[No public or meaningful name is available]

Oxidising properties

Link to relevant study record(s)

Reference

Reference 1

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 organic substance contains oxygen or halogen atoms which are chemically bonded only to carbon or hydrogen and hence, the classification procedure does not need to be applied

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
According to REACh Annex VII / column 2, the study does not need to be conducted if the substance is incapable of reacting exothermically with combustible materials, for example on the basis of the chemical structure.
According to Regulation (EC) N°1272/2008 (CLP) criteria (Annex I §2.13.4./2.14.4., or as listed in the ECHA endpoint specific guidance on information requirements (R.7a, v6.0, July 2017, §R.7.1.13)), the substance contains an oxygen atom, but this element is chemically bonded only to carbon (especially not bonded to nitrogen or other oxygen).
Then oxidising properties are unlikely, and the classification procedure shall not apply, no further testing is required.

Reference 2

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

27 February to 01 March 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method, and under GLP. The substance is adequately identified. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Deviations:

no

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Remarks:

11 April 2011

Specific details on test material used for the study:

- Appearance: White powder
- Storage conditions: The test item was stored in a closed vessel at room temperature away from light and humidity.
- Pre-treatment: The substance was dried in an exsiccator and sieved through a 125 µm sieve. The fraction which did not pass the sieve was ground in a mortar and sieved again until the whole aliquot had passed the sieve.

Contact with:

powdered cellulose

Duration of test (contact time):

> 150 s

Sample tested:

test mixture as specified

Remarks:

3:2 sample-to-cellulose ratio (60%)

Parameter:

maximum burning rate

Result:

3.54 mm/s

Remarks on result:

result suspected of being a false positive

Sample tested:

reference mixture as specified

Remarks:

reference: 1:1 mixture Barium nitrate + cellulose

Parameter:

maximum burning rate

Result:

2.54 mm/s

Key result

Sample tested:

test mixture as specified

Remarks:

3:2 sample-to-cellulose ratio (60%)

Parameter:

burning rate

Remarks on result:

mixture does not ignite and burn

Remarks:

under argon

Pre-Test

The mixture of test item/cellulose (2:1) burned with a yellow flame and formation of black smoke. No dangerous reactions could be observed. The mixture of Ba(NO₃)₂/cellulose (2:1) burned quick with a green flame under crackling and formation of sparks.

 

Main Study

Observations: All reference item mixtures showed clear signs of oxidising properties (crackling, sparkling) and burned with a green flame.

All test item mixtures showed no signs of oxidising properties and burned with a yellow flame.

 

Table 4.15/2: Burning Rates Reference Item

 

% Ba(NO3)2	BurningTime(s)	Burning Rate(mm/s)
50	78.87	2.54
60	100.91	1.98
70	111.09	1.80

 

 

Table 4.15/3: Burning Rate of Test Item Mixtures

 

% Test item	BurningTime(s)	Burning Rate(mm/s)
10	76.46	2.62
20	70.25	2.85
30	58.88	3.40
40	63.60	3.14
50	63.81	3.13
60	56.44	3.54
70	68.40	2.92
80	68.28	2.93
90	150.78	1.33

 

 

The mixture with 60 % test item shows the highest burning rate. All burning rates except for the mixture with 90 % test item surpassed the burning rate of the reference mixture with the highest burning rate.

The highest burning rate of the mixtures test item/cellulose was higher (3.54 mm/s) than the highest burning rate of the reference mixtures (2.54 mm/s).

During the verification test under argon, the mixture with 60 % test item didn't ignite at al all. Therefore, a determination of the burning rate was not possible, and the test item was classified to be not oxidising under test conditions.

 

Validity:

Because the test item mixture with the highest burning rate (determined under normal atmosphere) did not ignite under argon, a determination of the burning rate was not possible. Therefore, the study is considered as valid.

Discussion:

The test item mixtures burned in the pre-test and main test with a yellow flame, but showed no signs of oxidising like sparkling or cracks. All burning rates except for the mixture with 90 % test item surpassed the burning rate of the reference mixture with the highest burning rate. As the test item is combustible and contains no chemical groups associated with oxidizing properties, a false positive result was suspected and the mixture of test item/cellulose with the highest burning rate was tested once more under inert gas (argon). As this mixture didn't ignite at all in the absence of oxygen and no determination of a burning rate was possible the test item was classified not oxidising.

Interpretation of results:

study cannot be used for classification

Conclusions:

The substance is NOT classified as oxidising according to Directive 67/548/EEC (DSD) criteria, i.e. under the conditions of guideline EU A.17.
The test is inconclusive according to Regulation (EC) N°1272/2008 (CLP) criteria.

Executive summary:

The oxidising properties of the substance were tested under GLP, according to the EU A.17 guideline.

 

In the pre-test, a mixture of cellulose and test item was found to be flammable. The maximum burning rate of three mixtures of the reference item (Ba(NO₃)₂) with cellulose was determined. Likewise, the burning rates of nine mixtures of the test item with cellulose (in different proportions) were determined. The burning rate of the mixture with the highest burning rate was higher than the fastest mixture of the reference item. As a false positive result was suspected (the test item contains no chemical groups associated with oxidizing properties but is combustible) the test with the mixture, with the highest burning rate, was tested under inert gas (argon). This mixture did not ignite under these test conditions.

 

The test item is considered to be Not oxidising under test conditions.

Description of key information

Testing not required, based on chemical structure.

A 60% mixture with cellulose burns in air, but does not ignite under argon (experimental).

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

According to the screening procedure described in Regulation (EC) N°1272/2008 (CLP), the structure of the substance does not contain any bond associated with oxidising properties.

Therefore, no further testing is required.

Moreover, a supporting experimental study for the determination of oxidising properties is available, but the method (EU A17) was conducted according to previous Directive 67/548/EEC (DSD) classification criteria. So the conclusion cannot be extrapolated to CLP criteria, as the procedure differs. Nevertheless the negative result confirms the low oxidising potential of the substance.

Justification for classification or non-classification

The substance is NOT classified as an oxidising solid according to CLP, based on the structural formula, that fulfills the screening procedure criteria.