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Oxidising properties

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Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2014-11-26 until 2014-11-28
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.1 (Test for oxidizing solids)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Contact with:
powdered cellulose
Duration of test (contact time):
180 s
Sample tested:
reference: 3:7 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
101 s
Remarks on result:
other: not reported
Key result
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
> 180 s
Remarks on result:
mixture does not ignite and burn
Remarks:
slight blackening was observed directly around the ignition wire
Key result
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
> 180 s
Remarks on result:
mixture does not ignite and burn
Remarks:
slight blackening was observed directly around the ignition wire

Test sample results:

 Mix ratio (w/w) burning times               total (s) mean (s) 
  1st 2nd  3rd  4th  5th     
 1:1 (test material 15 g / cellulose 15 g) >180 >180  >180  >180  >180  >900  >180 
 4:1 (test material 24 g / cellulose 6 g) >180  >180  >180  >180  >180  >900  >180 

Table with reference sample results

 Mix ratio (w/w) burning times (s)             total (s)  mean (s) 
  1st 2nd  3rd  4th  5th     
 3:7 (potassium bromate 9 g / cellulose 21 g) 102  99  97  104  103  505  101 

Note: As the Test Material/Cellulose mixtures possessed reaction times greater than the 3:7 potassium bromate/cellulose mixture, the test material was concluded to be not oxidizing. The 2:3 Potassium Bromate/Cellulose and 3:2 Potassium Bromate/Cellulose mixtures did not require testing as they normally allow ascribing the right hazard class/packing group when a substance is classified.

Interpretation of results:
GHS criteria not met
Conclusions:
A test performed according to the UN O.1 test guideline demonstrated that zirconium dinitrate oxide should not be classified as a material of Class 5.1.

Description of key information

Zirconium dintrate oxide is concluded not to have oxidising properties based on the results of a test performed according to the UN O.1 test method (Younis, 2015c).

Key value for chemical safety assessment

Oxidising properties:
no

Additional information

In a GLP study in accordance with UN test method O.1, the test sample mixtures did not ignite and burn. Therefore, testing was terminated after 3 minutes in accordance with the test standard (Younis, 2015c) and it was concluded that zirconium dinitrate oxide has no oxidising properties. This study was considered as reliable (Klimisch 1) and as the key study for endpoint coverage.

Justification for classification or non-classification

It has been determined that zirconium dinitrate oxide should not be classified for oxidising properties under the CLP Regulation.