alkoxy substituted aryl diazo heterocyclic aryl nitrile

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

November 17, 2014 - November 25, 2014

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:

yes (incl. QA statement)

Contact with:

powdered cellulose

Sample tested:

reference mixture as specified

Remarks:

barium nitrate as oxidiser and cellulose 60:40

Parameter:

maximum burning rate

Result:

1.53 mm/s

Sample tested:

test mixture as specified

Remarks:

40% test substance, 60% cellulose

Parameter:

maximum burning rate

Result:

1.75 mm/s

Key result

Sample tested:

test mixture as specified

Remarks:

40% test substance, 60% Kieselgur 50% test substance, 50% Kieselgur

Parameter:

maximum burning rate

Result:

0 mm/s

Remarks on result:

mixture does not ignite and burn

Key result

Sample tested:

inert atmosphere

Remarks:

A mixture of the test item with cellulose was prepared using 40 % of the test item; the mixture was tested under argon atmosphere

Parameter:

maximum burning rate

Result:

0 mm/s

Remarks on result:

mixture does not ignite and burn

The test item was dried by treating the sample at 50 °C ± 5 °C under vacuum until the weight was constant. Grounding and sieving was not necessary because approximately 93 % of the test item were <125 µm (see paticle size distrubution).

 

 Preliminary test

Three test mixtures with the test item and cellulose 2:1 burned down completely in 61 s, 76 s and 63 s, respectively.

Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 62 s, 61 s and 64 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. % oxidizer (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	153	1.31
55	141	1.42
60	131	1.53
70	184	1.09

 

The highest burning rate of 1.53 mm/s was found for the mixture with 60 wt. % oxidizer.

 

Mixtures of the test item with cellulose were prepared in 10 %-increments between 10 and 50 wt. % of the test item and tested. Table 2 shows the results.

Table 2: Burning times and rates of test item mixtures

Test item[%]	Burning time over 200 mm [s]	Burning rate [mm/s]
10	161	1.24
20	140	1.43
30	135	1.48
40	114	1.75
50	129	1.55

 

The maximum burning rate of the mixtures of the test item and cellulose (1.75 mm/s) was higher than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.52 mm/s) (Figure1). Therefore the additional tests with kieselguhr and under an inert atmosphere had to be performed.

 

Additional main tests

The mixture of test item and cellulose showed a burning rate above to the fastest mixture of barium nitrate and cellulose. Therefore the following additional experiments were performed in order to exclude oxidizing properties or verify the result of the main test:

 

Main test with kieselgur.

Table 3 shows the results of mixtures with kieselgur.

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

Test item[%]	Burning time over 200 mm [s]	Burning rate [mm/s]
40	The mixture could not be ignited	---
50	The mixture could not be ignited	---

 

The mixture of test item (40 and 50 %) with kieselgur showed no propagating combustion. Due to this result a further test under inert atmosphere was necessary.

 

Main test under Argon atmosphere

A mixture of the test item with cellulose was prepared using 40 % of the test item. A mixture of barium nitrate with cellulose was prepared using 60 wt.% of barium nitrate. The mixtures were tested under argon atmosphere. Table 4 shows the results of mixtures in an inert atmosphere.

Table 4: Burning times and rates of the test item under inert atmosphere (argon)

Test item[%]	Burning time over 200 mm [s]	Burning rate [mm/s]
40	The mixture could not be ignited	---
Barium nitrate [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
60	209	0.96

 

Due to the results of the experiments in an inert atmosphere, it can be stated that the test item had no oxidizing properties.

Interpretation of results:

GHS criteria not met

Conclusions:

The test substance has no oxidizing properties

Executive summary:

The test item had no oxidizing properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.17.

Description of key information

The oxidising properties of the test item were determined according to the European Commission Regulations (EC) No. 440/2008, A.17. Oxidizing properties of solids.

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

A mixture of the test item with cellulose was prepared using 40 % of the test item. A mixture of barium nitrate with cellulose was prepared using 60 wt.% of barium nitrate. The mixtures were tested under argon atmosphere.

 

Burning times and rates of the test item under inert atmosphere (argon)

Test item[%]	Burning time over 200 mm [s]	Burning rate [mm/s]
40	The mixture could not be ignited	---
Barium nitrate [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
60	209	0.96

 

Due to the results of the experiments in an inert atmosphere, it can be stated that the test item had no oxidizing properties.

Justification for classification or non-classification

The test item had no oxidizing properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.17.