7,7,9(or 7,9,9)-trimethyl-4,13-dioxo-3,14-dioxa-5,12-diazahexadecane-1,16-diyl bismethacrylate

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:

09 Jun - 24 Jun 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

GLP guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))

Version / remarks:

adopted in 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Mainz, Germany

Specific details on test material used for the study:

Storage conditions: room temperature (20 ± 5 °C), keep away from light

Auto-ignition temperature:

445 °C

Atm. press.:

99 800 Pa

Results
Pre-test
In this measurement the temperature was visually estimated. Ignition attempts are presented in Table 1.

Table 1 – Pre-test ignition attempts (atmospheric pressure of 99,900 Pa)

Time [hh:mm]	Temperature [°C]	Drops used [nr]	Ignition?	Ignition delay [s]	Observations
12:38	Ca.310	2	no	-	fuming
12:46	Ca. 332	2
12:52	Ca. 352	2
12:58	Ca. 375	2
13:03	Ca. 384	2
13:09	Ca. 400	2
13:19	Ca. 421	2
13:27	Ca. 439	2
13:42	Ca. 464	2	yes	instantly	Flame, pop, fuming

 

Main Study – 1^stTest Series
Results are shown in Table 2

Table 2 – Ignition attempts first test series (atmospheric pressure of 100,000 Pa)

Time [hh:mm]	Temperature [°C]	Drops used [nr]	Ignition?	Ignition delay [s]	Observations
13.50	465	2	yes	4	Pop, flame, fuming
13:59	460	2		20
14:05	455	2		5
14:12	450	2		6
14:21	445	2	no	-	fuming
14:28	445	5
14:38	445	10
14:59	445	15
15.08	447	15

 

The lowest value of the first test series is 450 °C.

Main Study – Determination of Lowest Value

Table 3 – Ignition attempts determination of lowest value (atmospheric pressure of 99,800 Pa)

Time [hh:mm]	Temperature [°C]	Drops used [nr]	Ignition?	Ignition delay [s]	Observations
09:02	460	2	yes	instantly	Pop, flame, fuming
09:10	455	2
09:23	450	2
09:36	445	2		10
09:52	440	2	no	-	fuming
09:58	440	5
10:05	440	10
10.13	440	15
10.24	442	15

 

The lowest value of the determination of lowest value is 445 °C.

Main Study – Repetition

Table 4 – Ignition attempts repetition (atmospheric pressure of 99,800 Pa)

Time [hh:mm]	Temperature [°C]	Drops used [nr]	Ignition?	Ignition delay [s]	Observations
13:27	445	2	yes	5	Flame, pop, fuming
13.36	450	2
13:42	445	2	no	-	Strong fuming
13:51	445	5
14:01	445	10
14:14	445	15
14:30	447	15

 

The lowest value of the repetition is 450 °C.

Results Summary
The lowest values recorded are shown in Table 5.

Table 5 – Lowest values main study

Experiment	Value [°C]
First test series	450
Determination of lowest value	445
Repetition	450

The lowest value of the auto ignition temperature is 445 °C. This was determined using the 2 drops test item. The test item showed auto ignition after 10 seconds.

Study Plan Deviations
Because the test item was too viscous, it was brought into the test vessel with a 2 mL one-way syringe instead of with a pipette.

The start temperature in experiments 2 and 3 of the main study was 10 K above the last ignition temperature instead of 5 K below.

Four thermos elements were used instead of two, to obtain a better detection of the ignition point.

 

Description of key information

445 °C at 998 hPa (EU Mehtod A.15.)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

445 °C