Abstract
Abstract The inhalation toxicities (14-day LC50 values for 15-minute exposures) of the pyrolysis products of two fire extinguisher compounds, CH2BrCl and CBrF3, were determined for albino rats. Both compounds, currently used by the USAF for aircraft fires, were pyrolyzed at 800°C in hydrogen-oxygen flame. The principal constituents of the pyrolysis products were identified and quantitated. The determined LC50 value of 2300 ppm for pyrolyzed CBrF3 produced a hydrogen fluoride concentration of 2480 ppm consistent with the reported LC50 value for a single 15-minute exposure to this gas. The pyrolysis products generated from a concentration of 465 ppm of CH2BrCl killed 50% of rats exposed for 15 minutes. The toxic response producing this LC50 value appeared to result from a mixture of hydrogen chloride, hydrogen bromide, and bromine gases.
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