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Auto flammability

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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2011-09-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Process safety study, conducted in compliance with DIN EN ISO/IEC 17025. Although non-GLP, methodology is recognised accreditation.
Qualifier:
according to guideline
Guideline:
other: Test Procedure VDI 2263, Part 1
Deviations:
no
Principles of method if other than guideline:
The test was performed as stipulated in Test Procedure VDI 2263, Part 1, which is similar to UN Classification testing requirements. The sample in its delivery state and an inert reference sample are heated up to 370 °C at a rate of 0.5 K/min in an air flow of about 20 l/h. Subsequently, a fresh sample was heated at different ambient temperatures for a period of about at least five hours.
The temperature limit where only a negligible reaction was observed (delta T < 3 K) is called exothermic onset according to Grewer.
GLP compliance:
no
Remarks:
but in compliance with DIN EN ISO/IEC 17025
Key result
Relative self-ignition temperature:
> 370 °C
Remarks on result:
other: Atmospheric pressure is assumed.
Remarks:
at atm. press. of 101.325 kPa

The exothermic reaction according to Grewer started at 210 °C (see graphs attached below).

Comment: The temperature determined in this way depends upon the test method. Therefore it only serves as a rough estimate and for

comparison purposes. It cannot be used in all cases as the basis for the establishment of safe operating conditions. Self-heating

by oxidation depends on the sample size and the duration of the temperature exposure. Therefore, an increased sample volume

will considerably lower the ignition temperature.

Conclusions:
The substance is not deemed to pose a self ignition hazard.
Executive summary:

The test was performed as stipulated in Test Procedure VDI 2263, Part 1, which is similar to UN Classification testing requirements. The sample in its delivery state and an inert reference sample are heated up to 370 °C at a rate of 0.5 K/min in an air flow of about 20 l/h. Subsequently, a fresh sample was heated at different ambient temperatures for a period of about at least five hours. 

The temperature limit where only a negligible reaction was observed (delta T < 3 K) is called exothermic onset according to Grewer. An exothermic reaction starting from 210 °C was observed, however this was considered to be minimal. The substance is not considered to pose a hazard by auto-ignition.

Description of key information

The substance is not considered to pose a hazard by auto-ignition.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
370 °C

Additional information

The test was performed as stipulated in Test Procedure VDI 2263, Part 1, which is similar to UN Classification testing requirements. The sample in its delivery state and an inert reference sample are heated up to 370 °C at a rate of 0.5 K/min in an air flow of about 20 l/h. Subsequently, a fresh sample was heated at different ambient temperatures for a period of about at least five hours. 

The temperature limit where only a negligible reaction was observed (delta T < 3 K) is called exothermic onset according to Grewer. An exothermic reaction starting from 210°C was observed, however this was considered to be minimal. The substance is not considered to pose a hazard by auto-ignition.