Because of its low brisance, black powder causes fewer fractures and results in more usable stone compared to other explosives, making black powder useful for blasting monumental stone such as granite and marble. Black powder is well suited for blank rounds, signal flares, burst charges, and rescueline launches.
Low explosives. Low explosives are compounds where the rate of decomposition proceeds through the material at less than the speed of sound. The decomposition is propagated by a flame front (deflagration) which travels much more slowly through the explosive material than a shock wave of a high explosive.
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These materials have low shock power, enough to break the marble while doing minimum shattertype damage to the gems. It seems more economically viable than using more powerful explosives like dynamite. Miners in Mogok have demonstrated a high degree of skill at using such explosives.
Low explosives are mostly solid combustible materials that decompose rapidly but do not normally detonate. This action is known as "deflagration."Upon ignition and decomposition, low explosives develop a large volume of gases that produce enough pressure to propel a projectile in a definite direction.
Emulsion is found the most efficient explosive for blasting of calcitic marble with efficiency of 62%, Slurry is the most efficient explosive for blasting of dolomitic marble with efficiency of 64% and ANFO is found inefficient for all selected rocks except to be used as low explosive combined with other higher explosive.
In explosive: Types of chemical explosives explosives and (2) deflagrating, or low, explosives. Detonating explosives, such as TNT and dynamite, are characterized by extremely rapid decomposition and development of high pressure, whereas deflagrating explosives, such as black and smokeless powders, involve merely fast burning and produce relatively low pressures.
Explosives can be classified into one of four large categories: primary, low, high, and nuclear explosives. Primary explosives. Primary explosives are generally used to set off other explosives. They are very sensitive to shock, heat, and electricity and, therefore, must be handled with great care.
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Propellant for gun bullet or rockets, fireworks, and special effects are the most common applications for low explosives. But even though high explosives are safer, low explosives are still in use today in some countries for mining applications, basically for cost reasons. In the US, Black Powder use for civil use is outlawed since 1966.