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Physical & Chemical properties

Auto flammability

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Description of key information

Not a self-heating substance of Class 4 Division 4.2, UN Test N.4, Younis (2015)

Key value for chemical safety assessment

Additional information

The self-heating properties of the test material were investigated in accordance with the standardised guideline UN Test N.4 from the United Nations Document ‘Recommendations on the Transport of Dangerous Goods’ under GLP conditions. The study was awarded a reliability score of 1 in accordance with the principles for assessing data quality set forth by Klimisch et al. (1997).

The series of tests is conducted to define whether a substance will undergo spontaneous ignition or dangerous self-heating. This is indicated by a sample temperature rise of 60 K (or more) above the set oven temperature. A cubic sample basket of 100 mm side length was filled with 761.2 g of the test material and subjected to the test temperature of 140 °C and held isothermally for a test period of 24 hours. The temperature of the sample and oven were continually monitored / recorded.

On completion of testing the sample had formed a solid mass, with no change in size. No ignition was observed.

From the graph created for the isothermal test in a 100 mm cube at 140 °C, it was shown that the test material does not show signs of exothermic activity.

Under the conditions of this study, the test material was determined not to possess self-heating properties and therefore is not subject to transportation restrictions of UN Class 4 Division 4.2.