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Auto flammability

Link to relevant study record(s)

Reference

Endpoint:

auto-ignition temperature (liquids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

29 May and 31 May 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

The study was conducted according to an internationally recognised method. The test substance is adequately characterised. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))

Version / remarks:

2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

DIN EN 14522, Method P (Determination of the auto ignition temperature of gases and vapours)

Version / remarks:

2005

Deviations:

no

Principles of method if other than guideline:

Not applicable

GLP compliance:

no

Key result

Auto-ignition temperature:

259 °C

Atm. press.:

>= 974 - <= 977 hPa

RESULTS:

First trial

The preselected auto-ignition temperature was set to 150°C but no ignition occurred during this trial

Second trial

The preselected auto-ignition temperature was set to 250°C.

Firstly, VORB program was used with an amount of 5 droplets for each test. Ignition occurred for a sample temperature of 298.9°C. Then H-A1 program and H-A2 program were conducted. For the first determination, H-A1 program was performed from 294°C using 5 droplets by decreasing temperature in 5°C steps as ignition occurred.

At 289°C, ignition occurredwith 5 droplets.

At 284°C, ignition occurred with 5 droplets.

At 279°C, ignition occurred with 5 droplets.

At 274°C, ignition did not occur with 2 and 5 droplets. Ignition occurred with 8 droplets.

At 269°C, ignition occurred with 8 droplets.

At 264°C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 8, 2, 5 and 11 droplets but no ignition occurred.

H-A2 program was then used from 267°C using 8 droplets by decreasing temperature in 2°C steps as ignition occurred.

At 265°C,ignition did not occurred with 2, 5 and 8 droplets. Ignition occurred with 11 droplets.

At 263°C, ignition occurred with 11 droplets.

At 261°C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 8, 2, 5 and 11 droplets but no ignition occurred.

The last ignition occurred at 263°C using 11 droplets during H-A2 program and correspond to the first auto-ignition temperature (LASTIP on raw data presented in the experimenatl report).

For the second determination, temperature was then increased to the value obtained with VORB program (299°C) and H-A1 program was performed using 11 droplets. The same operatory mode as for the first determination was performed and the lowest auto-ignition was found at 269°C using 8 droplets.

A third determination was performed as for the second one and a lowest auto-ignition temperature of 269°C with 8 droplets was found.

The lowest value (263°C) was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) and rounded to the nearest 1 °C. A final auto-ignition temperature (END IP VALUE in raw data presented in the experimental report) of 259°C was obtained. The atmospheric pressure was 974.0 hPa at the beginning of the test and 977.0 hPa at the end of the test.

Discussion

Two trials were conducted. In the first one, the preselected auto-ignition temperature was set to 150°C but no ignition occurred and the test stopped automatically. In the second one, the preselected auto-ignition temperature was set to 250°C. The auto-ignition of the substance was tested in varying amount of substance (between 2 and 11 droplets) and temperature (between 261 and 299°C).

Finally, three determinations were performed and then, three lowest auto-ignition temperatures were recorded as 263°C, 269°C and 269°C respectively using 11, 8 and 8 droplets. As these temperatures did not differ by more than 2% from the mean, these results were considered as valid and the lowest value (263°C) was retained. As described in DIN EN 14522:2005, the final auto-ignition temperature was obtained in reducing the retained value by the absolute deviation calculated using the reproducibility value (1.5% relative). This value was rounded to the nearest 1 °C and a final auto-ignition temperature (END IP VALUE in raw data) of 259°C was obtained.

Moreover, the apparatus control was performed less than 6 months before the test (control between 25 April and 27 April 2018 and measurements dated on 29 to 31 May 2018). The lowest auto-ignition temperature measured for each reference substance did not differ by more than 1.5% from the reference value.

Therefore, the results of this study were considered as valid.

Conclusions:

The auto-ignition temperature of test item was determined to be 259°C.
This parameter/method is not relevant for classification, however the information is useful regarding potential additional fire hazard. No particular hazard is anticipated in normal conditions of storage.

Executive summary:

The study was performed in order to determine the auto-ignition temperature of test item according to EU A.15 guideline.

Two trials were conducted. In the first one, the preselected auto-ignition temperature was set to 150°C but no ignition occurred and the test stopped automatically. In the second one, the preselected auto-ignition temperature was set to 250°C and three auto-ignition temperature were recorded: 263°C, 269°C and 269°C.

As these three auto-ignition temperature obtained with the determination program did not differ by more than 2% from the mean, the results were validated and the lowest value (263°C) was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.

This value was rounded to the nearest 1 °C and a final auto-ignition temperature of 259°C was obtained.

The atmospheric pressure was 974.0 hPa at the beginning of the test and 977.0 hPa at the end of the test.

Description of key information

The auto-ignition temperature of test item was determined to be 259°C between 974 and 977 hPa

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

259 °C

Additional information

A fully reliable experimental study, conducted according to EU A.15 guideline is available.

It is considered as a key study, and the result is retained as key data.

This parameter is not relevant for classification, however the information is useful regarding process safety and potential additional fire hazard.