Niobium hydride

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

pyrophoric solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11 June 2018 to 13 June 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.13 (Pyrophoric Properties of Solids and Liquids)

Version / remarks:

2016

Deviations:

no

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.2 (Test method for pyrophoric solids)

Version / remarks:

2015

Deviations:

no

GLP compliance:

yes

Key result

Test procedure:

ignition time on contact with air

Temp.:

20 °C

Remarks on result:

no ignition within 5 minutes

The full test was performed to monitor the pyrophoric properties of the test material. In none of the tests, spontaneous ignition of the test material occurred during dropping or within five minutes of settling.

In conclusion, the test material has no pyrophoric properties.

Interpretation of results:

other: Not classified according to EU criteria

Conclusions:

Under the conditions of the study, the test material has no pyrophoric properties.

Executive summary:

The pyrophoric properties of the test material were assessed according to EC Guideline A.13 and UN Test N.2, and under GLP conditions.

For practical reasons, the test material was ground with a mortar prior to the test. The quantity of test material required to obtain one to two mL of the test material was determined. A measuring cylinder was filled with 2 mL of the test material and weighed. The quantity of the 2 mL test material was 6.27 g.

Approximately 1 cm³ of the test material was poured from about 1 meter height onto a non-combustible solid surface. It was observed whether the test material ignited during dropping or within five minutes of settling.

The test was performed six times and at 20.0°C.

In none of the tests, spontaneous ignition of the test material occurred during dropping or within five minutes of settling.

Under the conditions of the test, the test material has no pyrophoric properties.

Reference 2

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11 June 2018 to 13 June 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.12 (Flammability (Contact with Water))

Version / remarks:

2016

Deviations:

no

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.5 (Test method for substances which in contact with water emit flammable gases)

Version / remarks:

2015

Deviations:

no

GLP compliance:

yes

Key result

Test procedure:

step 1

step 2

step 3

step 4

Remarks on result:

no reaction with water observed

The full test was performed to monitor the reactivity of the test material in contact with water.

No evolution of a gas and/or spontaneous ignition of the test material in contact with water was observed in Test 1, Test 2, Test 3 and Test 4.

In conclusion, the test material is ‘not highly flammable’ in contact with water.

Interpretation of results:

other: Not classified according to EU criteria

Conclusions:

Under the conditions of the study the test material is ‘not highly flammable’ in contact with water.

Executive summary:

The flammability of the test material on contact with water was assessed according to EC Guideline A.12 and UN Test N.5 and under GLP conditions.

For practical reasons, the test material was ground with a mortar prior to the test. The test material was tested according to the procedures given below. The tests were performed at 20°C ± 5°C and at atmospheric pressure.

Test 1: A small quantity of the test material of approximately 2 mm diameter was placed in a trough of double distilled water. Observations were made whether any gas was evolved and/or if spontaneous ignition of the gas had occurred.

Test 2: A small quantity of the test material of approximately 2 mm diameter was placed onto the centre of a 589/1 filter-paper which was floated flat on the surface of double distilled water. Observations were made whether any gas was evolved and/or if spontaneous ignition of the gas.

Test 3: The test material was made into a pile of approximately 2 cm high and 3 cm diameter with a hole in the top. A few drops of double distilled water were added to the hole. Observations were made whether any gas was evolved and/or if spontaneous ignition of the gas had occurred.

Test 4: An aliquot of 10 g test material was weighed into an erlenmeyer flask. A volume of 20 mL double distilled water was added dropwise to the erlenmeyer flask from a dropping funnel. Any evolving gas was trapped in a graduated cylinder filled with water and placed upside down in a beaker. The gas formation was monitored as a function of time.

The rate of gas formation was determined over a period of 7 hours at a 1 hour interval. If any gas evolved it was tested for flammability.

Test 4 was performed in triplicate.

No evolution of a gas and/or spontaneous ignition of the test material in contact with water was observed in Test 1, Test 2, Test 3 and Test 4.

In conclusion, the test material is ‘not highly flammable’ in contact with water.

Reference 3

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 October 2018 to 10 January 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.1 (Test method for readily combustible solids)

Version / remarks:

2015

Deviations:

no

GLP compliance:

yes

Key result

Test procedure:

burning rate test: preliminary screening test

Remarks on result:

substance does not ignite and propagate combustion either by burning with flame or smouldering along 200 mm of the powder train within the 2 minutes test period

In contact with the flame of the gas burner the test material glowed, emitted orange sparks and turned into a matt grey residue. No smoke was observed. After removal of the ignition source, no propagation of combustion of the test material was observed.

Interpretation of results:

other: Not classified according to EU criteria

Conclusions:

Under the conditions of the study the test material is considered ‘not flammable’.

Executive summary:

The flammability of the test material was assessed according to UN Manual of Tests and Criteria Test N.1 in compliance with GLP.

The preliminary screening test was performed for the determination of the flammability of the test material. The test material was ground down using a mortar and pestle.

The ground test material was loosely filled into an aluminium mould of 250 mm long with a triangular cross-section of inner height of 10 mm and width of 20 mm. On both sides of the mould in a longitudinal direction, two metal plates were mounted as lateral limitations that project 2 mm beyond the upper edge of the triangular cross section. The mould was dropped three times from a height of 2 cm onto a solid surface. If necessary, the mould was filled up again. The lateral limitations were removed and the excess substance was scraped off. A non-combustible and non-porous plate was placed on top of the mould. The complete assembly was inverted and the mould removed.

