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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:
1995-03-28 to 1995-05-16
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. No deviation affected the quality of the study. Purity and isomers composition are available from the notifier. Therefore full validation applies.
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Qualifier:
according to
Guideline:
IEC 60079-4 (Electrical apparatus for explosive gas atmospheres. Part 4: Method of test for ignition temperature)
Version / remarks:
Anon (1987), Electrical apparatus for explosive gas atmospheres. Part 4: Method of test for ignition temperature. IEC Publications 79-4, p1-19.
GLP compliance:
yes (incl. certificate)
Remarks:
UK GLP compliance programme (inspected on 31 January 1994 / signed on 16 March 1994)
Specific details on test material used for the study:
Storage conditions: metal bottle at room temperature.
Auto-ignition temperature:
294 °C
Atm. press.:
>= 100.77 - <= 101.31 kPa
Remarks on result:
other: accuracy: +/-5°C

The results obtained during testing are detailed below:

Test temperature
(°C)
Test volume
(µL)
Ignition delay
(s)
Observations
50 70 > 300 No ignition occurred.
100 70 > 300 No ignition occurred.
150 70 > 300 No ignition occurred.
200 70 > 300 No ignition occurred. Grey vapour was emitted.
250 70 > 300 No ignition occurred. Grey vapour was emitted.
300 70 24 The sample ignited with a yellow/blue flame. Grey vapour was emitted.
290 (clean flask) 70 > 300 No ignition occurred. Grey vapour was emitted.
296 70 > 300 No ignition occurred. Grey vapour was emitted.
298 70 19 The sample ignited with a yellow/blue flame. Grey vapour was emitted.
296 (clean flask) 70 22 The sample ignited with a yellow/blue flame. Grey vapour was emitted.
292 (clean flask) 70 > 300 No ignition occurred.
294 (clean flask) 70 21 The sample ignited with a yellow/blue flame. Grey vapour was emitted.
292 (clean flask) 200 > 300 No ignition occurred. Grey vapour was emitted.
292 (clean flask) 400 > 300 No ignition occurred. Grey vapour was emitted.
292 (clean flask) 600 > 300 No ignition occurred. Grey vapour was emitted.
292 (clean flask) 800 > 300 No ignition occurred. Grey vapour was emitted.
292 (clean flask) 1000 > 300 No ignition occurred. Grey vapour was emitted.
292 (clean flask) 70 > 300 No ignition occurred. Grey vapour was emitted.

Room temperature: 18 - 21°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 IEC 79-4 method (listed in EU A15 guideline).

The test substance was injected into a heated flask, varying the volume, until the lowest temperature at which ignition occurs was determined. The relevant parameters were recorded for the final result.

The auto-ignition temperature of the test substance is 294°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:
294 °C

Additional information

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

It should be noted that, due to the multi-isomers nature of the substance tested, this result may refer to the most flammable one. However, as structures are close and b.p. range limited, auto-ignition temperature is not anticipated to vary significantly between components.

This parameter/method is not relevant for classification, however the information is useful regarding process safety and potential additional fire hazard.