Post World War II Incendiary Weapons
Modern incendiary bombs usually contain thermite, made from aluminium and ferric oxide. The most effective formula is 25% aluminium and 75% iron oxide. It takes very high temperatures to ignite, but when alight, it can burn through solid steel. In WWII, such devices were employed in incendiary grenades to burn through heavy armor plate, or as a quick welding mechanism to destroy artillery and other complex machined weapons.
A variety of pyrophoric materials can also be used: Selected organometallic compounds, most often triethylaluminium, trimethylaluminium, and some other alkyl and aryl derivates of aluminium, magnesium, boron, zinc, sodium, and lithium, can be used. Thickened triethylaluminium, a napalm-like substance that ignites in contact with air, is known as thickened pyrophoric agent, or TPA.
During the Vietnam War, the U.S. Army developed the CBU-55, a cluster bomb incendiary fueled by propane, a weapon that was used only once in warfare. Napalm proper is no longer used by the United States, although the kerosene-fueled Mark 77 MOD 5 Firebomb is currently in use. The United States has confirmed the use of Mark 77s in Operation Iraqi Freedom.
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