A flame of a gas burner was applied to one end of the test material pile for 5 minutes. The pile was visually interpreted for propagation of combustion either by burning with a flame or smouldering after 2 and after 5 minutes. The pile was visually interpreted for propagation of combustion either by burning with a flame or smouldering. 

In contact with the flame of the gas burner the test material glowed, emitted orange sparks and turned into a matt grey residue. No smoke was observed. After removal of the ignition source, no propagation of combustion of the test material was observed.

No propagation of combustion of the test item along 200 mm length of the pile within 2 minutes (and 5 minutes) was observed. According to the guidelines, performance of the burning rate test is not required. 

Based on the results obtained, the test material isconsidered ‘not flammable’.

Description of key information

Flammable solids

Under the conditions of the study the test material is considered ‘not flammable’.

 

Pyrophoric solids

Under the conditions of the study the test material has no pyrophoric properties.

 

Flammability in contact with water

Under the conditions of the study the test material is ‘not highly flammable’ in contact with water.

Key value for chemical safety assessment

Flammability:

not classified

Additional information

Flammable solids

The flammability of the test material was assessed according to UN Manual of Tests and Criteria Test N.1 in compliance with GLP. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The preliminary screening test was performed for the determination of the flammability of the test material. The test material was ground down using a mortar and pestle.

The ground test material was loosely filled into an aluminium mould of 250 mm long with a triangular cross-section of inner height of 10 mm and width of 20 mm. On both sides of the mould in a longitudinal direction, two metal plates were mounted as lateral limitations that project 2 mm beyond the upper edge of the triangular cross section. The mould was dropped three times from a height of 2 cm onto a solid surface. If necessary, the mould was filled up again. The lateral limitations were removed and the excess substance was scraped off. A non-combustible and non-porous plate was placed on top of the mould. The complete assembly was inverted and the mould removed.

A flame of a gas burner was applied to one end of the test material pile for 5 minutes. The pile was visually interpreted for propagation of combustion either by burning with a flame or smouldering after 2 and after 5 minutes. The pile was visually interpreted for propagation of combustion either by burning with a flame or smouldering. 

In contact with the flame of the gas burner the test material glowed, emitted orange sparks and turned into a matt grey residue. No smoke was observed. After removal of the ignition source, no propagation of combustion of the test material was observed.

No propagation of combustion of the test item along 200 mm length of the pile within 2 minutes (and 5 minutes) was observed. According to the guidelines, performance of the burning rate test is not required. 

Based on the results obtained, the test material is considered ‘not flammable’.

 

Pyrophoric solids

The pyrophoric properties of the test material were assessed according to EC Guideline A.13 and UN Test N.2, and under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

For practical reasons, the test material was ground with a mortar prior to the test. The quantity of test material required to obtain one to two mL of the test material was determined. A measuring cylinder was filled with 2 mL of the test material and weighed. The quantity of the 2 mL test material was 6.27 g.

Approximately 1 cm³ of the test material was poured from about 1 meter height onto a non-combustible solid surface. It was observed whether the test material ignited during dropping or within five minutes of settling.

The test was performed six times and at 20.0°C.

In none of tests, spontaneous ignition of the test material occurred during dropping or within five minutes of settling.

Under the conditions of the test, the test material has no pyrophoric properties.

 

Flammability in contact with water

The flammability of the test material on contact with water was assessed according to EC Guideline A.12 and UN Test N.5, and under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

For practical reasons, the test material was ground with a mortar prior to the test. The test material was tested according to the procedures given below. The tests were performed at 20°C ± 5°C and at atmospheric pressure.

Test 1: A small quantity of the test material of approximately 2 mm diameter was placed in a trough of double distilled water. Observations were made whether any gas was evolved and/or if spontaneous ignition of the gas had occurred.

Test 2: A small quantity of the test material of approximately 2 mm diameter was placed onto the centre of a 589/1 filter-paper which was floated flat on the surface of double distilled water. Observations were made whether any gas was evolved and/or if spontaneous ignition of the gas.

Test 3: The test material was made into a pile of approximately 2 cm high and 3 cm diameter with a hole in the top. A few drops of double distilled water were added to the hole. Observations were made whether any gas was evolved and/or if spontaneous ignition of the gas had occurred.

Test 4: An aliquot of 10 g test material was weighed into an erlenmeyer flask. A volume of 20 mL double distilled water was added dropwise to the erlenmeyer flask from a dropping funnel. Any evolving gas was trapped in a graduated cylinder filled with water and placed upside down in a beaker. The gas formation was monitored as a function of time.

The rate of gas formation was determined over a period of 7 hours at a 1 hour interval. If any gas evolved it was tested for flammability.

Test 4 was performed in triplicate.

No evolution of a gas and/or spontaneous ignition of the test material in contact with water was observed in Test 1, Test 2, Test 3 and Test 4.

In conclusion, the test material is ‘not highly flammable’ in contact with water.

Justification for classification or non-classification

In accordance with the criteria for classification as defined in Annex I, Regulation (EC) No 1272/2008, the substance does not require classification with respect to flammability.