Reaction mass of trizirconium monoxide and zirconium dioxide

Explosiveness

Administrative data

Endpoint:

explosiveness, other

Type of information:

experimental study

Adequacy of study:

key study

Study period:

28/03/2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Part I: Classification procedures, test methods and criteria relating to explosives of Class 1

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: OECD test guideline 113 (1981): Thermal Stability

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Trizirconium monoxide

Molecular formula:

Zr3O

IUPAC Name:

Trizirconium monoxide

Constituent 2

Reference substance name:

Zirconium dioxide

EC Number:

215-227-2

EC Name:

Zirconium dioxide

Cas Number:

1314-23-4

Molecular formula:

O2Zr

IUPAC Name:

Zirconium dioxide

impurity 1

Reference substance name:

Hafnium

EC Number:

231-166-4

EC Name:

Hafnium

Cas Number:

7440-58-6

Molecular formula:

Hf

IUPAC Name:

Hafnium

Test material form:

solid: bulk

Specific details on test material used for the study:

Batch No.: C000344287
Appearance: Dark grey powder

Results and discussion

Small-scale preliminary tests

Key result

Parameter:

other: DSC-measurement up to 500°C in a closed glass crucible under nitrogen

Value:

30

Remarks on result:

not thermal sensitive if heated under defined confinement

Remarks:

In the DSC-measurement the energy of the exothermic decomposition of the test item ZrO was below the threshold of 500 J/g (absolute value of the exothermic energy).

Any other information on results incl. tables

In the temperature range of 310 – 350 °C a small exothermic effect can be observed, with an average decomposition energy of 30 J/g.

Due to the decomposition energy being below the threshold of 500 J/g (absolute value of the exothermic energy), further tests for explosive properties did not have to be performed.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

According to the results of the test on thermal stability, the test item is classified as following:
UN Transport Regulation: The test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation.
GHS (CLP Regulation EC 1272/2008: Annex 1: 2.1): The test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.
Regulation EC No. 440/2008 and Directive 67/548/EEC:The test item has no explosive properties according to the Regulation EC No. 440/2008 Method A.14. Explosive Properties.

Executive summary:

In the DSC-measurement the energy of the exothermic decomposition of the test item ZrO was < 500 J/g (absolute value of the exothermic energy). Therefore, further tests for explosive properties had not to be performed.

According to the results of the test on thermal stability, the test item is classified as following:

UN Transport Regulation: The test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation.

GHS (CLP Regulation EC 1272/2008: Annex 1: 2.1): The test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.

Regulation EC No. 440/2008 and Directive 67/548/EEC:The test item has no explosive properties according to the Regulation EC No. 440/2008 Method A.14. Explosive Properties.