Niobium doped titanium dioxide

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-11-01 to 2018-11-07

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Deviations:

no

GLP compliance:

no

Contact with:

powdered cellulose

Key result

Sample tested:

test mixture as specified

Parameter:

burning rate

Result:

0.38 mm/s

Remarks on result:

other: The mixture did not burn for the complete distance, therefore the determined burning rate is not valid.

Preliminary test

Three test mixtures with the test item and cellulose 2:1 showed only slow smoldering.

Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 63 s, 63 s and 61 s, respectively.

Due to the results of the preliminary test the main test had to be performed.

 

Main test

Four tests were performed for the reference mixture (barium nitrate and cellulose) with 50, 55, 60 and

70 wt% oxidiser (barium nitrate). The results are shown in Table 1.

 

Table 1: Burning times and rates of reference mixtures

Barium nitrate / wt%	Burning time over 200 mm / s	Burning rate / mm/s
50	147	1.36
55	141	1.42
60	141	1.42
70	178	1.12

 

The highest burning rate of 1.42 mmls was found for the mixtures with 55 wt% and 60 wt% oxidiser.

Mixtures of the test item with cellulose were prepared in between 10 and 90 wt% of the test item and tested. Table 2 shows the results.

 

Table 2: Burning times and rates of test item mixtures

Test item / wt%	Burning time over 200 mm / s	Burning rate / mm/s
10	The mixture extinguished after 148 mm and 388 seconds	(0.38)
20	The mixture extinguished in the preliminary burning phase
30	The mixture extinguished in the preliminary burning phase
60	The mixture extinguished in the preliminary burning phase
90	The mixture could not be ignited

 

 

Due to the fact that the maximum burning rate of the mixtures of the test item with cellulose is lower than the maximum burning rate of the reference mixture, the three mixtures with the most vigorous effect were only repeated twice to verify these values (see Table 3).

 

Table 3: Burning times and rates of the fastest test item mixtures

Test item / wt%	t / s	V /mm/s	t / s	V /mm/s	t / s	V /mm/s
10	388 (148 mm)	(0.38)	542 (172 mm)	(0.32)	176 (63 mm)	(0.36)
20	The mixture extinguished in the preliminary burning phase
30	The mixture extinguished in the preliminary burning phase

 

Each mixture was measured 3 times. None of the mixture burned for the complete distance and therefore no burning rate in the sense of this test could be determined.

The maximum burning behavior of the mixtures of the test item and cellulose was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.42 mm/s).

Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item has no oxidizing properties.

Interpretation of results:

GHS criteria not met

Conclusions:

All investigated sample-to-cellulose samples did not burn for the complete distance. Therefore no burning rate could be determined. Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item has no oxidising properties.

Executive summary:

A test was conducted according to European Commission Regulation (EC) No. 440/2008, Method 4.17, to determine the oxidizing properties of the solid test item. The reference sample Barium nitrate showed burning rates between 1.12 to 1.42 mm/s. All investigated sample-to-cellulose samples did not burn for the complete distance. Therefore no burning rate could be determined. Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item has no oxidising properties.

Description of key information

The test item has not to be classified as oxidising solid, oxidising liquid or oxidising gas (reference 4.15-1-3).

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

Oxidising solids (reference 4.15-1)

A test was conducted according to European Commission Regulation (EC) No. 440/2008, Method 4.17, to determine the oxidizing properties of the solid test item. The reference sample Barium nitrate showed burning rates between 1.12 to 1.42 mm/s. All investigated sample-to-cellulose samples did not burn for the complete distance. Therefore no burning rate could be determined. Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item has no oxidising properties.

Oxidising gases (reference 4.15-2)

The test item is a solid at ambient conditions. This hazard class is only applicable for gases. Thus, the substance was not considered for classification as oxidising gases.

 

Oxidising liquids (reference 4.15-3)

The test item is a solid at ambient conditions. This hazard class is only applicable for gases. Thus, the substance was not considered for classification as oxidising liquids.

Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No 1272/2008

The available experimental test data are reliable and suitable for classification purposes under Regulation (EC) No 1272/2008. Based on available data the test item is not classified and labelled as oxidizing solid according to Regulation (EC) No 1272/2008 (CLP), as amended for the twelfth time in Regulation (EU) 2019/521.

In accordance with Annex I, Section 2.4, Section 2.13 and Section 2.14 of Regulation (EC) No 1272/2008 and UN GHS Rev 8 (2019) the substance has not to be classified as oxidising gas or oxidising liquid.