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Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15 Dec - 21 Dec 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Version / remarks:
adopted in 2008
Deviations:
no
GLP compliance:
no
Test material information:
Composition 1
Specific details on test material used for the study:
Storage conditions: ambient temperature (10 to 30 °C)
Contact with:
powdered cellulose
Sample tested:
test mixture as specified
Remarks:
test item/ cellulose 2:1
Parameter:
preliminary test
Remarks on result:
mixture does not ignite and burn
Remarks:
Tested 3 times
Sample tested:
test mixture as specified
Remarks:
barium nitrate/cellulose 2:1
Parameter:
preliminary test
Remarks on result:
other: 3 test mixtures burned down completely in 60, 57, 56 s
Sample tested:
reference mixture as specified
Remarks:
barium nitrate and cellulose with different wt. % oxidizer
Parameter:
maximum burning rate
Result:
1.8 mm/s
Remarks on result:
other:
Remarks:
result found for mixture with 60 wt. % oxidizer
Sample tested:
test mixture as specified
Remarks:
cellulose with 10 wt% test item
Parameter:
burning time of reaction over a distance of 200 mm
Remarks on result:
other: flame extinguished in pre-burning phase
Sample tested:
test mixture as specified
Remarks:
cellulose with 20, 30, 60, 90 wt% test item
Parameter:
burning time of reaction over a distance of 200 mm
Remarks on result:
other: no ignition, only charring in are of ignition source

Results
Preliminary Test
Three test mixtures with the test item and cellulose 2:1 could not be ignited. A charring in the area of the ignition source was observed. Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 60 s, 57 s and 56 s, respectively.

Main Test
Four tests were performed for the reference mixture (barium nitrate and cellulose) with different wt. % oxidizer (barium nitrate), see Table 1.

Table 1 – Burning times and rates of reference mixtures

Barium nitrate [wt. %]

Burning time over 200 mm [s]

Burning rate [mm/s]

50

130

1.54

55

127

1.57

60

111

1.80

70

168

1.19

 

The highest burning rate of 1.80 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 (Table 2).

Table 2 - Burning times and rates of test item mixtures

Test item [%]

Burning time over 200 mm [s]

Burning rate [mm/s]

10

Flame extinguished in the pre-burning phase

---

20

No ignition, only a charring in the area of the ignition source

30

60

90

 

Because all mixtures of the test item with cellulose could not be ignited, two tests were performed with the mixtures with 10, 20 and 30 wt. % of the test item to verify these results (Table 3).

Table 3 – Burning times and rates of fastest test item mixtures

test

t [s]

v [mm/s]

t [s]

v [mm/s]

t [s]

v [mm/s]

10 %

Flame extinguished in the pre-burning phase

20 %

No ignition, only a charring in the area of the ignition source

30 %

 

Due to the fact that the mixture of the test item with cellulose burned slower (no ignition) compared to the reference mixture, it was concluded that the test item has no oxidizing properties.

Description of key information

Non oxidizing solid (EU Method A.17.)

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

The maximum burning rate of test item and cellulose mixture was slower (no ignition) than that of the reference mixture of barium nitrate and cellulose 2:1 (1.80 mm/s).

Justification for classification or non-classification

The available data on oxidizing properties of the test substance do not meet the criteria for classification according to Regulation (EC) 1272/2008 or Directive 67/548/EEC, and are therefore conclusive but not sufficient for classification: The maximum burning rate of the test mixture was less than that of the reference mixture (barium nitrate and cellulose 2:1) in a test according to the EU method A.17.