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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013-03-14 to 2013-03-22
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))
Version / remarks:
dated 31 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: DIN 51794
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Key result
Auto-ignition temperature:
160 °C
Atm. press.:
1 013.25 hPa

Pre-Determination

The ignition attempts of the pre-determination program are presented in the following table.

Ignition attempts pre-test

Selected T*

T Vessel

Drops used

Ignition?

Observations

°C

°C

#

yes/no

 

300

200.2

5

yes

Ignition after 35 s, flame and plop

*The temperature was selected at the ZPA3 corresponding to an initial oven temperature of 200 °C. Using a constant heating rate, the subsequent ignition trials were conducted every 20 ± 5 K

 

Main Study

The requirements for repeatability of the DIN 51794 standard are stated as follows: Three lowest values of the main study have to lie within a range of 10 K (if auto-ignition temperature is below 300 °C) respectively 20 K (if auto-ignition temperature is above 300 °C).

The following lowest values were recorded:

Lowest Values Main Study

Experiment

Value

Ignition delay

Drops used

First Experiment

172 °C

17 s

12

Second Experiment

162 °C

264 s

20

Third Experiment

172 °C

44 s

12

 

The lowest value of the auto-ignition temperature is 162 °C. This value was determined using 20 drops test item. The test item showed auto-ignition after 264 seconds.

The auto-ignition temperature (result of determination) is the lowest value from the lowest values of the three experiments, rounded down to a whole multiple of 5 °C. Therefore, the auto-ignition temperature is stated as 160 °C.

 

Validity

In the DIN 51794, the following limits are applied to the range of lowest values which may be used for evaluation:

Acceptable ranges

Auto ignition temp.

Range

< 300 °C

difference between three values of the main study max. 10 K

> 300 °C

difference between three values of the main study max. 20 K

 

The three lowest values of the main study lay within a range of 10 K (as required for auto-ignition temperatures below 300 °C). The largest difference between measured ignition temperatures was 10 K.

Conclusions:
The auto-ignition temperature of Aldehyde M was determined to be 160 °C at 1013.25 hPa.
Executive summary:

A study was to determine the auto-ignition temperature of Aldehyde M according to Regulation (EC) No 440/2008 method A.15 and DIN 51794 Three independent determinations were conducted. The auto-ignition temperature was determined to be 162 °C as lowest value of three determinations. According to the criteria as laid down in DIN 51794 the auto-ignition temperature is the lowest value from the lowest values of the three experiments, rounded down to a whole multiple of 5 °C. Therefore, the auto-ignition temperature is stated as 160 °C. The three lowest values of the main study lay within a range of 10 K. No observations were made which might cause doubts concerning the validity of the study outcome. Thus, the validation criteria were fulfilled.

Description of key information

The auto-ignition temperature of Aldehyde M was determined to be 160 °C at 1013.25 hPa.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
160 °C

Additional information

A study was to determine the auto-ignition temperature of Aldehyde M according to Regulation (EC) No 440/2008 method A.15 and DIN 51794 Three independent determinations were conducted. The auto-ignition temperature was determined to be 162 °C as lowest value of three determinations. According to the criteria as laid down in DIN 51794 the auto-ignition temperature is the lowest value from the lowest values of the three experiments, rounded down to a whole multiple of 5 °C. Therefore, the auto-ignition temperature is stated as 160 °C. The three lowest values of the main study lay within a range of 10 K. No observations were made which might cause doubts concerning the validity of the study outcome. Thus, the validation criteria were fulfilled.