Word: halogenated
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Dates: during 1950-1959
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...fluorine, most tricky of the halogen series (others: iodine, bromine), is a nightmare to handle and hideously corrosive. To stay liquid, it must be kept at - 306° F., and if it merely touches water it will start a 5,000° F. explosion. Now Bell says it has actually harnessed this violence, even in small rocket thrust chambers. The chambers were specially designed laboratory chambers. Their metals are still classified, and so is the ingredient used with fluorine (possibly ammonia or hydrazine). Very special handling also involved unusual welding techniques, new storage tanks, refrigerated pipelines...