The AUTOSTEM demolition system is based on the use of a cartridge that causes controlled crushing of the rock through the generation of gas. The cartridge confined in a blast hole, when triggered, generates large quantities of harmless gases at high pressure, which, by pressing on the bottom and sides, cause controlled breakage of the rock or of the reinforced concrete structure.
The peculiarity that distinguishes the AUTOSTEM cartridge from other similar demolition systems is its being “self- tamping” that is, the harmless gases that are released following priming of the cartridge, in addition to allowing the crushing described above, activates a mechanism of automatic tamping. When the AUTOSTEM cartridge is ignited in an unconfined context, this is harmless as the pressure exerted following priming is not sufficient to activate the combustion reaction of the compound contained within it. Another factor that makes the AUTOSTEM system safe is the fact that, given the low reaction speed of the powder, an excessive throwing up of material is avoided, thus reducing damage to nearby structures.
Use of the AUTOSTEM System is immediate as, not requiring tamping, the cartridge is lowered directly into a mine hole by the operator, then the leads are connected to the firing line. Once the continuity of the electrical line has been checked with an ohm meter (use only an ohm meter certified for explosives), the cartridges are activated through the exploder (approved). Even if the fragment projections are minimal, it is advisable to identify an evacuation area for added safety.