Registration Dossier

Physical & Chemical properties

Flammability

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Link to relevant study record(s)

Description of key information

No study has been performed on trisodium hydrogen diphosphate for the endpoint 'flammability'. An adaptation from the standard testing regime is justified on the following basis:
Trisodium hydrogen diphosphate is not considered to be flammable. The substance is handled and used in air and therefore spontaneous ignition in air (pyrophoricity) is not anticipated. In addition, the substance is not known to be flammable in contact with water. Production of trisodium hydrogen diphosphate takes place at temperatures above 500°C under normal atmospheric conditions; this would not be possible if it were flammable.
According to the guidance on information requirements and chemical safety assessment Chapter R.7a section 7.1.10.3 inorganic compounds where the inorganic element is in its highest possible oxidation state are incapable of further reaction with oxygen and can thus be designated as non-flammable. The phosphorus present in trisodium hydrogen diphosphate is already present in the highest oxidation phase and therefore testing for flammability is considered to be scientifically unjustified.

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Justification for classification or non-classification

Trisodium hydrogen diphosphate is not considered to be classified as flammable in accordance with Regulation (EC) No. 1272/2008 (EU CLP).