2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3,8-bis[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, trisodium salt

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising 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 incapable of reacting exothermically with combustible materials

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
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;
 
where:
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 (less -500); 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 --84.52. It needs to be considered thatthe 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. No chemical alert in the structure.

Reason / purpose for cross-reference:

reference to other study

GLP compliance:

not specified

Key result

Remarks on result:

other: non oxidizing

Interpretation of results:

GHS criteria not met

Conclusions:

The substance Blendazol Red is considered to be non-oxidizing and is not capable of causing fire or enhancing the risk of fire when in contact with combustible material. No incompatible substances have been identified with the substance. The substance is stable at room temperature and does not evolve any flammable gases in contact with water or humid air. The substance is not considered to be an explosive as it is not thermally sensitive, not shock sensitive and not sensitive to friction. Conditions have not been identified which would contribute to the instability of the substance; the substance is considered to be stable under normal conditions of use.

Executive summary:

In accordance with Column 2 of REACH Annex VII, this study does not need to be conducted as this substance is incapable of reacting exothermically with combustible materials on the basis of its chemical structure.

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;

 

where:

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 (less -500); 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 --84.52. It needs to be considered that 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 adaptation as 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. No chemical alert in the structure.

Data from several other vinyl sulphone dyes with very similar structure did not show oxidizing properties.

Justification for classification or non-classification

In accordance with Column 2 of REACH Annex VII, this study does not need to be conducted as this substance is incapable of reacting exothermically with combustible materials on the basis of its chemical structure.