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Diss Factsheets

Physical & Chemical properties

Auto flammability

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Link to relevant study record(s)

Reference
Endpoint:
auto-ignition temperature (liquids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Performance of study: 13.10.2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: DIN 51794
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Landesamt fuer Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Rheinland-Pfalz, Germany
Auto-ignition temperature:
ca. 295 °C
Atm. press.:
ca. 99 299 Pa
Remarks on result:
other:

According to the requirements for repeatability of the DIN standard, three lowest values of the main study have to lie within the range of 10 K (if auto ignition temperature is below 300 °C) respectively 20 K (if auto ignition temperature is above 300 °C).

The following lowest values were recorded:

Experiment

Value

First test series

307 °C

Determination of lowest value

304.5 °C

Repetition

298.5 °C

 

The lowest value of the auto ignition temperature is 298.5 °C. This value was determined using 20 drops test item. The test item showed auto ignition after 112 seconds. The auto ignition temperature is (result of determination) is the lowest value from the lowest values of the three experiments, rounded down to the whole multiple of 5 °C. Therefore, the auto ignition temperature is stated as 295 °C.

The three lowest values of the main study lay within a range of 10 K (as required for auto ignition temperatures below 300 °C).

The precision range which is demanded in the DIN standard for one single test system and no second observer was fulfilled, although two different observers had performed the examination.

Conclusions:
The auto ignition temperature of the test substance 3-mercaptopropanoic acid has been determined to be 295 °C at 99299 Pa.
Executive summary:

The test material 3 -mercaptopropanoic acid has been determined to have auto ignition temperature 295 °C at 99299 Pa, according to procedure and demands of EU-Method A.15, Directive 440/2008/EC dated 31.05.2008, "Auto Ignition Temperature" and DIN 51794.

Description of key information

Auto ignition temperature: 295 °C at 99299 Pa.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
295 °C

Additional information

The study performed in experimental laboratory (Paulus,2009, LAUS), dedicated to estimate the auto ignition of the test material 3 -mercapropropanoic acid has been chosen as a key study. The auto ignition temperature has been determined to be 295 °C at 99299 Pa. Study was performed according to procedure and demands of EU-Method A.15, Directive 440/2008/EC dated 31.05.2008, "Auto Ignition Temperature" and DIN 51794.


Another study (Rampy, 1973, Dow) reports the auto ignition temperature to be 350 °C; the report was not performed according to current standards but qualitatively supports the key study.