[No public or meaningful name is available]

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:

experimental dates: 12-15 October 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method with no deviation, and under GLP. The substance is considered to be adequately characterised, with isomers composition. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

Commission Regulation No 440/2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

DIN EN 14522, Method S (Determination of the auto ignition temperature of gases and vapours)

Version / remarks:

2005

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed on 15 Nov. 2018

Specific details on test material used for the study:

Storage conditions of test material: Stored refrigerated (2-8°C) in aluminium bottle. An injection of nitrogen conditions gas is performed into the bottle after each sampling to keep the test item under nitrogen atmosphere during the storage period.

Auto-ignition temperature:

240 °C

Atm. press.:

>= 968 - <= 978 hPa

First determination

The preselected auto-ignition temperature was set to 350°C.

Ignition occurred for a sample temperature of 274.2°C with an amount of 5 droplets for each test.

Then H-A1 program (steps 2 and 3) and H-A2 program (steps 4 to 7) were conducted.

For the first determination, H-A1 program was performed from 269°C using 5 droplets by decreasing temperature in 5°C steps as ignition occurred.

At 264°C, ignition occurred with 5 droplets.

At 259°C, ignition occurred with 5 droplets.

At 254°C, ignition occurred with 5 droplets.

At 249°C, ignition occurred with 5 droplets.

At 244°C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 5 and 2 droplets but no ignition occurred. Ignition occurred with 8 droplets.

At 239°C, ignition did not occur no matter the number of droplets.

Therefore, H-A2 program was used from 242°C using successively 8, 5, 2 and 11 droplets but no ignition occurred.

The last ignition occurred at 244°C using 8 droplets (ignition delay 85 sec) and corresponds to the first auto-ignition temperature.

Second determination

Temperature was then increased to the value obtained with pre-determination program (274°C) and H-A1 program was performed using 8 droplets. The same operatory mode as for the first determination was performed and the lowest auto-ignition was found at 244°C using 8 droplets (ignition delay 98 sec).

Third determination

It was performed as for the second one and a lowest auto-ignition temperature of 244°C with 8 droplets was found (ignition delay 117 sec).

As the three determinations did not differ by more than 2%, these results were considered as valid. The lowest value (244°C) was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) and rounded to the nearest 1 °C.

A final auto-ignition temperature of 240°C was obtained.

The atmospheric pressure was 978.0 hPa at the beginning of the test and 968.0 hPa at the end of the test.

Conclusions:

This parameter/method is not relevant for classification, however the information is useful regarding process safety and potential additional fire hazard.
No particular hazard is anticipated in normal conditions of storage.

Executive summary:

The auto-ignition temperature of the test substance was measured, under GLP, according to EU A15 guideline and DIN 14522 standard.

Three test series were performed, where different volumes of test substance were injected into a heated flask, until the lowest temperature at which ignition occurs was determined. The relevant parameters were recorded for the final result.

The lowest of the three value was retained, corrected for uncertainty standard and rounded to the nearest °C as described in DIN 14522, resulting in an autoignition temperature of 240°C.

Description of key information

No particular hazard is anticipated in normal conditions of storage.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

240 °C

Additional information

A fully reliable experimental study, conducted according to a recognized DIN/EU method and under GLP, is available. It is considered as a key study, and the result is retained as key data.

This parameter is not relevant for classification, however the information is useful regarding process safety and potential additional fire hazard.