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Physical & Chemical properties

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 2017-02-20 to 2017-08-31
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test material information:
Composition 1
Specific details on test material used for the study:
Batch No.: VPS9016001
Purity: 97.3 %
Key result
Auto-ignition temperature:
460 °C
Atm. press.:
>= 99 710 - <= 101 317 Pa

Table 1. Pre-test findings

Selected T

T Vessel

Drops used

Ignition?

Observations

°C

°C

5#

yes/no

 

300

201.3

5

no

-

300

222.4

5

no

-

300

246.7

5

no

smoke

300

268.1

5

no

smoke

300

290.9

5

no

smoke

300

314.0

5

no

smoke

300

339.9

5

no*

see below*

450

366.3

5

no

Smoke

450

375.7

5

no

Smoke

450

395.4

5

no

Smoke

450

418.1

5

no

Strong smoke

450

440.2

5

no

Strong smoke

450

462.8

5

no

Strong smoke

450

483.0

5

no

Strong smoke

450

502.3

5

no

Strong smoke

450

520.1

5

yes

Plop and flame

Ignition after 44 s

* The detector had detected the hot smoke as ignition.

Atmospheric pressure during the pre-test was100523Pa.

Table 2. First test series findings

Used program

Selected T*

T Vessel

Drops used

Ignition?

Observations

 

°C

°C

#

yes/no

 

H-A1

518

517.0

5

yes

Plop and flame

Ignition after 8 s

H-A1

513

513.3

5

yes

Plop and flame

Ignition after 9 s

H-A1

508

508.1

5

yes

Bang and flame

Ignition after 20 s

H-A1

503

503.1

5

yes

Bang and flame

Ignition after 8 s

H-A1

498

498.1

5

yes

Bang and flame

Ignition after 9 s

H-A1

493

493.4

5

no

Strong smoke

H-A1

493

493.6

9

yes

Bang and flame

Ignition after 10 s

H-A1

488

488.7

9

yes

Plop and flame

Ignition after 26 s

H-A1

483

483.0

9

no

Strong smoke

H-A1

483

483.3

5

no

Smoke

H-A1

483

483.3

13

yes

Plop and flame

Ignition after 12 s

H-A1

478

477.3

13

yes

Plop and flame

Ignition after 22 s

H-A1

473

472.9

13

no

Strong smoke

H-A1

473

472.6

9

no

Strong smoke

H-A1

473

472.8

5

no

Smoke

H-A1

473

472.8

17

yes

Plop and flame

Ignition after 12 s

H-A1

468

468.8

17

no

Strong smoke

H-A1

468

468.7

13

no

Strong smoke

H-A1

468

468.7

9

no

Strong smoke

H-A1

468

468.3

5

no

Strong smoke

H-A2

471

470.8

17

yes

Plop and flame

Ignition after 65 s

H-A2

469

469.0

17

no

Strong smoke

H-A2

469

469.3

13

no

Strong smoke

H-A2

469

469.0

9

no

Strong smoke

H-A2

469

469.0

5

no

Strong smoke

* The selected temperature was suggested automatically by the ZPA3.

Lowest value of the first test series is 471 °C.

Table 3. Second test series findings

Used program

Selected T*

T Vessel

Drops used

Ignition?

Observations

 

°C

°C

#

yes/no

 

H-A1

478

477.5

12

yes

Plop and flame

Ignition after 14 s

H-A1

473

472.8

12

yes

Plop and flame

Ignition after 11 s

H-A1

468

467.4

12

no

Strong smoke

H-A1

468

468.0

8

no

Strong smoke

H-A1

468

467.7

4

no

Strong smoke

H-A1

468

467.4

16

yes

Plop and flame

Ignition after 30 s

H-A1

463

462.8

16

yes

Plop and flame

Ignition after 24 s

H-A1

458

458.3

16

no

Strong smoke

H-A1

458

458.2

12

no

Strong smoke

H-A1

458

457.0

8

no

Strong smoke

H-A1

458

457.7

4

no

Smoke

H-A1

458

457.5

20

no

Strong smoke

H-A2

461

460.6

16

no

Strong smoke

H-A2

461

461.0

12

no

Strong smoke

H-A2

461

461.3

8

no

Strong smoke

H-A2

461

461.3

4

no

Smoke

H-A2

461

461.3

20

no

Strong smoke

* The selected temperature was suggested automatically by the ZPA3.

Lowest value of the second test series is 463 °C.

Table 4. Third test series findings

Used program

Selected T*

T Vessel

Drops used

Ignition?

Observations

 

°C

°C

#

yes/no

 

H-A1

468

467.5

12

no

Strong smoke

H-A1

468

467.5

8

no

Strong smoke

H-A1

468

468.0

4

no

Strong smoke

H-A1

468

468.3

16

no

Strong smoke

H-A1

468

468.2

20

yes

Plop and flame

Ignition after 31 s

H-A1

463

463.4

20

no

Strong smoke

H-A1

463

462.0

16

no

Strong smoke

H-A1

463

462.1

12

no

Strong smoke

H-A1

463

462.0

8

no

Strong smoke

H-A1

463

462.1

4

no

Smoke

H-A2

466

465.7

20

yes

Plop and flame

Ignition after 13 s

H-A2

464

463.7

20

yes

Plop and flame

Ignition after 19 s

H-A2

462

461.6

20

no

Strong smoke

H-A2

462

461.6

16

no

Strong smoke

H-A2

462

462.3

12

no

Strong smoke

H-A2

462

461.6

8

no

Strong smoke

H-A2

462

461.8

4

no

Strong smoke

* The selected temperature was suggested automatically by the ZPA3.

Lowest value of the third test series is 464 °C.

Table 5. Lowest values of all test series

Experiment

Value

Ignition delay

Drops used

First test series

471 °C

65 s

17

Second test series

463 °C

24 s

16

Third test series

464 °C

19 s

20

The lowest value of the auto-ignition temperature is 463 °C. This value was determined using 16 drops test item. The test item showed auto-ignition after 24 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 460 °C.

Conclusions:
The auto-ignition temperature of the test item was determined to be 460 °C.
Executive summary:

A study was conducted according to Regulation (EC) No 440/2008 Part A.15 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 - 5 °C 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 460 °C at 997 -1013 hPa.

Description of key information

The auto-ignition temperature of the test item was determined to be 460 °C at 1013 hPa.

Key value for chemical safety assessment

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

Additional information

A study was conducted according to Regulation (EC) No 440/2008 Part A.15 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 - 5 °C 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 460 °C at 997 -1013 hPa.