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Conditions of inerting of methane-air mixtures by carbon dioxide and nitrogen with addition of CF 3 Br, C 2 F 4 Br 2 , and CF 3 I are examined. The value of the minimum inerting concentration of the inerting substance is significantly reduced by introduction of these substances [up to 15%(vol.)] to N 2 and CO 2 . A further increase in CF 3 Br and C 2 F 4 Br 2 concentrations does not reduce the minimum inerting concentration, and an increase in the concentration of CF 3 I above 15%(vol.) drastically increases the latter to values higher than the minimum inerting concentration of pure nitrogen. CF 3 I is found to be a combustible gas, and its addition to a methane-air mixture substantially expands the flammability limits. The flammability limits of CF 3 I in air under standard conditions are determined, and the explosion parameters are measured.

The minimum pressures necessary to ignite vapors of several fluorine-containing monomers and their mixtures were determined in experiments with one type of the igniter, a spiral made of molybdenum-rhenium wire. The energy supplied to the igniter is adjusted to be sufficient for pure tetrafluoroethylene ignition at pressures over 0.6 MPa.

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