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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:
24 November 2015 to 9 September 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to
Guideline:
ASTM E659 (Standard test method for autoignition temperature of liquid chemicals)
Version / remarks:
ASTM-E 659-78
Deviations:
no
GLP compliance:
yes (incl. certificate)
Key result
Auto-ignition temperature:
332 °C
Atm. press.:
98.9 kPa

The auto-ignition temperature of the test material was found to be 332 ± 5 °C. The atmospheric pressure at the time of testing was 98.9 kPa.

Table 1: Auto-ignition Test Results

Injection Volume

(µL)

Temperature

(°C)

Runtime

(seconds)

Ignition Time

(seconds)

Observations

100

402

184

0

Three ignitions and white fumes evolved

100

302

134

0

One ignition and white fumes evolved

100

210

298

N/A

No ignition and white fumes evolved

100

227

300

N/A

No ignition and white fumes evolved

100

248

302

N/A

No ignition and white fumes evolved

100

266

312

N/A

No ignition and white fumes evolved

100

286

298

N/A

No ignition and white fumes evolved

100

292

304

N/A

No ignition and white fumes evolved

100

303

294

N/A

No ignition and white fumes evolved

100

321

294

N/A

No ignition and white fumes evolved

100

338

172

12

One ignition and white fumes evolved

100

332

168

6

One ignition and white fumes evolved

100

327

292

N/A

No ignition and white fumes evolved

500

326

312

N/A

No ignition and white fumes evolved

1000

327

308

N/A

No ignition and white fumes evolved

N/A = no ignition

Conclusions:
Under the conditions of the study, the auto-ignition temperature of the test material was determined to be 332 ± 5 °C.
Executive summary:

The auto flammability of the test material was investigated in a study which was performed under GLP conditions and in accordance with the standardised guidelines EU Method A.15 and ASTM-E 659-78.

The apparatus consisted of an insulated, round bottomed, wide necked flask contained within an oven. A recording thermocouple, coupled to a chart recorder, was fitted to monitor the temperature of the flask interior. The required volume (initially 100 µL) of test substance was injected as droplets with a syringe into the centre of the flask so that the operation was complete in about two seconds, taking care to avoid wetting the walls of the flask during injection. The syringe was then withdrawn and the chart recorder started. The time when any flash or flame was observed was read from the chart trace, or the test was run for at least five minutes. The procedure was repeated at different temperatures and with different sample volumes until the minimum value of the ignition temperature was obtained. Between each test, the flask was flushed completely with clean dry nitrogen, and after flushing, a sufficient time interval was allowed before the next sample was injected to ensure that the flask contents re-equilibrated with air, and were stabilised at the desired temperature. The tests were made in appropriate temperature steps until the lowest temperature at when ignition occurs had been determined. The atmospheric pressure at the time of testing was 98.9 kPa.

Under the conditions of the study, the auto-ignition temperature of the test material was determined to be 332 ± 5 °C.

Description of key information

Under the conditions of the study, the auto-ignition temperature of the test material was determined to be 332 ± 5 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
332 °C

Additional information

The auto flammability of the test material was investigated in a study which was performed under GLP conditions and in accordance with the standardised guidelines EU method A.15 and ASTM-E 659-78. The study was assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al. (1997).

The apparatus consisted of an insulated, round bottomed, wide necked flask contained within an oven. A recording thermocouple, coupled to a chart recorder, was fitted to monitor the temperature of the flask interior. The required volume (initially 100 µL) of test substance was injected as droplets with a syringe into the centre of the flask so that the operation was complete in about two seconds, taking care to avoid wetting the walls of the flask during injection. The syringe was then withdrawn and the chart recorder started. The time when any flash or flame was observed was read from the chart trace, or the test was run for at least five minutes. The procedure was repeated at different temperatures and with different sample volumes until the minimum value of the ignition temperature was obtained. Between each test, the flask was flushed completely with clean dry nitrogen, and after flushing, a sufficient time interval was allowed before the next sample was injected to ensure that the flask contents re-equilibrated with air, and were stabilised at the desired temperature. The tests were made in appropriate temperature steps until the lowest temperature at when ignition occurs had been determined. The atmospheric pressure at the time of testing was 98.9 kPa.

Under the conditions of the study, the auto-ignition temperature of the test material was determined to be 332 ± 5 °C.