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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 Oct - 24 Oct 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study conducted in accordance with international guidelines and in accordance with GLP. All relevant validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to guideline
Guideline:
DIN EN 14522, Method S (Determination of the auto ignition temperature of gases and vapours)
Qualifier:
according to guideline
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
GLP compliance:
yes (incl. QA statement)
Key result
Auto-ignition temperature:
195 °C
Atm. press.:
>= 1 000.1 - <= 1 000.6 hPa

The preliminary test is shown in Table 1. 5 drops of test material were put into the Erlenmeyer flask at each temperature. The results from the main test, where the lowest temperature at which ignition occurred, are shown in Table 2.

Based on the results of the main test series, the lowest auto-ignition temperature was 197°C. This was rounded down to the nearest multiple of 5°C, to 195 °C.

Table 1. Results from the preliminary test

 

PRELIMIINARY TEST

TEMPERATURE (°C)

203

193

IGNITION +/-

+

-

 

Atmospheric pressure: 1002.4 hPa

Ignition is denoted as +, no ignition is denoted as -

Table 2. Results from the main test

MAIN TEST SERIES

LOWEST TEMPERATURES OF AN IGNITION (°C)

HIGHEST REMPERATURES WITHOUT AN IGNITION (°C)

ATMOSPHERIC PRESSURE (hPa)

1

197 (5 droplets / time-lag 47s)

194 (1 to 10 droplets)

1000.1-1002.5

2

198 (5 droplets / time-lag 41s)

195 (1 to 10 droplets)

1000.2-1000.6

3

198 (5 droplets / time-lag 39s)

195 (1 to 10 droplets)

1000.2

Conclusions:
The test substance has an auto-ignition temperature of 195°C.
Executive summary:

The substance auto-ignition temperature was tested according to the Regulation EC no. 440/2008 Method A.15 Auto-Ignition Temperature (Liquids and Gases) and DIN 51794 (2003): Determination of Ignition Temperature.

Preliminary test: Started at a temperature of approx. 200°C.At this temperature 5 drops of test item were added to the Erlenmeyer flask and it was checked if ignition occurs using a small mirror. Any type of flame within 5 minutes after addition will be counted as ignition. In case of an ignition the temperature was reduced by approx. 10K to narrow down the temperature where an ignition occurred up to a temperature of 650°C, the main test had not been performed. The lowest ignition temperature found in the preliminary test was used as start temperature for the main test. The atmospheric pressure during the tests was recorded.

Main test: Started at the lowest auto-ignition temperature found in the preliminary test, then decreased at 3K intervals, and repeated until no ignition was observed. At this temperature, the number of drops of test item added to the Erlenmeyer flask was varied (1 -10 drops). Further tests were carried out at a variety of of temperatures, and number of drops in the range where the test item ignited and just short of ignition.

The test substance has an auto-ignition temperature of 195°C.

Description of key information

Autoignition Temperature = 195 °C; EU Method A.15; Anon, 2016

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
195 °C

Additional information

In a single key study, the auto-ignition temperature of the substance was tested according to the Regulation EC no. 440/2008 Method A.15 Auto-Ignition Temperature (Liquids and Gases) and DIN 51794 (2003): Determination of Ignition Temperature.

Preliminary test: Started at a temperature of approx. 200°C.At this temperature 5 drops of test item were added to the Erlenmeyer flask and it was checked if ignition occurs using a small mirror. Any type of flame within 5 minutes after addition will be counted as ignition. In case of an ignition the temperature was reduced by approx. 10K to narrow down the temperature where an ignition occurred up to a temperature of 650°C, the main test had not been performed. The lowest ignition temperature found in the preliminary test was used as start temperature for the main test. The atmospheric pressure during the tests was recorded.

Main test: Started at the lowest auto-ignition temperature found in the preliminary test, then decreased at 3K intervals, and repeated until no ignition was observed. At this temperature, the number of drops of test item added to the Erlenmeyer flask was varied (1 -10 drops). Further tests were carried out at a variety of of temperatures, and number of drops in the range where the test item ignited and just short of ignition.

The test substance has an auto-ignition temperature of 195°C.

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