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METAL FIRESPotassium, sodium and calcium water decompose readily, liberatinghydrogen. These metals are all used in industry but not as widely as the "lightmetals which are widely used in aircraft and motor vehicles industries and inthe trades where lightness is attribute is desirable. Magnesium, some of itsand titanium alloys products are easily ignited when in the forms of wire, powder,turnings of swarf: aluminum in similar forms is capable of burning.The dusts may form inflammable and explosives mixture with air.Water applied to any of these fires is decomposed, giving off hydrogen,which aggravates the fire and may give rise to explosions which wouldScatter the burning metal. Other metals too, e.g. zinc, in finely-dividedform are combustible.Water, foam, carbon tetrachloride, methyl, a major, chlorobromomethaneor carbon dioxide, in fact, none of the usual extinguishers may be used onmetal fires. They are all ineffective and most of them are dangerous, becausethey are liable either to cause the explosion or to do more harm than good byscattering the burning metal.Gas-expelled dry powder extinguishers are unsuitable for the latterreason, but there is one specially-constructed model which dischargesthrough a long tube in a cone-shaped nozzle by which powder is deliveredlightly onto the fire. The solid extinguishing agents that find little application infirefighting generally, are of value in dealing with metal fires. They must beapplied gently in order to cover the burning metal without disturbing it, andcare is necessary, as some scattering may, nevertheless, to occur. Dry sand,TALC, a mixture of asbestos dust and graphite may be used. Asbestos handclothesor blankets are useful where small quantities of metal are involved,not so much to extinguish the fire as to prevent its spread.
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