Diiron trioxide

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

pyrophoric solids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance 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

Reference 2

Endpoint:

self-heating substances / mixtures

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water

Reference 4

Endpoint:

flammable solids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Principles of method if other than guideline:

expert judgement

GLP compliance:

no

In this compound, the iron ion is already in its maximum oxidation stage of +III. Further oxidation is not possible. Therefore, this substance will now react with oxygen or air. The substance is not flammable.

Executive summary:

In accordance with column 1 of REACH Annex IX, information is not required, as the stability of the substance is considered to be not critical. In this compound, the iron ion is already in its maximum oxidation stage of +III. Further oxidation is not possible. Therefore, this substance will now react with oxygen or air. The substance is not flammable.

Description of key information

a) Flammability: The study does not need to be conducted.  In diiron trioxide, the iron ion is already in its maximum oxidation stage of +III. Further oxidation is not possible. Therefore, this substance will not react with oxygen or air. Diiron trioxide is not flammable.

b) Pyrophoric properties: In accordance with CLP Annex I, 2.9.4 and 2.10.4, a study on pyrophoric properties does not need to be conducted as it is scientifically unjustified. Based on experience during handling and use, no pyrophoric properties were observed and the structure does not give a reference to pyrophoric properties.

c) Flammability on contact with water: A study does not need to be conducted as the substance is an inert oxide which does not react with water. Flammable gases are not formed in contact with water.

d) Self- ignition temperature: In diiron trioxide, the Iron ion is already in its maximum oxidation stage of +III. Further oxidation is not possible.

Therefore, this substance will not react with oxygen or air, and self-heating cannot occur.

e) Organic peroxide: In accordance with part 2, section 2.15 of Annex I of the CLP Regulation 1272/2008, the substance does not need to be assessed for organic peroxide properties, as based on its chemical structure,  diiron trioxide is not an organic peroxide.

f) Self-reacting properties: In accordance with Annex I, part 2, section 2.8 of the CLP regulation 1272/2008, a study does not need to be conducted, as there are no chemical groups present in the molecule associated with explosive or self-reactive properties; examples of such groups are given in Tables A6.1 and A6.2 in Appendix 6 of the UN RTDG, Manual of Tests and Criteria.

Key value for chemical safety assessment

Flammability:

non flammable

Justification for classification or non-classification

Diiron trioxide is not flammable, it has no pyrophoric properties, no flammability in contact with water, is not a self-heating and a self-reactive substance, is not an organic peroxide; and hence no classification according to both Directive 67/548/EEC and GHS (Regulation EC 1272/2008) is required.