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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties


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Administrative data

Link to relevant study record(s)

Description of key information

In accordance with section 1.1 of Annex XI of the REACH regulation, the flammability study required under information point 7.10 of Annex VII of the same regulation, can be waived if it is scientifically unjustified based on existing data.

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.

In addition, the substance is known to be non-pyrophoric and does not self-heat: it is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied.

Besides, experience with handling of the substance demonstartes it does not emit flammable gases upon contact with water.

Key value for chemical safety assessment

non flammable

Additional information

Ditantalum pentaoxide is an inorganic oxide in which the inorganic element, Tantalum, is in its highest possible oxidation state, +5. Therefore, it has been deemed scientifically unjustified to conduct the flammability study listed under standard information requirement 7.10.

Furthermore, due to the test material being designated as non-flammable under the grounds listed above, the substance is also considered to be non-pyrophoric and non-flammable on contact with water and it is considered justified to also waive those studies.

Justification for classification or non-classification

In view of the oxidation state of the material, no classification for flammability is required in accordance with Regulation (EC) No. 1272/2008 or Directive 67/548/EEC.