Quaternary ammonium compounds, C18-22 (even numbered) alkyltrimethyl, chlorides; Docosyltrimethylammonium chloride; C18-22 TMAC

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Link to relevant study record(s)

Reference

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From January 31, 2018 to February 15, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.16 (Relative Self-Ignition Temperature for Solids)

Deviations:

no

GLP compliance:

no

Key result

Relative self-ignition temperature:

> 329 °C

Remarks on result:

no self ignition observed under the test conditions

Results discussion:

The melting point of the sample was determined to be in the approximate range 220°C – 240°C using the Buchi B540 apparatus in rapid ramping mode. The sample was tested three times and on no occasion did the sample temperature exceed 400ºC, the protocol criteria indicating that self-ignition has occurred. During runs 2 and 3 no indication of elevated temperature was observed in the sample. During run 1 the sample temperature did become elevated at around 205ºC oven temperature with the sample reaching a maximum of 329ºC (compared to a reference temperature of 220°C) before cooling again.

It is considered that this observation may have been due to there being insufficient sample to maintain ignition long enough to reach the 400ºC threshold and therefore for runs 2 and 3 the size of the gauze box was increased slightly to 25x25x25mm. However, no further evidence of ignition was observed in these runs and it was apparent when the oven was opened that the sample had melted and that any charring and burning was of melted material that had come into contact with the oven shelf.

It is therefore considered most likely that during run one the sample simply softened and partially melted before coming into contact with the oven surface and igniting.

Conclusions:

Under the study conditions, the self-ignition temperature of the test substance can be considered to be > 329°C.

Executive summary:

A study was conducted to determine the relative self ignition temperature of the test substance according to EU Method A16. During the study, the sample was tested three times and on no occasion did the sample temperature exceed 400ºC, indicating that self-ignition has occurred. During runs 2 and 3 no indication of elevated temperature was observed in the sample. During run 1 the sample temperature did become elevated at around 205ºC oven temperature with the sample reaching a maximum of 329ºC (compared to a reference temperature of 220°C) before cooling again. Under the study conditions, the self-ignition temperature of the test substance can be considered to be >329°C (Chemex, 2018).

Description of key information

The relative self ignition temperature of the test substance was determined according to EU Method A.16 (Chilworth, 2017).

Additional information

Value used for CSA: >329°C at 101325 Pa

(no self-ignition observed up to 329°C at 101325 Pa)