Your right about using the thin plastic reaction vessels when you can. I used small, HDPE test tubes when I made M.E.K.P. and other sensitive primaries, when it was possible.
Yes, the plastic can still fragment and produce shrapnel, but it is of much less density, so it travles slower and less distance. A rigged up blast shield or fumehood curtian is a great idea. Or a face shield. At the very leas, goggles.
You took into account the extreme toxicity of the sodium azide as well, I assume.
Nice video. Thanks Ral.
I am sorry to everyone for the spelling as of late from me. My only connected device at the moment is a crappy "blackberry, style cheap phone. The buttons are tiny, my thumbs large and insensitive and weathered from manual labor. The browser also lack a spellchecker or auto correct feature, and the built in predictive text feature is so difficult to work that it ends up making things worse, when coupled with the prevously mentioned thumb hinderance. And, I am just a terrible speller, and have been known to abuse commas, also. I will try and upgrade soon.
[Edited on 22-4-2013 by Bot0nist]
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
Lead azide, which is toxic, is a basic component of munitions and detonators. LMU chemists have now synthesized a novel primary explosive that contains no lead.
Primary explosives require careful handling, not only because of the ease with which they can be detonated, but also because the metal common to the two compounds most often employed for this purpose – lead azide and lead styphnate – is toxic and carcinogenic. Long-term use of these materials thus results in significant levels of environmental contamination. A research group at LMU's Department of Chemistry, led by Professor Thomas M. Klapötke, has therefore developed a novel primary explosive which is free of heavy metals. The new material is described in a paper that appears in the journal Angewandte Chemie.
"The sole metal present in K2DNABT, our new explosive, is potassium, an element that is both ecologically and toxicologically innocuous. With respect to its sensitivity to shock, friction and static electricity, the new material is at least as stable as lead azide, as our laboratory experiments have shown," says Klapötke.
Primary explosive materials are used to initiate the detonation of less sensitive secondary explosives. The former can be ignited by applying a mechanical shock, which rapidly generates a propagating shock wave that is sufficiently powerful to detonate the secondary explosive. As a result, the lead azide is converted into elemental lead and released in the form of fine particulates. "Each detonation releases a few milligrams of finely divided lead, but the toxic effect depends on the overall concentration. The deleterious effects on the environment are most obvious in military training grounds, where lead release has occurred regularly for decades and the metal has accumulated to critical levels." Soldiers and civilian personnel who are responsible for the care and use of weapon systems are also regularly exposed to its toxic effects. "Studies carried out by the US Army demonstrate that particularly those who are employed in clean-up operations in these areas have higher levels of lead in the blood than do military personnel who have had no contact with explosives."
Lead azide-based explosive materials are used in both military and non-military contexts. "The ammunition currently used by police forces, and the detonators used in mining and other industries generally contain lead azide," says Klapötke. "According to the US Army, some 10 million lead azide-containing devices, everything from cartridges to detonators, are produced in the US every year, and the military sector alone consumes around 750 pounds of the compound annually.
Initial experimental detonation tests of K2DNABT carried out in the laboratory, as well as theoretical calculations, have shown that, in terms of its chemical properties, the new material offers several advantages over lead azide. "We have reason to believe that it has high long-term stability, and can be stored for many years. That would be a significant advantage relative to DBX-1, a copper-containing agent previously developed as an alternative for lead azide which, however, can decompose over time," says Klapötke. The researchers' next task is to synthesize larger quantities of the new compound, which will then be tested outside the confines of the chemistry lab.
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