosive factory ROF Pembrey, which also made TNT.