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Physical & Chemical properties

Auto flammability

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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2019-05-06
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:
yes
Remarks:
For EC A.15. test, the empty part (gaseous phase of the test item) of the flask exceeded 15% of its total capacity. This deviation was not considered to have affected the quality or the interpretation of the results obtained
GLP compliance:
yes (incl. certificate)
Key result
Auto-ignition temperature:
236 °C
Atm. press.:
ca. 97.7 - ca. 98.4 kPa

Results

Preliminary test

Injection No.

Volume of test item injected in the oven (µL)

Temperature (°C)

Auto-ignition

Maximal temperature of the air recorded in the center of the test flask after auto-ignition (°C)

Atm pressure (kPa)

Relative humidity (%)

 

 

Observed

 

 

Corrected

Y / N

Lag (s)

Observed

Corrected

1

70

98

98

N

/

/

/

98.2

34

2

70

149

149

N

/

/

/

98.2

32

3

70

199

199

N

/

/

/

98.2

30

4

70

246

246

Y

17

264

264

98.1

28

5

70

225

225

N

/

/

/

98.3

44

6

70

234

234

N

/

/

/

96.2

44

7

07

240

240

N

/

/

/

96.2

41

8

70

243

243

N

/

/

/

96.1

39

9

90

243

243

Y

16

263

263

96.1

38

10

110

243

243

Y

16

247

247

96.1

36

11

130

243

243

Y

13

261

261

96.1

37

12

150

243

243

Y

15

260

260

98.6

38

13

90

240

240

N

/

/

/

98.6

36

14

90

241

241

N

/

/

/

98.5

36

15

110

241

241

Y

16

259

259

98.5

35

16

110

239

239

Y

25

257

257

98.3

37

17

110

237

237

N

/

/

/

98.2

35

18

130

237

237

N

/

/

/

98.2

35

19

150

237

237

Y

34

253

253

98.2

36

20

150

235

235

N

/

/

/

98.1

36

21

170

235

235

Y

30

251

251

98.1

36

22

170

233

233

N

/

/

/

98.0

36

23

190

233

233

N

/

/

/

97.8

37

24

190

235

235

N

/

/

/

97.8

37

 

The lowest auto-ignition temperature was found to be around 235 °C (observed value) with a volume of 170 µL.

The main test was conducted using this volume. 

 

Main test

Volume of test item injected in the oven: 170 µL

Assay No. 1

Injection No.

Temperature (°C)

Auto-ignition

Lag (s)

Maximal temperature of the air recorded in the center of the test flask after auto-ignition (°C)

Atmospheric pressure (kPa)

Relative humidity (%)

Observed

Corrected

Observed

Corrected

1

235

235

N

/

/

/

97.8

38

2

236

236

Y

34

250

250

97.7

35

 

Assay No. 2

Injection No.

Temperature (°C)

Auto-ignition

Lag (s)

Maximal temperature of the air recorded in the center of the test flask after auto-ignition (°C)

Atmospheric pressure (kPa)

Relative humidity (%)

Observed

Corrected

Observed

Corrected

1

235

235

N

/

/

/

97.7

34

2

236

236

Y

23

252

252

97.7

34

 

Assay No. 3

Injection No.

Temperature (°C)

Auto-ignition

Lag (s)

Maximal temperature of the air recorded in the center of the test flask after auto-ignition (°C)

Atmospheric pressure (kPa)

Relative humidity (%)

Observed

Corrected

Observed

Corrected

1

236

236

Y

31

252

252

98.4

31

2

235

235

N

/

/

/

98.4

31

Assay No. 4

 

Injection No.

Temperature (°C)

Auto-ignition

Lag (s)

Maximal temperature of the air recorded in the center of the test flask after auto-ignition (°C)

Atmospheric pressure (kPa)

Relative humidity (%)

Observed

Corrected

Observed

Corrected

1

235

235

N

/

/

/

98.4

30

2

236

236

N

/

/

/

98.4

26

3

237

237

Y

25

254

254

98.4

27

 

Assay No. 5

Injection No.

Temperature (°C)

Auto-ignition

Lag (s)

Maximal temperature of the air recorded in the center of the test flask after auto-ignition (°C)

Atmospheric pressure (kPa)

Relative humidity (%)

Observed

Corrected

Observed

Corrected

1

236

236

Y

26

253

253

98.4

26

2

235

235

N

/

/

/

98.4

25

 

Summary

Only the auto-ignition runs for each assay are summarised in the following table:

 

Auto-ignition temperature (°C)

Auto-ignition

Lag (s)

Maximal temperature of the air recorded in the center of the test flask after ignition (°C)

Atmospheric pressure (kPa)

Relative humidity (%)

Assay No.

Observation

Corrected

Observed

Corrected

1

236

236

34

250

250

97.7

35

2

236

236

23

252

252

97.7

34

3

236

236

31

252

252

98.4

31

4

237

237

25

254

254

98.4

27

5

236

236

26

253

253

98.4

25

 

Conclusion

The auto-ignition temperature of the test item was 236 °C ± 3 °C (corrected temperature).

Conclusions:
An auto flammability value of 236 °C ± 3°C at 97.7 to 98.4 kPa was determined using a relevant test method and in compliance with GLP. The result is considered to be reliable.

Description of key information

Auto-ignition temperature: 236°C at 97.7 to 98.4 kPa (EU Method A.15)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
236 °C

Additional information

An auto-ignition temperature value of 236 ± 3°C at 97.7 to 98.4 kPa was determined using a relevant test method and in compliance with GLP.  The result is considered to be reliable and has been selected as the key study.

In a supporting study, an auto-ignition temperature value of 243°C at 961.4 to 969.5 hPa was determined using a relevant test method and in compliance with ISO 9001:2008.

In a secondary source to which reliability could not be assigned, an auto-ignition temperature value of 400°C was reported for the substance.