Registration Dossier

Physical & Chemical properties

Flammability

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Description of key information

Not flammable

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Based on inherent substance properties.

Justification for classification or non-classification

The substance has use as a flame retardant, it does not support combustion. In a fire, the mechanism of action of the flame retardant is primarily one by which phosphorus interferes with the combustion process, in the solid and gas phases, to produce a ‘char’ via formation of phosphoric acid. This char acts as a barrier and in turn prevents further oxygen reaching the site of combustion and the fire is ‘starved’ of fuel. The presence of the halogen – chlorine atoms – also aids this process in that they scavenge free radicals formed in the gaseous phase of the fire and consequently decreases the release of flammable volatiles.

The substance is not “extremely flammable” or “flammable” as referenced by the flash point (Method A9) and auto ignition temperature (Method A15).

Based on the known chemical and physical properties of the substance and its chemical structure, negative results are predicted for the following flammability test of Commission directive 84/449/EEC, hence it is considered justified to omit; Method A12 flammability in contact with moisture.

In contact with water or damp air, this substance will not react to produce hazardous gases.

Conclusion: Based on the known chemical and physical properties of the test subsance, negative results are predicted for the flammability test. A derogation in respect of this test was requested and accepted by TCNES.