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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:
2019-03-18 to 2019-03-20
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))
Deviations:
no
GLP compliance:
no
Key result
Auto-ignition temperature:
310 °C
Atm. press.:
1 013.25 hPa

Preliminary Test

An approximate value of the ignition temperature of the test item was first determined by a preliminary test. The table below summarizes the results of the preliminary test. An “ignition” is indicated as “+” and “no ignition” as “-“. 5 drops were added into the Erlenmeyer flask at each temperature. 

Results of the preliminary test

 

Preliminary test

Temperature

/°C

206

254

302

350

343

333

323

313

305

Ignition / +/-

-

-

-

+

+

+

+

+

-

 

Atmospheric pressure: 1005.8 - 1014.8 hPa

In the preliminary test, an ignition was observed at 313 °C.

 

Main Test

The lowest temperatures at which an ignition occurred in the main tests are given in the table below. 

Lowest temperatures at which an ignition occurred

Main test series

Lowest temperatures
of an ignition

Highest temperatures
without an ignition

Atmospheric
Pressure

1

316 °C

313 °C

1014.9 hPa

2

311 °C

309 °C

1015.3 - 1021.2 hPa

3

314 °C

311 °C

1021.7- 1022.3 hPa

Based on results of the main test series, the lowest autoignition temperature was 311 °C.

Regulation EC No. 440/2008 and DIN 51794: The auto-ignition temperature rounded down to the nearest multiple of 5°C was determined as 310°C.

Conclusions:
The auto-ignition temperature was determined to be 310 °C at 1013.25 hPa.
Executive summary:

A study was conducted according to Regulation (EC) No 440/2008 Part A A.15 to determine the auto-ignition temperature of the test substance. In a preliminary test the approximately auto-ignition temperature was determined. For the main test three test series were conducted. The temperature determined in the preliminary test was used as starting point for the main test. The temperature was decreased by 5 K until no ignition was observed. The test was repeated with slighter temperature steps to determine the auto-ignition temperature more accurate. Based on results of the main test series, the lowest auto-ignition temperature was 311°C. All three values lay within a range of 20 K. According to criteria as laid down in DIN 51794 the auto ignition temperature is the lowest value out of three experiments rounded down to a whole multiple of 5°C. Therefore the auto-ignition temperature was stated to be 310°C.

Description of key information

The auto-ignition temperature was determined to be 310 °C at 1013.25 hPa.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
310 °C

Additional information

A study was conducted according to Regulation (EC) No 440/2008 Part A A.15 to determine the auto-ignition temperature of the test substance. In a preliminary test the approximately auto-ignition temperature was determined. For the main test three test series were conducted. The temperature determined in the preliminary test was used as starting point for the main test. The temperature was decreased by 5 K until no ignition was observed. The test was repeated with slighter temperature steps to determine the auto-ignition temperature more accurate. Based on results of the main test series, the lowest auto-ignition temperature was 311°C. All three values lay within a range of 20 K. According to criteria as laid down in DIN 51794 the auto ignition temperature is the lowest value out of three experiments rounded down to a whole multiple of 5°C. Therefore the auto-ignition temperature was stated to be 310°C.