Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Oxidising properties

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

non oxidising properties

Key value for chemical safety assessment

Oxidising properties:

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 for Acid Red 423 was calculated and resulted equal to - 92.32 which is greater than -200. Acid Red 423 decomposes at 300°C without any other thermic effect and a study performed on similar substance shows no oxidizing potential.

There are also evidences connected to the long experience in handling of the molecule that confirm that no explosive properties have never been observed and reported up to now in the usual conditions of production, stock, transport and use. Furthermore, this substance is produced and used at the highest level in Europe, transported in ship from outside Europe at various temperature and stoking conditions. 

Justification for classification or non-classification

Classification for oxidising properties is not warranted under CLP Regulation (EC n. 1272/2008).