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Physical & Chemical properties

Oxidising properties

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Endpoint:
oxidising gases
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is a solid
Endpoint:
oxidising liquids
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is a solid
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-07-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Deviations:
no
GLP compliance:
no
Contact with:
powdered cellulose
Sample tested:
test mixture as specified
Remarks:
test item and cellulose 2: 1
Parameter:
preliminary test
Result:
7 s
Key result
Sample tested:
test mixture as specified
Remarks:
10 % in cellulose
Parameter:
burning rate
Result:
0.36 mm/s
Sample tested:
test mixture as specified
Remarks:
20 % in cellulose
Parameter:
burning rate
Result:
0.55 mm/s

Preliminary test

Three test mixtures with the test item and cellulose 2: 1 burned locally in 7 s, 63 s and 32 s, respectively. Three test mixtures with barium nitrate/cellulose 2: 1 burned down completely in 45 s, 53 s and 48 s, respectively. Due to the results of the preliminary test the main test had to be performed.

 

Main test

Four tests were performed for the reference mixture (barium nitrate and cellulose) with 50, 55, 60 and 70 wt. % oxidizer (barium nitrate).

 

Burning times and rates of reference mixtures

Barium nitrate [wt.%]

Burning time over 200 mm [s]

Burning rate [mm/s]

50

180

1.11

55

166

1.21

60

149

1.34

70

174

1.15

 

The highest burning rate of 1.34 mm/s was found for the mixture with 60 wt. % oxidizer. Mixtures of the test item with cellulose were prepared in between 10 and 90 wt. % of the test item and tested.

 

Burning times and rates of test item mixtures

Test item [%]

Burning time over 200 mm [s]

Burning rate [mm/s]

10

541

0.37

20

365

0.55

30

396

0.51

40

The mixture extinguished after 63 mm and 216 s.

-

60

The mixture extinguished in the preliminary burning phase.

-

90

The mixture extinguished in the preliminary burning phase.

-

 

Due to the much weaker effect than the reference mixtures the three mixtures with the most vigorous effect were repeated only twice.

 

Burning times and rates of the fastest test item mixtures

 

Test:

t[s]

V[mm/s]

t[s]

V[mm/s]

t(s]

V[mm/s] J

10%

541

0.37

302

0.66

559

0.36

20%

365

0.55

422

0.47

248

0.81

30%

396

0.51

376

0.53

Mixture extinguished after 63 mm and 298s

 

Each mixture was measured 3 times. As the test item was a waxy solid it was not possible to form a homogeneous mixture with cellulose. Therefore the deviation of the burning rates to each other was significantly higher than usual. However as all test item mixtures were significantly slower than the reference mixtures this had no influence on the result. The maximum burning rate of the mixtures of the test item and cellulose (0.66 mm/s) was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.34 mm/s). Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item has no oxidizing properties.

 

 

Description of key information

The test item has no oxidising properties (reference 4.15-1).

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Oxidising gases

The test item is a solid at ambient conditions. This hazard class is only applicable for gases. Thus, the substance was not considered for classification as oxidising gas.

 

Oxidising liquid

The test item is a solid at ambient conditions. This hazard class is only applicable for liquids. Thus, the substance was not considered for classification as oxidising liquid.

 

Oxidising solid

In accordance with column 2 Annex VII section 7.13 Regulation (EC) No 1907/2006 (REACH), the test on oxidising properties was waived as the chemical structure of the test item does not contain any functional groups quoted in 'Manual of Tests and Criteria' (fifth revised edition, appendix 6, chapter 6) which may indicate oxidizing properties. The test item was thus considered not oxidising. No experimental determination was carried out.

Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No 1272/2008

Based on the chemical structure and taking into account the provisions laid down in Regulation (EC) No 1272/2008, as amended for the twelfth time in Regulation (EU) No 2019/521, the substance is not considered to be classified for oxidising properties.