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Auto flammability

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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2020-02-11 to 2020-03-26
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Version / remarks:
440/2008/EC, 30 May 2008
Deviations:
no
Qualifier:
according to
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Version / remarks:
2003
Deviations:
no
GLP compliance:
yes (incl. certificate)
Key result
Auto-ignition temperature:
295 °C
Atm. press.:
>= 1 004.3 - <= 1 017.2 hPa

An approximate value of the ignition temperature of the test item was first determined by a preliminary test. Table 1 gives the result of the preliminary test. An ignition is denoted as “+” and no ignition is denoted as “-”. 5 drops were put into the Erlenmeyer flask at each temperature.

Table1:    Results of the preliminary test

Preliminary Test

Temperature / °C

Ignition / +/-

207

-

251

-

300

-

355

+

344

+

335

+

325

+

316

+

306

+

293

-

Atmospheric pressure: 1007.8 hPa

In the preliminary test, the lowest temperature at which an ignition occurred was 306 °C.

 

The lowest temperatures at which an ignition occurred in the main test are given in Table2.

Table2:     Lowest temperatures at which an ignition occurred

Main test series

Lowest temperatures of an ignition [°C]

Highest temperatures without an ignition [°C]

Atmospheric Pressure [hPa]

1

298

297

1004.3 – 1004.6

2

296

294

1004.4 – 1004.6

3

296

295

1017.1 – 1017.2

Based on the results of the main test series, the lowest auto-ignition temperature was 296 °C. The auto-ignition temperature rounded down to the nearest multiple of 5 °C was determined as 295 °C.

Conclusions:
The test item has an auto-ignition temperature of 295 °C.
Executive summary:

A study was conducted according to Regulation (EC) No 92/69 method A.15 and DIN 51794 to determine the auto-ignition temperature of the test substance. The main test was started at the lowest auto-ignition temperature found in the preliminary test and the temperature was then decreased in intervals of 1 - 2 K. This was repeated until no ignition was observed. The auto-ignition temperature of the test item was found to be 295 °C. This value was the lowest auto-ignition temperature of three independent measurements rounded down to the nearest multiple of 5 °C.

Description of key information

The test item has an auto-ignition temperature of 295 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
295 °C

Additional information

A study was conducted according to Regulation (EC) No 92/69 method A.15 and DIN 51794 to determine the auto-ignition temperature of the test substance. The main test was started at the lowest auto-ignition temperature found in the preliminary test and the temperature was then decreased in intervals of 1 – 2 K. This was repeated until no ignition was observed. The auto-ignition temperature of the test item was found to be 295 °C. This value was the lowest auto-ignition temperature of three independent measurements rounded down to the nearest multiple of 5 °C.