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Physical & Chemical properties

Flammability

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Description of key information

Vanadium carbide is not highly flammable.
Vanadium carbide is not pyrophoric.
Vanadium carbide does not emit flammable gases in contact with water.

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Flammability of solids

In the preliminary screening test, vanadium carbide could be ignited at room temperature using a flame as ignition source and it burned over a distance of 200 mm in 29 minutes and 39 seconds. As the burning time in the preliminary screening test was above the trigger values according to EC 440/2008, UN Transport Guideline, as well as GHS and CLP Regulation, further testing was not required. Therefore, vanadium carbide does not require classification as:

·        highly flammable solid according to Directive 67/548/EEC,

·        readily combustible solid in Class 4.1 according to the UN Transport Guideline, or

·        flammable solid according to GHS and CLP Regulation (EC) No 1272/2008.

Pyrophoricity

In accordance with Regulation (EC) No 1907/2006, Annex XI, Section 1, testing for pyrophoric properties of solids is not considered to be required since vanadium carbide is stable at ambient temperature. It also does not contain any chemical groups that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (circa 20 °C). Furthermore, long-term industrial experience in handling shows that vanadium carbide does not ignite (spontaneously) (i.e. the auto ignition temperature is not below room temperature) in contact with air.

Flammability in contact with water

In accordance with Regulation (EC) No 1907/2006, Annex XI, Section 1, testing of flammability in contact with water is not considered to be required since vanadium carbide does not contain groups that might lead to a reaction with water or damp air, leading to the development of dangerous amounts of gas or gases which may be highly flammable. Recent experimental testing for water solubility has also not reported any formation of gases. Furthermore, long-term industrial experience in practical handling of vanadium carbide shows that it does not react with water and will not ignite with water or humid air.

Justification for classification or non-classification

Vanadium carbide could be ignited and burnt over a distance of 200mm within 29 minutes and 39 seconds in a preliminary screening test (according to EU-Method A.10). As the burning time in the preliminary screening test was above the trigger values, further testing was not required. It is concluded that vanadium carbide is not a highly flammable solid.

Vanadium carbide does not need to be classified according to Directive 67/548 EEC and CLP Regulation (EC) No 1272/2008 since:

it is not highly flammable;

explosive properties are considered non-relevant based on the lack of functional groups; and

oxidising properties are considered non-relevant based on the chemical structure.