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Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015-07-20 to 2015-07-27
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to guideline
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Version / remarks:
2003
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Key result
Auto-ignition temperature:
235 °C
Atm. press.:
1 013 hPa

Table 1: Experimental data on silicon compounds

Temperature [°C]

Observed pressure [mmHg]

Calculated pressure [mmHg]

17.7

46.3

46.9

28.6

78.0

78.0

44.8

154.9

155.1

68.5

374.3

373.6

82.9

599.4

599.7

 

Preliminary test

Test No.

Sample volume [µL]

Barometric pressure [mBar]

Temperature [°C]

Ignition delay [s]

Test result

1

150

1002

300

2

Ignition

2

150

1002

280

3

Ignition

3

150

1002

260

4

Ignition

4

150

1002

240

7

Ignition

5

150

1002

220

-

No ignition

 

Result value from preliminary test series: ignition: 240°C, no ignition: 220°C

 

Main test

First main test series

Test No.

Sample volume [µL]

Barometric pressure [mBar]

Temperature [°C]

Ignition delay [s]

Test result

1

150

1002

225

-

No ignition

2

150

1002

230

-

No ignition

3

150

1002

235

-

No ignition

4

150

1002

237

22

Ignition

5

250

1002

235

-

No ignition

6

350

1002

235

-

No ignition

 

Results first main test series: ignition: 237°C, no ignition: 235°C

Second main test series

Test No.

Sample volume [µL]

Barometric pressure [mBar]

Temperature [°C]

Ignition delay [s]

Test result

1

150

1007

237

24

Ignition

2

150

1007

235

-

No ignition

3

450

1007

235

-

No ignition

4

400

1007

235

-

No ignition

5

300

1007

235

-

No ignition

6

200

1007

235

-

No ignition

7

100

1007

235

-

No ignition

8

50

1007

235

-

No ignition

 

Results second main test: ignition: 237°C, no ignition: 235°C

 

Retest

Test No.

Sample volume [µL]

Barometric pressure [mBar]

Temperature [°C]

Ignition delay [s]

Test result

1

150

1005

237

-

Ignition

2

150

1005

235

-

No ignition

3

250

1005

235

-

No ignition

4

350

1005

235

-

No ignition

5

450

1005

235

-

No ignition

6

400

1005

235

-

No ignition

7

300

1005

235

-

No ignition

8

200

1005

235

-

No ignition

9

100

1005

235

-

No ignition

 

Results retest: ignition: 237°C, no ignition: 235°C

Evaluation

lowest value from pretest:

240°C

lowest value for first main test:

237°C

lowest value for second main test:

237°C

lowest value for retest:

237°C

 

Lowest value of all main test/retest series: 237°C.

 

Correction of the temperature according to the last DKD calibration (10/062014) of the temperature measurement chain (thermocouple + monitor) is already considered (value of -0.5°C).

 

Concluding Result

The auto-ignition temperature is 235°C (according to the assessment criteria and definition in the Council Regulation (EC) No 440/2008, test method A.15.

Conclusions:
An auto-ignition temperature value of 235°C at 1013 hPa was determined for the substance using a relevant test method and in compliance with GLP. The result is considered to be reliable.

Description of key information

Auto-ignition temperature: 235°C at 1013 hPa (DIN 51794)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
235 °C

Additional information

An auto-ignition temperature value of 235°C at 1013 hPa was determined for the substance using a relevant test method and in compliance with GLP. The result is considered to be reliable and is selected as key study.

The key study is supported by an auto-ignition temperature value of 235°C using a relevant method, but full details are not available.

In a secondary source to which reliability could not be assigned, an auto-ignition temperature value of 220°C at 1013 hPa was reported for the substance.

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