Essential oil of Citrus sinensis (Rutaceae) peel, terpene-free

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:

07 October 2020 - 09 October 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2005

Deviations:

no

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

440/2008 of 30 May 2008 (referring to DIN 51794 “Bestimmung der Zündtemperatur“, dated May 2003)

Deviations:

yes

Remarks:

DIN EN14522 is not reported in EU-Method A.15. After one variation of drops the 2°C test modus starts, even when an ignition has occurred and it is possible that more ignition trials are conducted. This deviation was considered as uncritical.

GLP compliance:

yes (incl. QA statement)

Remarks:

Inspection date : 15-16 November 2017 ; Certificate date : 15 May 2018

Key result

Auto-ignition temperature:

230 °C

Atm. press.:

>= 993.5 - <= 1 003.3 mBar

Measurements of pre-determination given by the instrument (242.7 °C using 5 drops, Flame and plop after 54 sec) and measurements recorded during the main tests are reported in the study report. The lowest values obtained at each test series were reported as follows.

Table 1: Lowest Values recorded in the Main Test

Experiment	Value (rounded to integer)	Ignition delay	Drops used	Atmospheric pressure
Frist test series	237°C	63 s	5	993.5 mbar
Second test series	235°C	68 s	9	1003.3 mbar
Third test series	234°C	67 s	9	1003.0 mbar

The lowest value of the auto ignition temperature is 234 °C. This value was determined using 9 drops test item. The test item showed auto ignition after 67 seconds.
The auto ignition temperature (result of determination) is the lowest value from the lowest values of the three experiments, rounded down to a whole multiple of 5 °C. Therefore, the auto ignition temperature is stated as 230 °C.

The requirements for repeatability of the DIN standard are stated as follows: Three lowest values of the main test have to lie within a range of 5 K for an auto ignition temperature below 300 °C. The largest difference between measured ignition temperatures was 3 °C. Therefore, full validation applies.

Conclusions:

The auto ignition temperature of the test item is stated as 230 °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 conducted under GLP according to standard DIN EN 14522 : 2005 (not listed in EU A.15 guideline) and DIN 51794 : 2003 (listed in EU A.15 guideline).

Under the test conditions, the lowest temperature that will result in the ignition of the test item after being injected into the apparatus was determined as 230°C between (993.5 and 1003,3 mbar). 

This value was determined using 9 drops of test item. The test item showed auto ignition after 67 seconds.

Then, the value was rounded down to a whole multiple of 5 °C and the auto-ignition temperature of Essential oil of Citrus sinensis (Rutaceae) peel, terpene-free was stated as 230 °C.

Description of key information

The auto-ignition temperature of the test item is stated as 230 °C (between 993,5 and 1003,3 mbar.)

No particular hazard is anticipated in normal conditions of storage.

Additional information

A GLP fully reliable experimental study, conducted according to a recognized EU/DIN method, is available. Therefore, it is considered as a key study. The result is retained as key data.

This parameter is not relevant for classification, however the information is useful regarding process.