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Reference
Endpoint:
oxidising liquids
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
UN Manual of Tests and Criteria: Test O.2 (Test for oxidizing liquids)
Version / remarks:
2015
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Contact with:
powdered cellulose
Key result
Sample tested:
test mixture 1:1
Parameter:
mean pressure rise time
Remarks on result:
maximum pressure of 2070 kPa not reached
Key result
Sample tested:
reference mixture with 65% nitric acid + cellulose (1:1 ratio)
Parameter:
mean pressure rise time
Result:
>= 4.5 - <= 6.5 s
Remarks on result:
other: mean rise time of 5.4 s

Table 1: Oxidising properties - test results

Test number

Rise time (s)

Comments

Reference (1:1 mixture of 65% nitric acid and cellulose)

1:1 mixture of test substance and cellulose

1

4.5

-

Timed out (90 s) – max pressure = 1230 kPa

2

4.7

-

Timed out (90 s) – max pressure = 1965 kPa

3

5.6

-

Timed out (90 s) – max pressure = 1659 kPa

4

6.5

-

Timed out (90 s) – max pressure = 1370 kPa

5

5.6

-

Timed out (90 s) – max pressure = 1357 kPa

Mean

5.4

Not applicable

 

Interpretation of results:
GHS criteria not met
Conclusions:
The substance was found to be non-oxidising.
Executive summary:

The oxidising properties of the substance were studied under GLP in accordance with the UN Test O.2 for liquid substances. The test was conducted with a cylindrical steel vessel, the pressure of which can be monitored by a transducer mounted in a side-arm. One end of the vessel was closed with a firing plug fitted with two electrodes. An ignition system was attached to the electrodes, consisting of a length of 25 cm Ni/Cr wire wound in the shape of a 5 mm diameter coil. The test substance was mixed thoroughly with dried cellulose in a ratio of 1:1 by weight. This mixture was added in small portions to the test vessel around the ignition coil. The opposite end of the vessel was then closed with a bursting disc that has a bursting pressure of about 2200 kPa. A current of 10 A was then applied to the ignition source. The mixture was heated until the bursting disc ruptured or until at least 60 seconds had elapsed. The signal produced by the transducer was recorded throughout the test and used to produce a time-pressure profile. The time taken for the pressure to rise from 690 kPa to 2070 kPa was then calculated. Five tests were conducted to determine the mean pressure rise time. The material was classified by comparing the mean pressure rise time to that of a 1:1 reference mixture of 65% aqueous nitric acid with cellulose. In all tests with the test mixture, the reaction failed to produce a pressure greater than the upper threshold of 2070 kPa, in which case the rise time could not be determined. The substance is not classified as an oxidising liquid in accordance with the criteria of UN Test O.2.

Description of key information

No pressure rise to 2070 kPa in five tests (UN Test O.2, GLP)

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Justification for classification or non-classification

A mixture of test substance with dried cellulose (1:1 by weight) was tested under GLP in accordance with UN Test O.2 for liquid substances. In all tests with the test mixture, the reaction failed to produce a pressure greater than the upper threshold of 2070 kPa, in which case the rise time could not be determined. The substance is not classified as an oxidising liquid in accordance with the criteria of UN Test O.2.

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