Goma-2 Eco is a type of high explosive manufactured for industrial use (chiefly mining) by Unión Española de Explosivos S.A.
It is a gelatinous, Nitroglycol-based explosive widely used within Spain and exported abroad. It was used by ETA in the 1980s and 1990s.
There are two variants of Goma-2: Goma-2 EC and Goma-2 ECO.
Goma-2 ECO was the explosive used in the 11 March 2004 Madrid train bombings.