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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 November 2020 - 25 November 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Well documented study performed according to EU A.15 guideline, under GLP and without deviation
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
2018-11-15
Auto-ignition temperature:
ca. 219 °C
Atm. press.:
ca. 972 hPa
Remarks on result:
other: First determination
Auto-ignition temperature:
ca. 217 °C
Remarks on result:
other: Second determination
Auto-ignition temperature:
ca. 219 °C
Atm. press.:
ca. 973 hPa
Remarks on result:
other: Third determination
Key result
Auto-ignition temperature:
ca. 214 °C
Remarks on result:
other: Final value

Results:


First determination:


Step1: The preselected auto-ignition temperature was set to 150°C.


Firstly, VORB program was used with an amount of 5 droplets for each test.


Ignition occured for a sample temperature of 238.8°C.


Step 2: Then H-A1 program was conducted. 


For the first determination, H-A1 program was performed from 234°C using 5 droplets by decreasing temperature in 5°C steps as ignition occured.


Step 3: At 224°C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 2 and 8 droplets. Ignition occurred using 8 droplets and so the temperature was decreased again in 5°C steps till 214°C where ignition did not occur whatever the amount of droplets. The last ignition occured at 219°C using 8 droplets. 


Step 4 to 6: H-A2 program was then used from 217°C using 8 but no ignition occurred whatever the amount of droplets. The last ignition ocurred at 219°C using 8 droplets. 


Step 7: The last ignition occured at 219°C using 8 droplets, ignition time lag was  37 seconds  and correspond to the first auto-ignition temperature (LASTIP on raw data). 


Second determination:


For the second determination, temperature was then increased to the value obtained with VORB program (239°C) and H-A1 program was performed using 8 droplets. The same operatory mode as for the first determination was performed and the lowest auto-ignition was found at 217 °C using 11 droplets, ignition time lag was 30 seconds.


Third determination:


A third determination was performed as for the second one and a lowest auto-ignition temperature of 219 °C with 8 droplets (ignition time lag 34 seconds) was found.


The lowest value (217 °C obtained during the second determination) was reduced by the absolute deviation calculated using the reproducibility value (1.5 % relative) and rounded up to the nearest 1°C.


A final auto-ignition temperature of 219°C was obtained.


The atmospheric pressure was 972.0 hPa at the beginning of the test and 973.0 hPa at the end of the test.


No fume or noise was observed throughout the test. 


The following table summarised the protocol and the results obtained:


 














































































































































































































































DeterminationProgramTemperatureDroplets
25811
/VORB70.8 -  
93.4 -  
117.5 -  
140.7 -  
165.7 -  
187.7 -  
213.2 -  
235.8 -  
238.8 X  
1H-A1234 X  
229 X  
224--X 
219  X 
214----
H-A2217----
2H-A1239  X 
234  X 
229  X 
224---X
219   X
214----
H-A2217   X
215----
3H-A1239   X
234   X
229   X
224   X
219  X-
214----
H-A2217----

With  X: auto-ignition


         - : no auto-ignition

Conclusions:
The final auto-ignition temperature was determinated to be 214°C.
Executive summary:

A study was performed to determine the auto-ignition Temperature of the test item (+)-CAMPHOLENIC ALDEHYDE. The method followed was designed to be compliant with the Commission Regulation (EC) No 440/2008, Method A.15: ''Auto-ignition Temperature (Liquids and gases)''.


In this method, the auto-ignition temperature of the test item was determined by varying the temperature of the test vessel and the amount of test substance. The lowest temperature where ignition occurs was retained and, in order to take into account all uncertainties (calibration, temperature measuring system, amount of substance etc.), this lowest value was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.


One trial was conducted. The preselected auto-ignition temperature was set to 150 °C and three auto-ignition temperature were recorded (recorded as LASTIP on raw data): 219°C, 217°C and 219°C.


As these three auto-ignition temperature obtained with the determination program did not differ by more than 2% from the mean, the results were validated and the lowest value (217°C) was automatically reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) as described in DIN EN 14522:2005.


This value was rounded to the nearest 1°C and a final auto-ignition temperature of 214°C was obtained.


The atmospheric pressure was 972 hPa at the beginning of the test and 973 hPa at the end of the test.


The final auto-ignition temperature was determined to be 214°C.

Description of key information

The final auto-ignition temperature was determined to be 214°C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
214 °C

Additional information

A well performed study was conducted according to EU A.15 guideline and under GLP to determine the self-ignition temperature. The result was considered as reliable without restriction.