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Physical & Chemical properties

Auto flammability

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Endpoint:
auto-ignition temperature (liquids)
Type of information:
not specified
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data comes from an online compilation using secondary data sources. There is no experimental study reference, however data is cited in the database as peer reviewed. Therefore it is considered as reliable, but with restrictions due to lack of details.
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Principles of method if other than guideline:
No data.
Auto-ignition temperature:
255 °C
Atm. press.:
ca. 101 325 Pa
Remarks on result:
other:
Remarks:
Atmospheric pressure not specified, but assumed to be ambient.
Executive summary:

The HSDB database provides, as secondary source, some physico-chemical properties. An auto-ignition temperature of 255°C is cited for alpha-pinene.

Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study has been conducted according to internationally recognised guideline. No deviation is reported. The substance is adequately caracterised. Therefore full validation applies.
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Qualifier:
according to
Guideline:
other: DIN 51794:2003-05
GLP compliance:
no
Key result
Auto-ignition temperature:
270 °C
Atm. press.:
99 057 Pa

 Step

T-vessel

Drops used

Ignition delay

 Observations

 Pre-test

294.4°C

5

24 s

 flame and plop

 Main study – first test series

276.2°C

8

30 s

 flame and plop

 Main study – determination of lowest value

276.1°C

16

26 s

 flame

 Main study – repetition

272.5°C

8

42 s

 flame

 

Detailed findings for each step are provided in the experimental report.

Atmospheric pressure ranged between 99057 and 99768 Pa during the study.

The lowest measured value of the auto ignition temperature is 272°C.

The auto ignition temperature (result of determination) is the lowest value from the three experiments, rounded down to a whole multiple of 5°C. Therefore, the auto ignition temperature is stated as 270°C.

Executive summary:

The auto-ignition temperature of the test substance was measured according to EU A15/DIN 51794 guideline. Three main test were performed, the relevant parameters were recorded, and results ranged between 272 and 276°C. The lowest result, rounded down to 5°C, i.e. 270°C, is retained.

Endpoint:
auto-flammability
Type of information:
not specified
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data comes from an online compilation using secondary data sources. There is no experimental study reference, however data is cited in the database as peer reviewed. Therefore it is considered as reliable, but with restrictions due to lack of details.
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Principles of method if other than guideline:
No data.
Auto-ignition temperature:
237 °C
Atm. press.:
ca. 101 325 Pa
Remarks on result:
other:
Remarks:
Atmospheric pressure not specified, but assumed to be ambient.
Executive summary:

The HSDB database provides, as secondary source, some physico-chemical properties. An auto-ignition temperature of 237°C is cited for limonene.

Description of key information

Auto-ignition temperature expected to be similar for both qualities.

No particular hazard is anticipated in normal conditions of storage.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
270 °C

Additional information

A fully reliable experimental study, conducted according to a recognized EC method and under GLP, is available for the crude quality. It is therefore considered as a key study. The result is retained as key data for purpose of CSA.

No literature data is available for the very major component Cineol, however, from data on the two other majors, respectively 237°C for limonene, and 255°C for alpha-pinene, it is likely that the AIT of the oil is driven by Cineol, and not by the most auto-flammable, as already shown under IU section 4.11 for flash point.

Therefore, for the rectified quality containing more cineole, the AIT is expected to be similar.

This parameter is not relevant for classification according to CLP, however the information is useful regarding potential additional fire hazard.