Carvacrol-rich essential oil obtained from the leaves of Origanum spp., Labiatae, by distillation

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:

10-12 July 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, and under GLP. 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:

yes

Remarks:

Inspected on 4,5 and 6 July 2016/ Signed on 10 January 2017

Key result

Auto-ignition temperature:

443 °C

Atm. press.:

>= 981 - <= 984 hPa

Three 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 350°C but no ignition occurred and the test stopped automatically.

In the third one, the preselected auto-ignition temperature was set to 550°C.The auto-ignition of the substance was tested in varying amount of substance (between 2 and 11 droplets) and temperature (between 446°C and 471°C).

Finally, three determinations were performed and then, three lowest auto-ignition temperatures were recorded as 451°C, 451°C and 450°C respectively using 5, 5 and 5 droplets.

As these temperatures did not differ by more than 2%, these results were considered as valid and the lowest value (450°C) wasretained. 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 wasrounded[SS1] to the nearest 1 °C and a final auto-ignition temperature (END IP VALUE in raw data) of 443°C was obtained.

Moreover, the apparatus control was performed less than 6 months before the test (control between 25 April and 27 April 2018and measurements dated on 10 to 12 July 2018). The lowest auto-ignition temperature measured for each reference substance did not differ by more than 1.5% from the reference value.

Conclusions:

The auto-ignition temperature of test item was determined to be 443°C (lowest value of three determinations).
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.

The auto-ignition temperature of test item was determined to be 443°C (lowest value of three determinations). This value was determined using approximately 5 drops of test substance at 981 -984 hPa.

Description of key information

The auto-ignition temperature of test item was determined to be 443°C. (lowest value of three determination).

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

443 °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.