Niobium oxide

Flammability

Link to relevant study record(s)

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-12-15

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Deviations:

no

GLP compliance:

no

Key result

Test procedure:

burning rate test: preliminary screening test

Burning time:

340 s

Remarks on result:

other: Ignition occurred and combustion propagated along 200 mm of the powder train within 340 s.

Results of the preliminary screening test

The test substance was formed into a powder train about 250 mm long by 20 mm wide by 10 mm high on a fireclay plate. A hot flame from a gas burner was applied to one end of the powder train. Ignition occurred and combustion propagated along 200 mm of the powder train within 340 s.

Burning rate test

Since combustion propagated along 200 mm in more than 45 s the test substance has not to be considered as highly flammable and no further testing was required.

Result

The test substance Niobium (II) oxide (NbO) is not highly flammable.

Interpretation of results:

not classified based on GHS criteria

Conclusions:

In conclusion, in a preliminary screening test, ignition of the test substance Niobium(II) oxide occurred and combustion propagated along 200 mm of the powder train within 340 s. According to the guideline, performance of a main study for the determination of the burning rate of the test substance was not required. Therefore, Niobium(II) oxide is considered as not highly flammable.

Executive summary:

The flammability of Niobium(II) oxide (>99.5 % purity) was tested according to Regulation 440/2008/EC Method A.10. In a preliminary screening test, the test substance was formed into a powder train about 250 mm long, 20 mm wide and 10 mm high. When a hot flame was applied, ignition occurred and combustion propagated along 200 mm within 340 s.

According to the guideline, performance of a main study for the determination of the burning rate of the test substance was not required. Based on the results obtained, the test substance is considered as not highly flammable.

Description of key information

The flammability of Niobium(II) oxide (>99.5 % purity) was tested according to Regulation 440/2008/EC Method A.10. In a preliminary screening test, the test substance was formed into a powder train about 250 mm long, 20 mm wide and 10 mm high. When a hot flame was applied, ignition occurred and combustion propagated along 200 mm within 340 s.

According to the guideline, performance of a main study for the determination of the burning rate of the test substance was not required. Based on the results obtained, the test substance is considered as not highly flammable.

Key value for chemical safety assessment

Flammability:

not classified

Justification for classification or non-classification

Since the combustion time of the test substance exceeds 45 seconds, Niobium(II) oxide is not classified as flammable solid in accordance with UN GHS Rev. 6 criteria.