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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:
Januray 24,2017 - January 26, 2017
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
GLP compliance:
yes (incl. QA statement)
Key result
Auto-ignition temperature:
ca. 460 °C
Atm. press.:
ca. 1 028 hPa

Table No.1: Results of determination of initial temperature – T2

Temperature of oven [°C]

 

V [quantity of drops]

 

Result of test

 

Corresponding delay time [s]

 

400

 

 

5

 

-

-

420

-

-

440

-

-

460

-

-

480

+

4

(+) – yes, (-) – no

T2= 480ºC, After including a thermometer deviations: T2=478ºC

Table No.2 : Results of determination of the lowest temperature from the first series – T3

Temperature of oven [°C]

 

V [quantity of drops]

 

Result of test

 

Corresponding delay time [s]

 

475

5

+

4

470

5

+

4

465

5

+

4

460

5

-

-

460

6

-

-

460

7

-

-

460

8

-

-

460

9

-

-

460

10

-

-

(+) – yes, (-) – no

T3 = 465 °C, After including a thermometer deviation: T3 = 463 °C

Table No.3: Results of determination of the lowest temperature from the first series – T4

Temperature of oven [°C]

 

V [quantity of drops]

 

Result of test

 

Corresponding delay time [s]

 

463

5

+

5

461

5

-

-

461

6

-

-

461

7

-

-

461

8

-

-

461

9

-

-

461

10

-

-

(+) – yes, (-) – no

T4 = 463 °C, After including a thermometer deviation: T4 = 461 °C

Table No.4: Results of determination of the final temperature – T5

Temperature of oven [°C]

 

V [quantity of drops]

 

Result of test

 

Corresponding delay time [s]

 

468

5

+

4

466

5

+

5

464

5

-

-

464

6

-

-

464

7

+

5

462

7

-

-

462

8

-

-

462

9

-

-

462

10

-

-

(+) – yes, (-) – no

T5 = 464 °C After including a thermometer deviation: T5 = 462 °C

Table No5: Results of repeating of determination – T6

Temperature of oven [°C]

 

V [quantity of drops]

 

Result of test

 

Corresponding delay time [s]

 

468

5

+

4

466

5

-

-

466

6

+

4

464

6

-

-

464

7

-

-

464

8

+

5

462

8

-

-

462

9

+

6

460

9

-

-

460

10

-

-

(+) – yes, (-) – no

T6 = 462 °C, After including a thermometer deviation: T6 = 460 °C

Table No.6: Summary of the results of AUTO-IGNITION TEMPERATURE

Stage of determination

 

Auto-ignition temperature [°C]

 

V [quantity of drops]

 

Corresponding delay time [s]

 

Ignition temperature position for main determination (T2)

 

478

5

4

The lowest value from first series of tests (T4)

 

461

5

5

The lowest value from main determination (T5)

 

462

7

5

The lowest value from first repeating (T6)

 

460

9

6

The lowest experimental value of ignition temperature

 

460

9

6

Auto-ignition temperature according to DIN 51794: 2003-05

 

460

-

-

atmospheric pressure: 1016 ÷ 1028 hPa

Conclusions:
The auto-ignition temperature of test item is 460ºC at the atmospheric pressure 1028 hPa.
Executive summary:

In accordance with GLP study and DIN 51794:2003-05(Corresponded with EU method A.15) the Auto-ignition temperature was tested. Test item was tested as supplied. The T1 temperature was determined in the preliminary test and it was used to determine initial temperature T2 for the main test .The main test consisted from 3 stages where the lowest temperatures T3,T4 and T5 were determined by changing temperatures and the quantity of the sample for one drop. After each positive/negative test the temperature of the ignition chamber was decreased/increased until it reached the exact temperature at which for the first time there was ignition. Then tests of ignition were performed at this temperature by increasing each time the amount of sample used for 1 drop. Before each introduction of a new portion of the sample, ignition chamber was cleaned using compressed ait.The day 25.01.2017 temperature T5 was determined by using clean ignition chamber. The final auto-ignition temperature was identify the next day using the temperature T5 as the start temperature and with a new ignition chamber. The final auto-ignition temperature of test item was determinedas the temperature T6 =460 °C.

Description of key information

Key study: GLP study, EU A.15 method, DIN 51794:2003-05. The auto-ignition temperature of test item is 460 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
460 °C

Additional information

Key study: In accordance with GLP study and DIN 51794:2003 (corresponded with EU method A.15) the Auto-ignition temperature was tested. Test item was tested as supplied. The T1 temperature was determined in the preliminary test and it was used to determine initial temperature T2 for the main test .The main test consisted from 3 stages where the lowest temperatures T3,T4 and T5 were determined by changing temperatures and the quantity of the sample. After each positive/negative test the temperature of the ignition chamber was decreased/increased until it reached the exact temperature at which for the first time there was ignition. At this temperature the tests of ignition were performed by increasing each time the amount of sample used for 1 drop. Before each introduction of a new portion of the sample, ignition chamber was cleaned using compressed air. Temperature T5 was determined by using clean ignition chamber and this temperature was used the next day as start temperature for the determination of the final auto-ignition temperature.The final auto-ignition temperature of test item was determined temperature T6 =460 °C.