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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:
2017-02-20
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
Qualifier:
according to
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Deviations:
no
GLP compliance:
no
Key result
Auto-ignition temperature:
475 °C
Atm. press.:
1 013 hPa

Preliminary test

The following table shows the results of the preliminary test. Temperatures where auto-ignition was detected are marked with +; temperatures where no auto-ignition was detected are marked with - in the below table. The amount of test item tested at each measurement is indicated as numbers of portions (i.e. spatula tips).

 

Auto-ignition temperature (preliminary test)

T / ° C

portions

+ / -

Time lag / s

202

5

-

-

252

5

-

-

302

5

-

-

352

5

-

-

402

5

-

-

452

5

-

-

502

5

+

2

472

5

-

-

492

5

+

6

482

5

+

8

477

5

-

-

 

barometric pressure: 1014.1 hPa

The lowest auto-ignition temperature of the test item was determined to be 482 °C in the preliminary test.

 

Auto-ignition temperature (summary)  

Main test series

Auto-ignition temperature / °C

Time lag / s

1. main test (5 K)

477

8

1. main test (2 K)

477

8

2. main test (2 K)

476

4

3. main test (2 K)

476

8

The lowest auto-ignition temperature of the test item was determined to be 476 °C in the main test. Due to safety reasons and according to the guidelines the lowest measured temperature at which an ignition was observed was rounded to the next lower number divisible by 5, giving a value of 475 °C.

Conclusions:
The auto-ignition temperature of the test item was determined to be 475 °C at 1013 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 (reference 4.12 -1). In a preliminary test the approximately auto-ignition temperature were 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 2 K until no ignition was observed. The test was repeated with slighter temperature steps to determine the auto-ignition temperature more accurately. 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. All three values lay within a range of 20 K. Therefore the auto-ignition temperature was stated to be 475 °C.

Description of key information

The auto-ignition temperature of the test item was determined to be 475 °C at 1013 hPa.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
475 °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 (reference 4.12 -1). In a preliminary test the approximately auto-ignition temperature were 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 2 K until no ignition was observed. The test was repeated with slighter temperature steps to determine the auto-ignition temperature more accurately. 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. All three values lay within a range of 20 K. Therefore the auto-ignition temperature was stated to be 475 °C.