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relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From June 22, 2016 to June 24, 2016
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
other: UN Test method N.4
GLP compliance:
not specified
Specific details on test material used for the study:
Appearance: white powder
Key result
Remarks on result:
no self ignition observed under the test conditions

Sample cube                    Temperature oven                 Max. Temp. sample                  Result: Self-heating yes/no

100 mm                             140°C                                       145°C                                           No

The classsification , based on the test results of the self-heating substances, is to be made according to the Regulation (EC) 1272/2008 of the Europeen Parliament and of the Council on Registration, Evaluation, Authorization and Restriction of Chemicals (REACH).

Under the study conditions, the substance was not classified as a self-heating substance.
Executive summary:

A study was conducted to determine the relative self-ignition temperature of the substance according to the UN Test Method N.4 as described in the UN Recommendations of Dangerous Goods, Manual of Tests and Criterian part III, sub-section Tests are performed to determine if the substance in a 25 mm or 100 mm sample cube, at test temperatures of 100, 120, or 140°C, undergo spontaneous ignition or dangerous self-heating, which is indicated by 60°C rise in temperature over the oven temperature within 24 h. The test substance was filled to the brim of the sample cube. The sample cube was housed in a cubic container made from a stainless steel net and was stored at the selected temperature in the center of a hot-air circulated drying cabinet. The temperature of the sample and the oven was recorded during the heating. A positive result was obtained if spontaneous ignition occured or if the temperature of the sample exceeded the oven temperature by 60°C during the 24 h test time. Otherwise, the result was considered negative. Under the study conditions, the substance was not classified as a self-heating substance (Kintrup 2016).

Description of key information

The relative self-ignition temperature was determined according to the UN Test Method N.4 (Kintrup, 2016).

Key value for chemical safety assessment

Additional information

The substance was not classified as a self-heating substance.