| 释义 |
halon, n. Chem.|ˈheɪlɒn|
[f. *halo-2 + -on2.]
Any of a class of compounds in which the hydrogen atoms of a hydrocarbon (usually methane or ethane) are replaced by bromine and other halogens, many of which are gases noted for their lack of reactivity and useful in firefighting. Also halon gas.
1960Nat. Fire Protection Assoc. Q. Oct. 173/2 One agent, bromotri fluoromethane (Halon 1301), was the most effective of the agents evaluated... Bromotri fluoromethane (referred to frequently by its Halon designation 1301) is a liquified compressed gas. 1975Halogenated Fire Suppressants (ACS Symposium Ser. No. 16) Pref. p. ix, Halon is an abbreviation devised by the Army Corps of Engineers to designate halogenated hydrocarbon. If the compound under discussion has the formula CaFbCl3BrdIe , it is designated as halon abcde. Terminal zeros are dropped. 1983Jrnl. Soc. Archivists VII. 168 An automatic release halon system may be installed. 1986Daily Tel. 27 May 8/8 Firefighters who put on breathing masks and entered the small compartment around the hatch to switch on the halon gas fire suppression system. 1991Earth Matters Winter 9/3 Friends of the Earth has caught out ICI who have been aggressively marketing ozone-depleting halons for fire extinguishers to developing countries such as India and Argentina. |