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[i]In August 1966, three fire extinguishers, weighing only 5.7 to 6 kilograms, were evaluated for spacecraft 012 and subsequent flights. The extinguisher selected would be stowed on liftoff for the first manned flights. On later missions, it would be mounted in brackets. All three used Freon FE 1301, a most efficient extinguishing agent on the ground. Under space conditions, however, the chemical worked more slowly, required a higher level of saturation of the flammable materials, and, even worse, generated a gas that might, in sufficient quantities, prove fatal to the crew. Other chemicals would of course be tested, but this would take time.[/i]
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