Acetamide, N-(4-fluorophenyl)-2-hydroxy-N-(1-methylethyl)-

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Sample tested:

test mixture as specified

Remarks:

10%test item with cellulose

Parameter:

burning rate

Result:

1.09 mm/s

Sample tested:

test mixture as specified

Remarks:

20% test item with cellulose

Parameter:

burning rate

Result:

1.16 mm/s

Sample tested:

test mixture as specified

Remarks:

30 % test item with cellulose

Parameter:

burning rate

Result:

1.21 mm/s

Sample tested:

test mixture as specified

Remarks:

40% test item with cellulose

Parameter:

burning rate

Result:

1.16 mm/s

Sample tested:

test mixture as specified

Remarks:

50% test item with cellulose

Parameter:

burning rate

Result:

1.41 mm/s

Sample tested:

test mixture as specified

Remarks:

60% test item with cellulose

Parameter:

burning rate

Result:

1.43 mm/s

Sample tested:

test mixture as specified

Remarks:

70% test item with cellulose

Parameter:

burning rate

Result:

0.95 mm/s

Sample tested:

test mixture as specified

Remarks:

90% test item with cellulose

Parameter:

burning rate

Remarks on result:

other: The mixture did not burn, the mixture melted

Due to the fact that the maximum burning rate of the mixtures of the test item with cellulose is higher than the maximum burning rate of the reference mixture, six tests were performed only with the three mixtures (30, 50 and 60 wt.% of the test item) with the highest burning rates to verify these values. Each mixture was measured 6 times. The mean burning rate for the mixture with the highest burning rate (60%) was 1.41 mm/s. The difference between the mean burning rate and the maximum burning rate was <= 10 % for this mixture. The maximum burning rate of the mixtures of the test item and cellulose (1.44 mm/s) was higher than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.35 mm/s). Therefore the additional tests with kieselguhr and under an inert atmosphere had to be performed. The mixture of test item and cellulose showed a burning rate above 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 kieselguhr.

Test item [%]	Burning rate [mm/s]
50	2.06
60	1.24

The mixture of test item (50 and 60 %) with Kieselgur showed a propagating combustion. Additionally a further test under inert atmosphere was performed. Main test under Argon atmosphere A mixture of the test item with cellulose was prepared using 60 % 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 shows the results of mixtures in an inert atmosphere.

Test item [%]	Burning rate [mm/s]
60	The mixture could not be ignited
Barium nitrate [%]	Burning rate [mm/s]
60	1.03

Due to the results of the experiments with kieselguhr and 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 item had no oxidizing properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A. 17.

Executive summary:

The purpose of this study was the determination of the oxidizing properties of the test item according to: European Commission Regulation (EC) No. 440/2008, A 17. Oxidizing properties of solids.

Preliminary test

The dried test item is mixed with the dried cellulose in the proportions 2 of the test item to 1 of cellulose by weight and the mixture is formed into a small cone shaped pile of dimensions 3.5 cm (diameter of base) x 2.5 cm (height) by filling, without tamping, a cone-shaped glass. The pile is placed on a non-combustible and non-porous plate. As ignition source a flame is used to ignite the pile. The vigour and duration of the resultant reaction is observed and recorded.

The test result is compared with this of a mixture of barium nitrate/cellulose 2: 1.

The test item is to be considered as oxidizing if the reaction is vigorous. In this case no further testing is required. When this is not the case, the substance should then be subject to the main test.

Main test

Mixtures of oxidizer/cellulose are prepared from 10 to 90 wt.%. For borderline cases, intermediate oxidizer/cellulose-mixtures are used to obtain the maximum burning rate more precisely.

The pile is formed by means of a mould. The mould is made of metal, has a length of 250 mm and a triangular cross-section with an inner height of 1 O mm and an inner width of 20 mm. On both sides of the mould, in longitudinal direction, two metal sheets are mounted as lateral limitations which overlook 2 mm the upper edge of the triangular cross-section. This arrangement is loosely filled with mixture in a slight excess. After dropping the mould from a height of 2 cm on to a solid surface, the remaining excess test item is scraped off with an oblique positioned sheet.

Then the lateral limitations are removed and the remaining powder is smoothed. A noncombustible plate is then placed on the top of the mould, the apparatus is inverted and the mould removed.

The flame of a gas burner is used as ignition source. The time of reaction over 200 mm after the reaction zone has propagated an initial distance of 30 mm is measured.

First the test is performed with the reference substance. The test is then carried out at least once with each one of the range of mixtures of the test item with cellulose.

If the burning rate of a given mixture is found significantly greater than that of the reference mixture, the test can be stopped. Otherwise, the test has to be repeated five times more with the three mixtures having shown the highest burning rate.

In case of a positive result additional tests of the reference substance and of the test item in mixture with kieselguhr are performed as well as experiments under an inert atmosphere (Argon).

For safety reasons the maximum burning rate shall be considered to be the characteristic oxidizing property of the test item.

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

Description of key information

The purpose of this study was the determination of the oxidizing properties of the test item according to: European Commission Regulation (EC) No. 440/2008, A 17. Oxidizing properties of solids.

Preliminary test

The dried test item is mixed with the dried cellulose in the proportions 2 of the test item to 1 of cellulose by weight and the mixture is formed into a small cone shaped pile of dimensions 3.5 cm (diameter of base) x 2.5 cm (height) by filling, without tamping, a cone-shaped glass. The pile is placed on a non-combustible and non-porous plate. As ignition source a flame is used to ignite the pile. The vigour and duration of the resultant reaction is observed and recorded.

The test result is compared with this of a mixture of barium nitrate/cellulose 2: 1.

The test item is to be considered as oxidizing if the reaction is vigorous. In this case no further testing is required. When this is not the case, the substance should then be subject to the main test.

Main test

Mixtures of oxidizer/cellulose are prepared from 10 to 90 wt.%. For borderline cases, intermediate oxidizer/cellulose-mixtures are used to obtain the maximum burning rate more precisely.

The pile is formed by means of a mould. The mould is made of metal, has a length of 250 mm and a triangular cross-section with an inner height of 1 O mm and an inner width of 20 mm. On both sides of the mould, in longitudinal direction, two metal sheets are mounted as lateral limitations which overlook 2 mm the upper edge of the triangular cross-section. This arrangement is loosely filled with mixture in a slight excess. After dropping the mould from a height of 2 cm on to a solid surface, the remaining excess test item is scraped off with an oblique positioned sheet.

Then the lateral limitations are removed and the remaining powder is smoothed. A noncombustible plate is then placed on the top of the mould, the apparatus is inverted and the mould removed.

The flame of a gas burner is used as ignition source. The time of reaction over 200 mm after the reaction zone has propagated an initial distance of 30 mm is measured.

First the test is performed with the reference substance. The test is then carried out at least once with each one of the range of mixtures of the test item with cellulose.

If the burning rate of a given mixture is found significantly greater than that of the reference mixture, the test can be stopped. Otherwise, the test has to be repeated five times more with the three mixtures having shown the highest burning rate.

In case of a positive result additional tests of the reference substance and of the test item in mixture with kieselguhr are performed as well as experiments under an inert atmosphere (Argon).

For safety reasons the maximum burning rate shall be considered to be the characteristic oxidizing property of the test item.

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

Key value for chemical safety assessment

Oxidising properties:

non oxidising