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Physical & Chemical properties

Auto flammability

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Link to relevant study record(s)

Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1999-02-15 to 1999-02-16
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
Version / remarks:
December 1992
Deviations:
no
Principles of method if other than guideline:
NA
GLP compliance:
yes (incl. QA statement)
Key result
Remarks on result:
no self ignition observed under the test conditions
Remarks:
As mentioned in IUCLID section 4.2 the test substance starts to decompose at about 280 °C. In conclusion, Urea 4 is not auto-flammable according to the criteria as described in the guidelines.

Using a linear increase in temperature of 0.5 K/min, Urea 4 shows two exothermic reactions. The first exothermic reaction started at about 260 °C. A maximum temperature of about 300 °C was measured in the sample cube. The second exothermic heat effect started at about 380 °C. At the end of the run, Urea 4 showed a loss of mass of about 70 % and coloured black.

Conclusions:
Using a linear increase in temperature of 0.5 K/min, Urea 4 shows two exothermic reactions. The first exothermic reaction started at about 260 °C. A maximum temperature of about 300 °C was measured in the sample cube. The second exothermic heat effect started at about 380 °C. At the end of the run, Urea 4 showed a loss of mass of about 70 % and coloured black. In conclusion, Urea 4 is not auto-flammable, according to the criteria as described in the guidelines.
Executive summary:

The relative self-ignition temperature of Urea 4 was determined according to EU method A.16. Using a linear increase in temperature of 0.5 K/min, Urea 4 shows two exothermic reactions. The first exothermic reaction started at about 260 °C. A maximum temperature of about 300 °C was measured in the sample cube. The second exothermic heat effect started at about 380 °C. At the end of the run, Urea 4 showed a loss of mass of about 70 % and coloured black. As mentioned in IUCLID section 4.2 the test substance starts to decompose at about 280 °C. In conclusion, Urea 4 is not auto-flammable according to the criteria as described in the guidelines.

Description of key information

Using a linear increase in temperature of 0.5 K/min, Urea 4 shows two exothermic reactions. The first exothermic reaction started at about 260 °C. A maximum temperature of about 300 °C was measured in the sample cube. The second exothermic heat effect started at about 380 °C. At the end of the run, Urea 4 showed a loss of mass of about 70 % and coloured black. In conclusion, Urea 4 is not auto-flammable according to the criteria as described in the guidelines.

Key value for chemical safety assessment

Additional information

The relative self-ignition temperature of Urea 4 was determined according to EU method A.16. Using a linear increase in temperature of 0.5 K/min, Urea 4 shows two exothermic reactions. The first exothermic reaction started at about 260 °C. A maximum temperature of about 300 °C was measured in the sample cube. The second exothermic heat effect started at about 380 °C. At the end of the run, Urea 4 showed a loss of mass of about 70 % and coloured black. As mentioned in IUCLID section 4.2 the test substance starts to decompose at about 280 °C. In conclusion, Urea 4 is not auto-flammable according to the criteria as described in the guidelines.