Product Code Database
[[File:Dynamite Diagram.svg|thumb|Diagram ]] Dynamite is an explosive made of nitroglycerin, (such as powdered shells or clay), and stabilizers. It was invented by the Swedish people chemist and engineer Alfred Nobel in Geesthacht, Northern Germany, and was patented in 1867. It rapidly gained wide-scale use as a more robust alternative to the traditional gun powder explosives. It allows the use of nitroglycerine's favorable explosive properties while greatly reducing its risk of accidental detonation.
Alfred Nobel's father, Immanuel Nobel, was an industrialist, engineer, and inventor. He built bridges and buildings in Stockholm and founded Sweden's first rubber factory. His construction work inspired him to research new methods of blasting rock that were more effective than black powder. After some bad business deals in Sweden, in 1838 Immanuel moved Nobel family to Saint Petersburg, where Alfred and his brothers were educated privately under Swedish and Russian tutors. At the age of 17, Alfred Nobel was grand tour; in the United States he met Swedish engineer John Ericsson and in France studied under famed chemist Théophile-Jules Pelouze and his pupil Ascanio Sobrero, who had first synthesized nitroglycerin in 1847. Pelouze cautioned Nobel against using nitroglycerine as a commercial explosive because of its great sensitivity to shock.
In 1857, Nobel filed the first of several hundred , mostly concerning air pressure, gas and fluid gauges, but remained fascinated with nitroglycerin's potential as an explosive. Nobel, along with his father and brother Emil, experimented with various combinations of nitroglycerin and black powder. Nobel came up with a way to safely detonate nitroglycerin by inventing the detonator, or blasting cap, that allowed a controlled explosion set off from a distance using a fuse. In 1863 Nobel performed his first successful detonation of pure nitroglycerin, using a blasting cap made of a copper percussion cap and mercury fulminate. In 1864, Alfred Nobel filed patents for both the blasting cap and his method of synthesizing nitroglycerin, using sulfuric acid, nitric acid and glycerin. On 3 September 1864, while experimenting with nitroglycerin, Emil and several others were killed in an explosion at the factory at Immanuel Nobel's estate at Heleneborg. After this, Alfred founded the company Nitroglycerin Aktiebolaget in Vinterviken to continue work in a more isolated area and the following year moved to Germany, where he founded another company, Dynamit Nobel.
Despite the invention of the blasting cap, the instability of nitroglycerin rendered it useless as a commercial explosive. To solve this problem, Nobel sought to combine it with another substance that would make it safe for transport and handling but would not reduce its effectiveness as an explosive. He tried combinations of cement, coal, and sawdust, but was unsuccessful. Finally, he tried diatomaceous earth, which is fossilized algae, that he brought from the Elbe River near his factory in Hamburg, which successfully stabilized the nitroglycerin into a portable explosive.
Nobel obtained patents for his inventions in England on 7 May 1867 and in Sweden on 19 October 1867.Schück & Sohlman (1929), p. 101. After its introduction, dynamite rapidly gained wide-scale use as a safe alternative to black powder and nitroglycerin. Nobel tightly controlled the patents, and unlicensed duplicating companies were quickly shut down. A few American businessmen got around the patent by using absorbents other than diatomaceous earth, such as resin.US Patent 234489 issued to Morse 16 November 1880
Nobel originally sold dynamite as "Nobel's Blasting Powder" and later changed the name to dynamite, from the Ancient Greek word dýnamis (δύναμις), meaning "power".
Dynamite is usually rated by "weight strength" (the amount of nitroglycerin it contains), usually from 20% to 60%. For example, 40% dynamite is composed of 40% nitroglycerin and 60% "dope" (the absorbent storage medium mixed with the stabilizer and any additives).
