Bang.

The HELLHOUND 40mm Low Velocity Multi-Purpose Grenade is a fixed type ammunition designed to be fired from a 40mm Grenade Launcher M79, M203 (attached to the M16/M16A1/M16A2 rifle) or Milkor MK-1/[MGL-140]. The round consists of an A5-filled metal projectile body with a rotating band, a point-initiating-base detonating fuze with Safe and Arm technology, and a cartridge case assembly. Upon impact with the target, the firing pin is driven into the detonator, which in turn initiates the spit back charge, producing a jet which initiates the explosive train from the base forward, resulting in an armor-piercing jet of molten metal and fragmentation of the projectile body. With twice the fill amount of an M433 and a 40% increase in the shrapnel pattern and a lethal diameter out to 10 meters, the HELLHOUND will provide superior performance against both Troops in the Open and MOUT type engagements, while providing superior door-breaching capabilities.

from Master Blaster on military.com

THERMOBARIC

  1. The initial anaerobic detonation reaction, microseconds in duration, is primarily a redox reaction of molecular species. The initial detonation reaction defines the system’s high pressure performance characteristics: armor penetrating ability.
  2. The post detonation anaerobic combustion reaction, hundreds of microseconds in duration, is primarily a combustion of fuel particles too large for combustion in the initial detonation wave. The post detonation anaerobic reaction define the system’s intermediate pressure performance characteristics: Wall/Bunker Breaching Capability.
  3. The post detonation aerobic combustion reaction, milliseconds in duration, is the combustion of fuel rich species as the shock wave mixes with surrounding air. The post detonation aerobic reaction characteristics define the system’s personnel / material defeat capability: Impulse and Thermal Delivery. Aerobic combustion requires mixing with sufficient air to combust excess fuels. The shock wave pressures are less than 10 atmospheres. The majority of aerobic combustion energy is available as heat. Some low pressure shock wave enhancement can also be expected for personnel defeat. Personnel / material defeat with minimum collateral structure damage requires maximum aerobic enhancement and the highest energy practical fuel additives: Boron, Aluminum, Silicon, Titanium, Magnesium, Zirconium, Carbon, or Hydrocarbons.