Registration Dossier

Diss Factsheets

Physical & Chemical properties

Auto flammability

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Jan. - Apr. 2020
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:
May 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Auto-ignition temperature:
445 °C
Atm. press.:
1 001 mBar

To determine viscosity of the test item it was visually compared with the standard liquid viscosity (50 mPa*s). The viscosity of the test item was below 50 mPa*s.

Results of the pre-determination:

Selected Temp. [°C]

Temp. Vessel [°C]

# Drops used

Ignition? [yes/no]

Observations

200

200.3

5

no

-

300

300.4

5

no

Smoke

400

399.9

5

no

Purple smoke

500

500.1

5

yes

Purple flame and smoke

 

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

Selected Temp. [°C]

Temp. Vessel [°C]

# Drops used

Ignition? [yes/no]

Observations

400.0

400.4

5

no

Purple smoke

420.0

420.5

5

no

Purple smoke

440.0

440.2

5

no

Purple smoke

460.0

460.4

5

yes

Flame and plop

Result given by the instrument

-

460.58

5

yes

Flame and plop

Theselected temperature was selected at the Zündwertprüfer 10-212-000 corresponding to an initial oven temperature of 400 °C. Using a constant heating rate, the subsequent ignition trials were conducted every 20 ± 5 °C. Atmospheric pressure during the pre-test was993.8 mbar.

 

The ignition attempts of the first test series of the main determination are presented in the following table:

Selected Temp. [°C]

Temp. Vessel [°C]

# Drops used

Ignition? [yes/no]

Observations

465.6

465.7

5

yes

Flame and plop

460.6

460.8

5

yes

Flame and plop

455.6

455.5

5

yes

Flame and plop

450.6

450.6

5

no

smoke

450.6

450.9

7

no

smoke

450.6

450.8

9

no

smoke

450.6

450.4

13

no

smoke

453.5

453.5

5

yes

Flame and plop

451.5

451.4

5

yes

Flame and plop

449.5

449.6

5

no

smoke

449.5

449.7

7

no

smoke

449.5

449.3

9

no

smoke

449.5

449.5

13

no

smoke

Result given by the instrument

-

451.45

5

Yes, after 12 seconds

Flame and plop

 

The ignition trials were conducted at an atmospheric pressure during the trials of 1001.0 mbar. Lowest value of the first test series is 451.45 °C, the drops, which needed, are 5 and the time until the ignition was detected, are 12 seconds.

 

The ignition attempts of the second test series of the main determination are presented in the following table:

Selected Temp. [°C]

Temp. Vessel [°C]

# Drops used

Ignition? [yes/no]

Observations

471.5

471.4

5

yes

plop

466.5

466.7

5

yes

plop

461.5

461.7

5

yes

plop

456.5

456.2

5

yes

plop

451.5

451.3

5

yes

plop

446.5

446.4

5

no

smoke

446.5

446.7

7

no

smoke

446.5

446.2

9

no

smoke

446.5

446.4

13

no

smoke

449.5

449.4

5

no

smoke

449.5

449.7

7

no

smoke

449.5

449.1

9

no

smoke

449.5

449.4

13

no

smoke

Result given by the instrument

-

451.45

5

Yes, after 10 seconds

plop

The ignition trials were conductedat an atmospheric pressure during the trials of 1000.2 mbar. Lowest value of the second test series is 451.45 °C, the drops, which needed, are 5 and the time until the ignition was detected, are 10 seconds.

 

The ignition attempts of the third test series of the main determination are presented in the following table.

Selected Temp. [°C]

Temp. Vessel [°C]

# Drops used

Ignition? [yes/no]

Observations

471.5

471.0

5

yes

Flame and plop

466.5

466.6

5

yes

Flame and plop

461.5

461.5

5

yes

Flame and plop

456.5

456.7

5

yes

Flame and plop

451.5

451.8

5

yes

Flame and plop

446.5

446.4

5

no

smoke

446.5

446.5

7

no

smoke

446.5

446.7

9

no

smoke

446.5

446.6

13

no

smoke

449.5

449.6

5

yes

Flame and plop

447.5

447.8

5

yes

Flame and plop

445.5

445.7

5

no

smoke

445.5

445.5

7

no

smoke

445.5

445.8

9

no

smoke

445.5

445.6

13

no

smoke

Result given by the instrument

-

447.84

5

Yes, after 15 seconds

Flame and plop

The ignition trials were conductedat an atmospheric pressure during the trials of 1005.9 mbar

Lowest value of the third test series is 447.84 °C, the drops, which needed, are 5 and the time until the ignition was detected, are 15 seconds.

 

Result and Validity

The requirements for repeatability of the DIN standard are stated as follows: Three lowest values of the main test have to lie within a range of 5 °C (if auto ignition temperature is below 300 °C) respectively 10 °C (if auto ignition temperature is above 300 °C).

The following lowest values were recorded:

Experiment

Value (rounded to integer)

Ignition delay

Drops used

First test series

451 °C

12 sec

5

Second test series

451 °C

10 sec

5

Third test series

448 °C

15 sec

5

 

The lowest value of the auto ignition temperature is 448 °C. This value was determined using 5 drops test item. The test item showed auto ignition after 15 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 445 °C.

Validity

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

Auto ignition temp.

Range

> 300 °C

difference between three values of the main test max. 10 °C

The three lowest values of the main test lay within a range of 10 °C (as required for auto-ignition temperatures above 300 °C). The largest difference between measuredignitiontemperatures was 3 °C. Thus, the test is considered valid.

Conclusions:
For 1,3-diiodopropane an auto-ignition temperature of 445 °C was determined, experimentally.
Executive summary:

The auto ignition temperature was determined in three independent determinations. A lowest value of the main test of 448 °C was found. Therefore, the auto-ignition temperature according to EU A.15 (rounded down to a whole multiple of 5 °C) of 1,3-Diiodopropane is stated as 445 °C.

Description of key information

For 1,3-diiodopropane an auto-ignition temperature of 445 °C was determined, experimentally.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
445 °C

Additional information