tungsten zirconium oxide

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

19 - 20 September 2017

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.3 (Gravimetric test for oxidizing solids)

Version / remarks:

Sixth revised edition (2015)

Deviations:

yes

Remarks:

see 'Principles of method if other than guideline'

Principles of method if other than guideline:

The reference item purity is 79.1% in CaO2 instead of 75% ± 0.5% as described in the method.
For reference item / cellulose mixture 1:2, the relative standard deviation was higher than 10%.
Considering that no burning of the mixtures of the test item / cellulose was observed, these deviations were not considered to have affected the quality or the interpretation of the results obtained.

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Key result

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

burning rate

Remarks on result:

mixture does not ignite and burn

Key result

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

burning rate

Remarks on result:

mixture does not ignite and burn

Sample tested:

reference: 1:2 mixture calcium peroxide + cellulose

Parameter:

burning rate

Result:

0.254 g/s

Remarks on result:

other: Mean of 5 assays

Remarks:

The mixture ignited and combustion was observed.

No reaction with the test item / cellulose mixture in proportions 4:1 or 1:1 was observed.

If the test item, in both the 4:1 and 1:1 sample-to-cellulose ratio (by mass) tested, does not ignite and burn, or exhibits mean burning rates less than that of a 1:2 mixture (by mass) of calcium peroxide and cellulose, it is not assigned to Division 5.1 and not classified as an oxidising solid under the CLP regulation (EC) No. 1272/2008 in GHS terminology.

Interpretation of results:

GHS criteria not met

Conclusions:

The oxidising properties of tungsten zirconium hydroxide oxide (CAS No. 1037842-83-3) were investigated according to the UN O.3 test method in compliance with GLP. No reaction with the test item / cellulose mixture in proportions 4:1 or 1:1 was observed.
Therefore, the test item was not considered as an oxidising solid following GHS terminology and was not classified in Division 5.1 and thus was not assigned to any packing group following the “UN Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria”.

Description of key information

In a key study (Klimisch 1, Demangel, 2018), the oxidising properties of tungsten zirconium hydroxide oxide were investigated according to the UN O.3 test method in compliance with GLP. The test item was not considered as an oxidising solid following GHS terminology and was not classified in Division 5.1 and thus was not assigned to any packing group following the “UN Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria”.

Key value for chemical safety assessment

Oxidising properties:

non oxidising