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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.
DIME mixtures have been studied for some time, but apparently only began to be adopted for weapons after the year 2000.
DIME weapons consist of a carbon fiber casing filled with a mixture of explosive and very dense microshrapnel, consisting of very small particles (1–2 mm) or powder of a heavy metal. To date, tungsten alloy (heavy metal tungsten alloy, or HMTA) composed of tungsten and other metals such as cobalt and nickel or iron has been the preferred material for the dense microshrapnel or powder.
Two common HMTA alloys are:
Upon detonation of the explosive, the casing disintegrates into extremely small particles, as opposed to larger pieces of shrapnel which results from the fragmentation of a metal shell casing. The HMTA powder acts like micro-shrapnel which is very lethal at close range (about 4 meters or 13 feet), but loses momentum very quickly due to air resistance, coming to a halt within approximately 40 times the diameter of the charge. This increases the probability of killing people within a few meters of the explosion while reducing the probability of causing death and injuries or damage farther away. Survivors close to the lethal zone may have their limbs amputated (as the microshrapnel can slice through soft tissue and bone) by the HMTA microshrapnel embedded in their body tissue.
The carcinogenic effects of heavy metal tungsten alloys (HMTA) have been studied by the U.S. Armed Forces since at least the year 2000 (along with depleted uranium (DU)). These alloys were found to cause neoplastic transformations of human osteoblast cells.
The tungsten alloy carcinogenicity may be most closely related to the nickel content of the alloys used in weapons to date. However, pure tungsten and tungsten trioxide are also suspected of causing cancer and other toxic properties, and have been shown to have such effects in animal studies.
In 2009, a group of Italian scientists affiliated with the watchdog group New Weapons Research Committee (NWRC) pronounced DIME wounds "untreatable" because the powdered tungsten cannot be removed surgically.
In July/August 2006, doctors in the Gaza Strip reported unusual wounds caused by Israel Defense Forces attacks against Palestinian targets, claiming that they were from a previously unknown weapons. A lab analysis of the metals found in the victims' bodies was reportedly "compatible with the hypothesis" that DIME weapons were involved. Israel denied possessing or using such weapons, and an Israeli military expert said that the wounds were consistent with ordinary explosives.
Dr. Mads Gilbert and Dr. Erik Fosse, working on wounded from the 2008–2009 Israel–Gaza conflict, reported injuries that they believed were caused by some new type of weapon used by Israel, which they suspected were DIME bombs.