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Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
June 21 - Agust 31, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Contact with:
powdered cellulose
Key result
Sample tested:
other: test substance/cellulose 1:9
Remarks:
under argon atmosphere
Parameter:
burning rate
Remarks on result:
not determinable
Remarks:
Under argon, the mixture with 10% test substance did not ignite.

2.2.4 Observations

All reference substance mixtures burned with a green flame and showed clear signs of oxidising properties (cracks, sparkling).

All test substance mixtures observations are presented in the following table:

Table 2.2.4-a: Observations of Test substance Mixtures

% Test Substance

Observations

10

Burned with yellow flame, no sparkling was observed

20

Like 10% but slight sooting flame was observed

30

Like 20% with stronger sooting flame

40

Like 30% with wider and strong sooting flame

50

Like 30% with wider and strong sooting flame

60

Like 30% with wider and strong sooting flame

70

Like 30% with wider and strong sooting flame

80

Like 30% with wider and strong sooting flame

90

Flame died after 196.19 s (corresponds to approx. 5.5 cm)

No signs of oxidizing properties were observed.

10 (under argon)

No ignition occurred.

2.2.5 Burning Rates Reference Substance

In the following table, the measured data of the reference substance are presented.

Table 2.2.5-a: Burning Rate of Reference Substance Mixtures

% Ba(NO3)2

Burning Time [s]

Burning rate [mm/s]

50

56.69

3.53

60

63.19

3.17

70

71.53

2.80

2.2.6 Burning Rates Test Substance

2.2.6.1 Pre-Test

In the following table, the measured data of the test substance mixtures are presented.

Table 2.2.6.1-a: Burning Rate of Test subatance Mixtures at the pre-test

% Test Substance

Burning Time [s]

Burning rate [mm/s]

10

68.06

2.94

20

67.25

2.97

30

74.16

2.70

40

77.73

2.57

50

103.25

1.94

60

120.22

1.66

70

179.25

1.12

80

265.72

0.75

90

Flame died alter 196.19 s (corresponds to approx. 5.5 cm)

No determination of the burning time/rate possible.

No signs of oxidizing properties were observed.

The burning rate in all cases was found to be lower than the highest burning rate of the reference substance mixtures. From this follows that the determination of burning rate should be repeated a further five times for these three mixture-ratios of test substance/cellulose which showed the highest burning rates.

2.2.6.2 Main Test

The data are presented in the following tables.

Table 2.2.6.2-a: Determination ol burning rate mixture 10/90 % test substance/cellulose

Measurement

Burning Time [s]

Burning rate [mm/s]

1

60.06

3.33

2

54.37

3.68

3

54.44

3.67

4

57.72

3.47

5

58.36

3.43

6*

59.32

3.37

Mean

 

3.49

Standard Deviation

 

0.15

Standard Deviation [% ]

 

4.32

*As the first measurement (pre-test 2.2.6.1) showed high deviation, an additional measurement was conducted. The value of the pre-test was definitely slower than the measurements at the main test. This value was not used for calculation.

Table 2.2.6.2-b: Determination of burning rate mixture 20/80 % test substance/cellulose

Measurement

Burning Time [s]

Burning rate [mm/s]

1

59.56

3.36

2

66.06

3.03

3

66.06

3.03

4

63.24

3.16

5

65.33

3.06

6 (from the pre-test)

67.25

2.97

Mean

 

3.10

Standard Deviation

 

0.14

Standard Deviation [% ]

 

4.52

Table 2.2.6.2-c: Determination of burning rate mixture 30/70 % test substance/cellulose

Measurement

Burning Time [s]

Burning rate [mm/s]

1

66.93

2.99

2

68.43

2.92

3

77.90

2.57

4

72.46

2.76

5

76.34

2.62

6 (from the pre-test)

74.16

2.70

Mean

 

2.76

Standard Deviation

 

0.17

Standard Deviation [% ]

 