Over time, regardless of the sorbent used, sticks of dynamite will "weep" or "sweat" nitroglycerin, which can then pool in the bottom of the box or storage area. For that reason, explosive manuals recommend the regular up-ending of boxes of dynamite in storage. Crystals will form on the outside of the sticks, purportedly causing them to be even more sensitive to shock, friction, and temperature. Therefore, while the risk of an explosion without the use of a blasting cap is minimal for fresh dynamite, old dynamite is dangerous. Modern packaging helps eliminate this by placing the dynamite into sealed plastic bags and using wax-coated cardboard.
Dynamite is moderately sensitive to shock. Shock resistance tests are usually carried out with a drop-hammer: about 100 mg of explosive is placed on an anvil, upon which a weight of between is dropped from different heights until detonation is achieved.Carlos López Jimeno, Emilio López Jimeno, Francisco Javier Ayala-Carcedo, Drilling and Blasting of Rocks, translated by Yvonne Visser de Ramiro from Manual de perforación y voladura de rocas (1987), Geomining Technological Institute of Spain (Instituto Tecnológico Geominero de Espan~a), Taylor & Francis, London and New York, 1995, With a hammer of 2 kg, mercury fulminate detonates with a drop distance of 1 to 2 cm, nitroglycerin with 4 to 5 cm, dynamite with 15 to 30 cm, and ammoniacal explosives with 40 to 50 cm.
There were two large explosions at the Somerset West plant during the 1960s. Some workers died, but the loss of life was limited by the modular design of the factory and its earth works, and the planting of trees that directed the blasts upward. There were several other explosions at the Modderfontein factory. After 1985, pressure from trade unions forced AECI to phase out the production of dynamite. The factory then went on to produce ammonium nitrate emulsion-based explosives that are safer to manufacture and handle.
Currently, only Dyno Nobel manufactures dynamite in the US. The only facility producing it is located in Carthage, Missouri, but the material is purchased from Dyno Nobel by other manufacturers who put their labels on the dynamite and boxes.
Aside from both being high explosives, TNT and dynamite have little in common. TNT is a second-generation castable explosive adopted by the military, while dynamite, in contrast, has never been popular in warfare because it degenerates quickly under severe conditions and can be detonated by either fire or a wayward bullet. The German armed forces adopted TNT as a filling for artillery shells in 1902, some 40 years after the invention of dynamite, which is a first-generation phlegmatized explosive primarily intended for civilian earthmoving. TNT has never been popular or widespread in civilian earthmoving, as it is considerably more expensive and less powerful by weight than dynamite,J. Köhler, R. Meyer, A. Homburg: Explosivstoffe. Zehnte, vollständig überarbeitete Auflage. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 2008, . as well as being slower to mix and pack into boreholes. TNT's primary asset is its remarkable insensitivity and stability: it is waterproof and incapable of detonating without the extreme shock and heat provided by a blasting cap (or a sympathetic detonation); this stability also allows it to be melted at , poured into high explosive shells and allowed to re-solidify, with no extra danger or change in the TNT's characteristics.Gibbs, T. R. & Popolato, A. LASL Explosive Property Data. Los Alamos National Laboratory, New Mexico. United States Department of Energy, 1980. Accordingly, more than 90% of the TNT produced in the United States was always for the military market, with most TNT used for filling shells, hand grenades and aerial bombs, and the remainder being packaged in brown "bricks" (not red cylinders) for use as satchel charge by combat engineers.
It is rated by either "weight strength" (the amount of ammonium nitrate in the medium) or "cartridge strength" (the potential explosive strength generated by an amount of explosive of a certain density and grain size used in comparison to the explosive strength generated by an equivalent density and grain size of a standard explosive). For example, high-explosive 65% Extra dynamite has a weight strength of 65% ammonium nitrate and 35% "dope" (the absorbent medium mixed with the stabilizers and additives). Its "cartridge strength" would be its weight in pounds times its strength in relation to an equal amount of ANFO (the civilian baseline standard) or TNT (the military baseline standard). For example, 65% ammonium dynamite with a 20% cartridge strength would mean the stick was equal to an equivalent weight strength of 20% ANFO.
|
|
