Dense Inert Metal Explosive (DIME) is an experimental type of explosive that has a relatively small but effective blast radius. It is manufactured by producing a homogeneous mixture of an explosive material (such as phlegmatized HMX or RDX) and small particles of a chemically inert material such as tungsten. It is intended to limit the distance at which the explosion causes damage, to avoid collateral damage in warfare.
The phrase inert metal refers to a metal that is not chemically active and therefore not part of the chemical reaction that causes the explosion, as opposed to some metals, such as aluminium, that do form part of the chemical reaction—e.g. in Tritonal.
An emerging criticism of DIME weapons is that they might turn out to have strong biological effects in those who are hit by the micro-shrapnel from these types of explosives.
DIME mixtures have been studied for some time, but apparently only began to be adopted for weapons after the year 2000.