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Reference
Endpoint:
relative self-ignition temperature (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:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Key result
Relative self-ignition temperature:
> 233 °C
Remarks on result:
no self-ignition observed up to the melting point

Temperature Data

The temperatures which were measured in the experiment are presented in the following table. As many values were recorded, only the values every 60 minutes (until the oven had reached the chosen temperature) are presented.

Presentation of temperatures versus time

Time in min

Temperature (test item)

in °C

Temperature (oven)

in °C

5

22.7

20.4

60

33.3

46.5

120

62.9

82.5

180

95.2

117.2

240

127.5

154.1

300

161.6

188.8

360

191.3

222.0

420

218.3

237.3

435

219.5

241.4

 

Determination of heating rate

The heating rate was calculated using the following equation:

Heating rate = (T2 -T1)/(t2 -t1)

T1 = Temperature after 5 minutes in °C

T2 = End temperature in °C

t1 = 5 min

t2 = time at which the end temperature was reached in min.

Presentation of result heating rate

T1 in °C

20.4

t1 in min

5

T2 in °C

241.4

t2 in min

435

Heating rate in °C/min.

0.5140

Conclusions:
Under the study conditions, relative self-ignition temperature for the test substance is determined to be >233°C.
Executive summary:

A study was conducted to determine the relative self-ignition temperature of the substance, Quaternary ammonium compounds, N,N,N'-tris(hydroxyethyl)-N,N'-dimethyl-N'-tallow alkyltrimethylenedi-, bis(Me sulfates) (salts), according to the EU Method A.16. For the test no sample preparation was necessary. The cube was filled with the test substance and was tapped gently, adding more of the test substance until the cube was completely full. The cube was then mounted in the ovenat 20.4 °C a thermo element placed at the centre of the cube. The temperature of the oven was measured every 5 minutes while the temperature of the oven was increased to 240°C with a nominal heating rate of 0.51 K/min. No increase in the temperature of the sample in comparison to that of the oven observed, also no signs of ignition observed. Under the study conditions, relative self-ignition temperature for the test substance is determined to be >233°C (Krebs, 2018).

Description of key information

The relative self-ignition temperature was determined according to EU Method A.16 (Krebs, 2018).

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
233 °C

Additional information

The relative self ignition temperature of the test substance determined to be >233°C.