2,2'-[oxybis(2,1-ethanediyloxy)]bisacetic acid

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:

from 2017-10-09 to 2018

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

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

Batch no.: 03/2016_T_R_JM

Key result

Auto-ignition temperature:

410 °C

Atm. press.:

>= 99 888 - <= 100 801 Pa

Pre-Test

Table 1. Pre-test ignition attempts

Selected T	T Vessel	Drops used	Ignition?	Observations
°C	°C	#	yes/no
300	200.1	5	no	smoke
300	222.3	5	no	smoke
300	241.9	5	no	smoke
300	262.5	5	no	smoke
300	285.1	5	no	smoke
300	308.8	5	no	smoke
300	334.5	5	no	smoke
300	355.5	5	no	smoke
300	377.6	5	no	smoke
300	399.7	5	no	smoke
400	414.9	5	no	smoke
400	419.1	5	yes	Flame and plop, ignition after 34s

The temperature was selected at the ZPA3 corresponding to an initial oven temperature of 200 °C. As the test item showed no ignition at 399.7 °C, a higher temperature was selected for the subsequent ignition trials corresponding to a new initial oven temperature of 400 °C. Using a constant heating rate, the subsequent ignition trials were conducted every 20 ± 5 K, except the last ignition trial where it was below 20 ± 5 K. Atmospheric pressure during the pre-test was 100454 Pa.

 

First test series

Table 2. First test series ignition attempts

Used program	Selected T	T Vessel	Drops used	Ignition?	Observations
	°C	°C	#	yes/no
H-A1	415	414.5	5	yes	Flame and plop, ignition after 20 s
H-A1	410	409.8	5	no	Smoke
H-A1	410	409.9	9	yes	Flame and plop, Ignition after 31 s
H-A1	405	404.8	9	no	Smoke
H-A1	405	404.9	5	no	Smoke
H-A1	405	404.7	13	no	Smoke
H-A1	405	405.2	17	no	Smoke
H-A2	408	407.7	9	no	Smoke
H-A2	408	408.1	5	no	Smoke
H-A2	408	408.3	13	no	Smoke
H-A2	408	408.2	17	no	Smoke

The first ignition trial was conducted at atmospheric pressure of 100454 Pa, and the other ones at atmospheric pressure of 99888 Pa. Lowest value of the first test series was 410 °C.

 

Second test series

Table 3. Second test series ignition attempts

Used program	Selected T	T Vessel	Drops used	Ignition?	Observations
	°C	°C	#	yes/no
H-A1	415	414.7	12	yes	Flame and plop, ignition after 143 s
H-A1	410	409.8	12	no	Smoke
H-A1	410	410.1	8	no	Smoke
H-A1	410	409.9	4	no	Smoke
H-A1	410	410.1	16	no	Smoke
H-A1	410	409.9	20	no	Smoke
H-A2	413	413.1	12	no	Smoke
H-A2	413	413.4	8	no	Smoke
H-A2	413	413.2	4	no	Smoke
H-A2	413	413.1	16	no	Smoke
H-A2	413	413.0	20	no	Smoke

The first ignition trial was conducted at atmospheric pressure of 100219 Pa, and the other ones at atmospheric pressure of 100653 Pa. Lowest value of the second test series was 415 °C.

 

Third test series

Table 4. Third test series ignition attempts

Used program	Selected T	T Vessel	Drops used	Ignition?	Observations
	°C	°C	#	yes/no
H-A1	420	420.4	12	yes	Flame and plop, Ignition after 28 s
H-A1	415	414.9	12	no	Smoke
H-A1	415	414.6	8	yes	Flame and plop, Ignition after 63 s
H-A1	410	409.9	8	yes	Flame and plop, Ignition after 44 s
H-A1	405	404.9	8	no	Smoke
H-A1	405	404.6	4	no	Smoke
H-A1	405	405.1	12	no	Smoke
H-A1	405	404.8	16	no	Smoke
H-A1	405	405.1	20	no	Smoke
H-A2	408	407.6	8	no	Smoke
H-A2	408	408.4	4	no	Smoke
H-A2	408	408.4	12	no	Smoke
H-A2	408	408.3	16	no	Smoke
H-A2	408	408.1	20	no	Smoke

The first five ignition trials were conducted at atmospheric pressure of 99940 Pa, the next five ignition trials were conducted at atmospheric pressure of 100801 Pa, and the other ones at atmospheric pressure of 100532 Pa. Lowest value of the third test series was 410 °C.

 

Results

Table 5. Lowest values of the main test

Experiment	Value	Ignition delay	Drops used
First test series	410 °C	31 s	9
Second test series	415 °C	143 s	12
Third test series	410 °C	44 s	8

 

The lowest value of the auto-ignition temperature was 410 °C. This value was determined using 9 and 8 drops of the test item. The test item showed auto-ignition after 31 and 44 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 was stated as 410 °C.

Conclusions:

The auto-ignition temperature of the test item was determined to be 410 °C.

Executive summary:

A study was conducted according to Regulation (EC) No 440/2008 Part A.15 to determine the auto-ignition temperature of the test item. 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 5 °C until no ignition was observed anymore. Then the amount of the test item was varied until further ignition occured. 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 410 °C at 999 -1008 hPa.

Description of key information

The auto-ignition temperature of the test item was determined to be 410 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

410 °C

Additional information

A study was conducted according to Regulation (EC) No 440/2008 Part A.15 to determine the auto-ignition temperature of the test item. 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 5 °C until no ignition was observed anymore. Then the amount of the test item was varied until further ignition occured. 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 410 °C at 999 -1008 hPa.