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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:
22-23 December 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. The substance is considered to be adequately characterised with its purity. Therefore full validation applies.
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Guideline:
DIN 51794 (Testing of mineral oil hydrocarbons - Determination of ignition temperature)
Qualifier:
according to
Guideline:
IEC 60079-4 (Electrical apparatus for explosive gas atmospheres. Part 4: Method of test for ignition temperature)
Version / remarks:
IEC 79-4, 1975.
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes
Specific details on test material used for the study:
- Storage condition of test material: In refrigerator (2-8°C) protected from light, container flushed with nitrogen
- Stability at higher temperatures: Yes, maximum temperature: 40°C, maximum duration: 10 days
Key result
Auto-ignition temperature:
240 °C
Atm. press.:
>= 1 017.5 - <= 1 017.6 hPa

Preliminary test

The estimated auto-ignition temperature was 280 °C.

 

Main study

Ignition of the test substance within 5 minutes after introduction was observed with each sample volume and with each test a minimum auto-ignition temperature was obtained.

Table 4.12/1: Main study – auto-ignition temperature of the test substance

Test

 

Volume [μL]

 

Auto-ignition temperature [°C]

 

Ignition delay [s]

Colour of the flame

 

1

70

273

17

Orange/Yellow

150

252

39

Orange/Yellow

300

247

54

Orange/Yellow

500

264

43

Orange/Yellow

2

100

262

46

Orange/Yellow

250

242

66

Orange/Yellow

450

261

36

Orange/Yellow

3

180

250

54

Orange/Yellow

280

245

57

Orange/Yellow

380

260

36

Orange/Yellow

The maximum deviation between the three values was < 10°C. According to the guidelines, no further testing was required.

The lowest temperature at which ignition of the test substance occurred was 242 °C. This temperature was rounded down to the nearest multiple of 5 °C giving an auto-ignition temperature of the test substance of 240 °C.

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 DIN 51794/IEC 79-4 standards (listed in EU A15 guideline).

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, and rounded down to the nearest 5°C, resulting in an auto-ignition 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/IEC/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.