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Auto flammability

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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 02 to 04 November 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method. The substance is considered to be adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to
Guideline:
other: DIN EN 14522
Version / remarks:
Determination of the auto ignition temperature of gases and vapours, adopted December, 2005.
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. certificate)
Remarks:
inspected on 1, 2 and 3 July 2014 / signed on 5 Mars 2015
Key result
Auto-ignition temperature:
251 °C
Atm. press.:
>= 974 - <= 979 hPa

Results

First trial

The preselected auto-ignition temperature was set to 150°C but no ignition occurred during this trial.

 

Second trial

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

 

Firstly,VORB program was used with an amount of 5 droplets for each test.

Ignition occurred for a sample temperature of 295.4°C.

 

Then H-A1 program and H-A2 program were conducted.

For the first determination, H-A1 program was performed from 290°C using 5 droplets by decreasing temperature in 5°C steps as ignition occurred.

At 265°C, ignition did not occur so the amount of test item that is injected was modified. Tests were performed with 2 and 8 droplets.

Ignition occurred using 8 droplets and so the temperature was decreased again in 5°C steps.

Tests were then performed continuing to vary the amount of droplets till no ignition occurs whatever the amount of droplets. The last ignition occurred at 260°C using 8 droplets.

 

H-A2 program was then used from 258°C using 8 droplets and the test were continued, in varying the amount of droplets and decreasing the temperature in 2°C steps.

The last ignition occurred at 258°C using 11 droplets and correspond to the first auto-ignition temperature.

 

For the second determination, temperature was then increased to the value obtained with VORB program (295°C) and H-A1 program was performed using 11 droplets. The same operatory mode as for the first determination was performed and the lowest auto-ignition was found at 255°C using 11 droplets.

A third determination was performed as for the second one and a lowest auto-ignition temperature of 255°C with 11 droplets was found.

The lowest value (255°C) was reduced by the absolute deviation calculated using the reproducibility value (1.5% relative) and rounded up to the next 1 °C.

 

A final auto-ignition temperature of 251°C was obtained.

 

The atmospheric pressure was 979 hPa at the beginning of the test and 974 hPa at the end of the test.

The following table summarised the protocol and the results obtained:

 

Determination

Program

Temperature

(°C)

Droplets

2

5

8

11

/

VORB

272.6

 

-

 

 

294.4

 

-

 

 

295.4

 

X

 

 

1

H-A1

290

 

X

 

 

285

 

X

 

 

280

 

X

 

 

275

 

X

 

 

270

 

X

 

 

265

-

-

X

 

260

 

 

X

 

255

-

-

-

-

H-A2

258

-

-

-

X

256

-

-

-

-

2

H-A1

295

 

 

 

X

290

 

 

 

X

285

 

 

 

X

280

 

 

 

X

275

 

 

 

X

270

 

 

 

X

265

 

 

 

X

260

 

 

 

X

255

 

 

 

X

250

-

-

-

-

H-A2

253

-

-

-

-

3

H-A1

295

 

 

 

X

290

 

 

 

X

285

 

 

 

X

280

 

 

 

X

275

 

 

 

X

270

 

 

 

X

265

 

 

 

X

260

 

 

 

X

255

 

 

 

X

250

-

-

-

-

H-A2

253

-

-

-

-

 

X : auto-ignition

- : no auto-ignition

Validity and discussion

Three lowest auto-ignition temperatures were recorded as 258°C, 255°C and 255°C respectively using 11 droplets.

 

As these three temperatures did not differ by more than 2%, these results were considered as valid and the lowest value (255°C) was retained. As described in DIN EN 14522:2005, the final auto-ignition temperature was obtained in reducing the retained value by the absolute deviation calculated using the reproducibility value (1.5% relative) andin rounding it up to the next 1 °C.

The final auto-ignition temperature was found at 251°C between 974 and 979 hPa.

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

The study was conducted under GLP according to EU-Method A.15 and DIN EN 14522:2005.

Two trials were conducted. In the first one, the preselected auto-ignition temperature was set to 150°C but no ignition occurred and the test stopped automatically. In the second one, the preselected auto-ignition temperature was set to 350°C and three auto-ignition temperature were recorded: 258°C, 255°C and 255°C, under atmospheric pressure between 974 and 979 hPa. The lowest value (255°C) was reduced by the absolute deviation and rounded up to the next 1 °C.

The final auto-ignition temperature was 251°C.

Description of key information

Auto-ignition temperature = 251°C between 979 and 974 hPa.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
251 °C

Additional information

A reliable experimental study, conducted according to a recognized EC method and under GLP, is available. It is considered as a key study. The result is retained as key data for purpose of CSA.

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