1-[(4-chlorophenyl)methyl]-1-cyclopentyl-3-phenylurea

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2008-08-07 to 2008-11-07

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:

yes (incl. QA statement)

Contact with:

powdered cellulose

Duration of test (contact time):

>= 72 - <= 85 s

Key result

Sample tested:

other: barium nitrate/cellulose 2:1

Parameter:

preliminary test

Remarks on result:

mixture does not ignite and burn

Preliminary testThree test mixtures with the test item and cellulose 2:1 burned for 181, 197 and 197 s, respectively.The test item burned with a sooting flame.Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 72 s, 80 s and 85 s.Due to the results of the preliminary test the full test had to be performed.Five tests were performed for the reference mixture (barium nitrate and cellulose) with 40, 50, 55, 60and 70 wt.% oxidizer (barium nitrate). The results are shown in the following table.

Barium nitrate [wt.%]	Burning time over 200 mm [s]	Burning rate [mm/s]
40	300	0.67
50	209	0.96
55	207	0.97
60	241	0.83
70	380	0.53

The highest burning rate 0.97 mm/s was found for the mixture with 55 wt.% oxidizer.

Main test

Mixtures of the test item with cellulose were prepared in 10 %-increments between 10 and 90 wt.% test item and tested.The following table shows the results.

The following table shows the results.

Test item [^0/0]	Burning time over 200 mm [s]	Burning rate [mm/s]
10	194	1.03
20	150	1.33
30	166	1.20
40	167	1.20
50	187	1.07
60	164	1.22
70	226	0.88
80	993	0.20
90	The test item could not be ignited with a flame, the test item melted.
100	The test item could not be ignited with a flame, the test item melted.

Due to the fact that the maximum burning rate of the mixture of the test item and cellulose was faster than the maximum burning rate of the reference mixture of cellulose and barium nitrate no repetitions of the tests for the test item were performed.

Additional Main Tests

Additional experiments of test item (20, 50 and 60 wt.%) and of barium nitrate (55 wt.%) with kieselguhr, as well as in an inert atmosphere (Argon) with a glowing coil as ignition source (50 and 60 wt.% test item; 55 vft.⁰/0 barium nitrate), were performed to exclude a false positive result.

Main Test with Kieselquhr

The following table shows the results of mixtures with kieselguhr.

Test item [^0/0]	Burning time over 200 mm [s]	Burning rate [mm/s]
20	no ignition
50	117	1.71
60	107	1.87
Barium nitrate [^0/0]	Burning time over 200 mm [s]	Burning rate [mm/s]
55	no ignition

The mixture of test item (50 and 60 ⁰/0) with Kieselguhr showed a propagating combustion. Due to the fact that Kieselguhr is an inert substance and does not burn it has to be concluded from this test, that the melted test item sustained the combustion if soaked in a porous material. In mixture with Kieselguhr the melted test item was soaked in the porous Kieselguhr and let to an increase of the free surface, which sustained the combustion.

From this test it can be concluded that also in mixture with cellulose the melted test item was soaked in the porous structure of the cellulose and sustained the combustion. The higher burning rate of the mixtures of test item with cellulose compared to the reference mixtures of barium nitrate with cellulose was not caused by oxidizing properties of the test item but by the combustibility of the melted test item in the porous materials cellulose or Kieselguhr.

Due to the burning behaviour of the mixture of test item with Kieselguhr, it is concluded, that the test item has no oxidizing properties.

Main Test under Argon Atmosphere

Mixtures of the test item with cellulose were prepared using 50 and 60 wt.% of the test item. A mixture of barium nitrate with cellulose was prepared using 55 wt.% of barium nitrate. The mixtures were tested under argon atmosphere.

The following table shows the results of mixtures in an inert atmosphere.

Test item [^0/0]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	no ignition, significant development of smoke
60	no ignition, significant development of smoke
Barium nitrate [^0/0]	Burning time over 200 mm [s]	Burning rate [mm/s]
55	414	0.48

Due to the results of the experiments in an inert atmosphere, it can be stated that the test item has no oxidizing properties. This result is confirmed by the chemical structure of the test item, which has no critical molecular groups concerning oxidizing properties.

 

Interpretation of results:

GHS criteria not met

Conclusions:

The test item has no oxidizing properties in the sense of the consolidated version of Guideline67/548/EEC Annex V, Method A. 17 (Council Directive 92/69/EEC).

Key value for chemical safety assessment

Oxidising properties:

non oxidising