1,3-diiodopropane

Auto flammability

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