(E,Z)-2,6-dimethylocta-2,4,6-triene

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:

20 March 2017 - 21 March 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Well documented study performed according to EU A.15 guideline, under GLP and without deviation

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2017-01-10

Auto-ignition temperature:

ca. 246 °C

Atm. press.:

ca. 976 hPa

Remarks on result:

other: First determination

Auto-ignition temperature:

ca. 246 °C

Remarks on result:

other: Second determination

Auto-ignition temperature:

ca. 246 °C

Atm. press.:

ca. 976 hPa

Remarks on result:

other: Third determination

Key result

Auto-ignition temperature:

ca. 242 °C

Remarks on result:

other: Final value

Results (see table):

First trial:

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

Second trial:

The preselected auto-ignition temperature was set to 350 °C.

Firstly, VORB program was used with an amount of 5 droplets for each test.

Ignition occured for a sample temperature of 270.7°C.

Then H-A1 program and H-A2 program were conducted.

For the first determination, H-A1 program was performed from 266 °C using 5 droplets by decreasing temperature in 5 °C steps as ignition occurred.

At 241 °C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 2, 8 and 11 droplets but no ignition occured.

H-A2 program was then used from 244 °C using conecutively 5, 2, 8 and 11 droplets but no ignition occured.

The last ignition occured at 246 °C using 5 droplets during H-A1 program and correspond to the first auto-ignition temperature (LASTIP on raw data).

For the second determination, temperature was then increased to the value obtained with VORB program (271 °C) and H-A1 program was performed using 5 droplets. The same operatory mode as for the first determination was performed and the lowest auto-ignition was found at 246 °C using 5 droplets.

A third determination was performed as for the second one and a lowest auto-ignition temperature of 246 °C with 5 droplets was found.

The lowest value (246 °C) was reduced by the absolute deviation calculated using the reproducibility value (1.5 % relative) and rounded up to the next 1 °C.

A final auto-ignition temperature (END IP VALUE in raw data) of 242 °C was obtained.

The atmospheric pressure was 976.0 hPa at the beginning of the test and 976.0 hPa at the end of the test.      

Conclusions:

According to EU method A.15, auto-ignition temperature of 242°C was estimated for the test item.

Executive summary:

A study was performed to determine the auto-ignition Temperature of the test item (E,Z)-2,6-DIMETHYLOCTA-2,4,6-TRIENE. The method followed was designed to be compliant with the Council Regulation (EC) No 440/2008, Method A.15: ''Auto-ignition Temperature (Liquids and gases)''.

In this method, the auto-ignition temperature of the test item was determined by varying the temperature of the test vessel and the amount of test substance. The lowest temperature where ignition occurs was retained and, in order to take into account all uncertainties (calibration, temperature measuring system, amount of substance etc.), this lowest value was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.

Two trials were conducted. In the first one, the preselected auto-ignition temperature was set to 150 °C but no ignition occured and the test stopped automatically. In the second one, the preselected auto-ignition temperature was set to 350 °C and three auto-ignition temperature were recorded (recorded as LASTIP on raw data): 246 °C, 246 °C and 246 °C.

As these three auto-ignition temperature obtained with the determination program did not differ by more than 2%, the results were validated and the lowest value (246 °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 up to the next 1 °C and a final auto-ignition temperature (END IP VALUE in raw data) of 242 °C was obtained.

The atmospheric pressure was 976.0 hPa at the beginning of the test and 976.0 hPa at the end of the test.

Description of key information

The self-ignition temperature of (E,Z)-2,6-DIMETHYLOCTA-2,4,6-TRIENE at atmospheric pressure is 242 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

242 °C

Additional information

A well performed study was conducted according to EU A.15 guideline and under GLP to determine the self-ignition temperature. The result was considered as reliable without restriction.