Toxic vapours

Toxic vapours are characterised by the release into the atmosphere of gaseous substances.

They can be of varying origins:

  • Pressurised gas: phosgen, ethylene oxide, vinyl chloride, ammonia or even chlorine
  • Decomposition in water: TiCl4, POCl3, SOCl2
  • Thermal reaction: silanes
  • Concentrated solutions: hydrochloric acid, ammonia

These products have a high destructive power over conventional foams; in some cases the application of foam is formally discouraged because the reaction can be violent.

The application of a specially designed foam is needed and in all cases, a prior technical study will make it possible to understand each risk.

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