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Physical & Chemical properties

Flammability

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Description of key information

No study data available. 

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Justification for classification or non-classification

Inorganic oxides in which 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 oxidation state of phosphorus in phosphoric acid is in its highest possible state (+5).

In the daily use and handling of phosphoric acid during which continuous exposure to air can occur, no spontaneous ignition is observed. The absence of structural alerts furthermore confirms that it is highly unlikely that phosphoric acid has pyrophoric properties.

Phosphoric acid is mainly used as a dilution in water. Under these use conditions in contact with water no ignition and/or liberation of flammable gases is observed. The absence of structural alerts furthermore confirms that phosphoric acid is not flammable in contact with water.

Based on its chemical nature and the reasoning above, the substance is considered to be non-flammable and testing may be waived as it does not appear scientifically necessary.

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