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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
DIN EN 14522, Method P (Determination of the auto ignition temperature of gases and vapours)
Version / remarks:
It is not specified if method "P" or method "S" was employed.
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:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
GLP compliance:
no
Specific details on test material used for the study:
LOT: 21060301
Purity: 99.63%
Auto-ignition temperature:
247 °C
Atm. press.:
1 001.8 hPa
Remarks on result:
preliminary test
Remarks:
5 drops were added into the Erlenmeyer flask at each temperature.
Auto-ignition temperature:
226 °C
Atm. press.:
>= 1 001.8 - <= 1 003.4 hPa
Remarks on result:
other: DIN EN 14522: The auto-ignition temperature reduced by 1.5 % and rounded to the nearest integer temperature was determined as 226 °C.
Key result
Auto-ignition temperature:
225 °C
Atm. press.:
>= 1 001.8 - <= 1 003.4 hPa
Remarks on result:
other: Regulation (EC) No 440/2008 method A.15. and DIN 51794: The auto-ignition temperature rounded down to the nearest multiple of 5 °C was determined as 225 °C.

Table 1: Results of the preliminary test

























 Preliminary test
Temperature / °C223244247
Ignition / +/---+
 Atmospheric pressure: 1001.8 hPa

In the preliminary test, an ignition was observed at 247 °C. 


Table 2: Results of the main test





























Main test seriesLowest temperatures of an ignitionHighest temperatures of an igntitionAtmospheric pressure
1 (ZT2)2302281001.8
2 (ZT2)2292281001.8
3 (ZT3)2312291002.7 - 1003.4

Based on results of the main test series, the lowest auto-ignition temperature was 229 °C.


According to DIN EN 13463-1 the test item has to be assigned to temperature class T3 (see the following Table 3).


Table 3: Temperature classes

































Temperature classMaximum surface temperature / minimum auto ignition temperature [°C]
T1450
T2300
T3200
T4135
T5100
T685
Conclusions:
The test item 1,2,3,6-Tetrahydrobenzaldehyde has an auto-ignition temperature of 225 °C.
Executive summary:

The test item 1,2,3,6-Tetrahydrobenzaldehyde has an auto-ignition temperature of 225 °C according to Regulation (EC) No 440/2008 Method A.15. Auto-Ignition Temperature (Liquids and Gases) and DIN 51794 (2003): Testing of mineral oil hydrocarbons – Determination of Ignition Temperature.
It is noted here that according to ECHA guidance – Guidance on information requirements and chemical safety assessment; chapter R.7A: Endpoint specific guidance, July 2017 – the auto-ignition temperature for liquids is not used directly for classification and labeling according to Regulation (EC) No 1272/2008. However, it can be used in the chemical safety assessment in considering risks associated with processing the substance.
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).

Description of key information

The test item 1,2,3,6-Tetrahydrobenzaldehyde has an auto-ignition temperature of 225 °C according to Regulation (EC) No 440/2008 Method A.15. Auto-Ignition Temperature (Liquids and Gases) and DIN 51794 (2003): Testing of mineral oil hydrocarbons – Determination of Ignition Temperature.
It is noted here that according to ECHA guidance – Guidance on information requirements and chemical safety assessment; chapter R.7A: Endpoint specific guidance, July 2017 – the auto-ignition temperature for liquids is not used directly for classification and labeling according to Regulation (EC) No 1272/2008. However, it can be used in the chemical safety assessment in considering risks associated with processing the substance.
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).

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
225 °C

Additional information