The mine consists of a glass bowl, in diameter containing an explosive charge and a detonator. The top of the mine was covered by a sheet-glass disk thick, under a thick, molded glass pressure plate. Each mine was supplied with a small quantity of cement putty to seal gaps between the main body and the glass disk cover and make the mine waterproof. When stepped on, the pressure plate shattered the glass disk and activated the detonator, detonating the mine's main explosive charge. This was a Sprengkörper 28 – a standard demolition charge with of explosive. Two types of detonator were used. Early versions of the mine used a mechanical detonator, known as a Hebelzünder 44 which used a percussion cap. Later versions fired the main charge using a device known as a Buck igniter. The Buck igniter was a small can of thin, corrugated aluminium. This contained a glass ampule of sulfuric acid, surrounded by flash powder that included powdered naphthalene. The can crushed when subjected to a pressure of around, shattering the ampule and causing the acid to mix with the powder. The resulting chemical reaction produced a flash that ignited the detonator of the main explosive charge. In 1944 and 1945, 11 million mines were produced; at the end of World War II, 9.7 million were still in stock. Along with other companies, the Glashütte Gifhorn participated in the production.
Effect and legacy
Glass shrapnel was not easily detectable via X-Rays, which renderedmedical assistance to victims much harder than conventional mines. Glass also carried an increased infection risk; moreover, life-threatening injuries were more difficult to assess. Mines of this type are still buried in the Eifel National Park on the grounds of the Vogelsang Military Training Area, a former "Nazi leadership" training center. Demining areas with this type of mine is resource intensive, as the fields must be swept either by hand or with mine flails like the Keiler, not forgetting that the latter has a certain margin of error since it was developed with military-tactical deployments in mind. In 2004, "home-made" mines of this type were employed by guerrillas in Colombia.
