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Oxidising properties

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Description of key information

property not expected

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Based on Annex VII, Column 2 of the REACH Regulation (EC n. 1907/2006), the study does not to be performed based on the absence of structural alerts.

An oxidising substance is one that, while in itself not necessarily combustible, may cause or contribute to the combustion of other material. Oxidising substances generally act by yielding oxygen; however, those that release active halogens can also act as oxidants.

For organic substances only, is commonly used and accepted a screening evaluation that take into account the degree to which a substance can be oxidized, related to the chemical structure: the Oxygen Balance (OB) calculation may be used as a further criterium, in combination with chemical structure evaluation, in order to predict whether a substance has the potential to be an oxidant. The oxygen balance is calculated from the empirical formula of a compound in percentage of oxygen required for complete conversion of carbon to carbon dioxide and hydrogen to water.

The oxygen balance is calculated using the formula:


Oxygen balance = - 1600 [2x + (y/2)-z]/molecular weight;



X = number of atoms of carbon

Y = number of atoms of hydrogen

Z = number of atoms of oxygen


A negative oxygen balance is an indication that substance contains less oxygen than is needed; therefore it is not expected that substance may, generally by yielding oxygen, cause, or contribute to the combustion of other materials.

Oxygen balance was calculated and resulted equal to - 118.

It needs to be considered that the substance contains only one azo bond as alert groups, as value near to the limit one and contains many hydroxyl group. As reported on the “Guidance on Information Requirements and Chemical Safety Assessment - Chapter R.7a: Endpoint specific guidance” the presence of hydroxyl-groups will strongly affect the oxygen balance towards higher values, whereas this group does not contribute to explosive properties.

Specific rules for adaptationas decribed in Annex VII, Column 2 of the REACH Regulation (EC n. 1907/2006)can be applied and the oxidising properties test does not need to be conducted.

Justification for classification or non-classification

According to the definition set out in the CLP Regulation (EC 1272/2008) oxidising solid means a solid substance or mixture which, while in itself is not necessarily combustible, may, generally by yielding oxygen, cause, or contribute to, the combustion of other material. A specific study has not been conducted on the substance but based on the chemical structure the substance is incapable of reacting exothermically with combustible materials, therefore no classification as oxidising is warranted.

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