6.05

3 Results

The highest burning rate of the three mixtures test substance/cellulose was determined to 3.68 mm/s. The maximum burning rate of the reference substance was determined to 3.53 mm/s. These results indicate that the test substance shows oxidising properties which are incoherent to and thus in contrast to the observations made within the conduct of the study. In detail, in contrast to the numerical results, oxidising properties of the test substance were not clearly observable e.g. as sparks or cracks etc. Therefore and in order to verify the observations or the measurement results, the critical mixture ratio of 10% test substance was additionally tested for oxidising properties in an inert atmosphere (under argon). During the verification test under argon, the mixture with 10% test substance did not ignite at all. Therefore, a determination of the burning rate was not possible and no further tests were necessary. The test substance can classified as being not oxidising under the test conditions.

Interpretation of results:
other: not oxidising
Conclusions:
Based on the results obtained with the test substance/cellulose mixture 10/90 under argon atmosphere, the test item is considered to have no oxidising properties.
Executive summary:

The oxidising properties of 1-Benzyl-3-carbamoyl-pyridinium, chloride were determined according to EU Method A.17 "Oxidising Properties (Solids)".

In a first step a pre-test was performed with a test substance-cellulose-ratio of 2:1. The mixture for the preliminary test burned with a strong sooting flame, but without observable dangerous reactions (e. g. sparking). As the preliminary test did not clearly indicate whether the test substance has oxidizing properties, the main test was performed.

The main test was conducted using different mixtures of test substance:cellulose containing 10% to 90 % (w/w) of the test substance in 10 % increments. Likewise, mixtures of Ba(N03)2 as reference substance and cellulose were prepared containing 50 %, 60 % and 70 % (w/w) of the reference substance. The different mixtures were arranged in piles and a Teclu burner was applied to one end of each pile. The reaction time was measured over a distance of 200 mm using a stop watch after the flame had propagated an initial distance of 30 mm. This test was repeated five times, each, for those three test substance/cellulose mixture-ratios, which resulted in the highest burning rates.

The highest burning rate overall with test substance was determined to 3.68 mm/s with the 10 %-mixture (w/w) while the maximum burning rate with reference substance was determined to 3.53 mm/s. These results indicate that the test substance shows oxidising properties which are incoherent to and thus are in contrast to the visual observations made within the conduct of the study. In detail, in contrast to the numerical results, oxidising properties of the test substance were not clearly observable e.g. as sparks or cracks etc. In order to prevent a potential false positive result, the critical mixture was subjected to the additional test of oxidising properties in an inert atmosphere (argon). As no ignition occurred in the inert atmosphere and a determination of a burning rate was thus not possible, 1-Benzyl-3-carbamoyl-pyridinium, chloride is considered to have no oxidising properties.

Description of key information

The oxidising properties of 1-Benzyl-3-carbamoyl-pyridinium, chloride were determined according to EU Method A.17 "Oxidising Properties (Solids)".

In a first step a pre-test was performed which, however, did not clearly indicate whether the test substance has oxidizing properties. Thus, the main test was performed using different mixtures of test substance:cellulose containing 10% to 90 % (w/w) of the test substance in 10 % increments. Likewise, mixtures of Ba(N03)2 as reference substance and cellulose were prepared containing 50 %, 60 % and 70 % (w/w) of the reference substance.

The highest burning rate overall with test substance was determined to 3.68 mm/s with the 10 %-mixture (w/w) while the maximum burning rate with reference substance was determined to 3.53 mm/s. These results indicate that the test substance shows oxidising properties which are incoherent to and thus are in contrast to the visual observations made within the conduct of the study. In detail, in contrast to the numerical results, oxidising properties of the test substance were not clearly observable e.g. as sparks or cracks etc.

In order to prevent a potential false positive result, the critical mixture was subjected to the additional test of oxidising properties in an inert atmosphere (argon). As no ignition occurred in the inert atmosphere and a determination of a burning rate was thus not possible, 1-Benzyl-3-carbamoyl-pyridinium, chloride is considered to have no oxidising properties.

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Justification for classification or non-classification

Based on the results obtained with the test substance/cellulose mixture 10/90 under argon atmosphere, the test item is considered to have no oxidising properties.