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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 2018-01-05 to 2018-03-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to guideline
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
DIN EN 14522, Method P (Determination of the auto ignition temperature of gases and vapours)
Deviations:
no
Qualifier:
according to guideline
Guideline:
DIN EN 14522, Method S (Determination of the auto ignition temperature of gases and vapours)
Deviations:
no
GLP compliance:
no
Key result
Auto-ignition temperature:
265 °C
Atm. press.:
>= 987.1 - <= 1 000.5 hPa

Preliminary Test

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

 

Table1: Results of the preliminary test

 

Preliminary test

Temperature / °C

203

255

301

293

281

271

Ignition / +/-

-

-

+

+

+

-

 

Atmospheric pressure: 986.1 hPa

In the preliminary test, an ignition was observed at 281 °C.

 

Main Test

Based on results of the main test series, the lowest auto-ignition temperature was 269 °C.

 

Table2: Lowest temperatures at which an ignition occurred

Main test series

Lowest temperatures of an ignition

Highest temperatures without an ignition

Atmospheric Pressure

1

269 °C

266 °C

987.1 hPa

2

270 °C

267 °C

1000.5 hPa

3

270 °C

266 °C

999.6 hPa

The auto-ignition temperature rounded down to the nearest multiple of 5 °C was determined as 265 °C.

According to DIN EN 13463-1 the test item has to be assigned to temperature class T3 (maximum surface temperature / minimum auto-ignition temperature 200 °C).

Conclusions:
The auto-ignition temperature of the test item was determined to be 265 °C.
Executive summary:

A study was conducted according to Regulation (EC) No 440/2008 Part A.15, DIN 14522 (2005) and DIN 51794 (2003) to determine the auto-ignition temperature of the test substance. In a preliminary test the approximate 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 2 - 4 K until no ignition was observed. According to criteria laid down in Regulation EC No. 440/2008 method A.15 and DIN 51794 the auto-ignition temperature is the lowest value rounded down to a whole multiple of 5 °C. Therefore, the auto-ignition temperature was determined to be 265 °C at 987 -1000.5 hPa.

Description of key information

The auto-ignition temperature of the test item was determined to be 265 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
265 °C

Additional information

A study was conducted according to Regulation (EC) No 440/2008 Part A.15, DIN 14522 (2005) and DIN 51794 (2003) to determine the auto-ignition temperature of the test substance. In a preliminary test the approximate 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 2 - 4 K until no ignition was observed. According to criteria laid down in Regulation EC No. 440/2008 method A.15 and DIN 51794 the auto-ignition temperature is the lowest value rounded down to a whole multiple of 5 °C. Therefore, the auto-ignition temperature was determined to be 265 °C at 987 -1000.5 hPa.