Forms
Napalm B is chemically distinct from its predecessor Napalm. It is usually a mixture of polystyrene and benzene, used as a thickening agent to make jellied gasoline. One of the advantages of this new mixture lies in its increased safety while being handled and stored. Many accidents had been attributed to personnel smoking around stockpiles.
Napalm B has a commonly quoted composition of 21% benzene, 33% gasoline (itself containing between 1% and 4% (estimated) benzene to raise its octane number), and 46% polystyrene. This mixture is more difficult to ignite than napalm. A reliable pyrotechnic initiator, often based on thermite (for ordinary napalm) or white phosphorus (for newer compositions), has been used. The original napalm usually burned for 15 to 30 seconds while napalm B can burn for up to 10 minutes.
Napalm B was used in flamethrowers and bombs by American and Allied forces in World War II. It is believed by some that Napalm B is formulated to burn at a specified rate and to adhere to surfaces to increase its stopping power. During combustion, Napalm rapidly deoxygenates the available air and generates large amounts of carbon monoxide and carbon dioxide. Napalm bombs were used during the Vietnam War.
Napalm was also used during the Korean War, most notably during the defense of "Outpost Harry" in South Korea during the night of June 10–11, 1953.
Alternative compositions exist for different uses, e.g. triethylaluminium, a pyrophoric compound that aids ignition.
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