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Auto flammability

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:

14 May - 15 May 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

other: UN Recommendations on the TRANSPORT OF DANGEROUS GOODS: Manual of Tests and Criteria, Rev. 6 (2015)

Qualifier:

according to guideline

Guideline:

other: UN-Model Regulations, Rev. 20 (2017) VDI 2263, sheet 1 (1990)

GLP compliance:

no

Relative self-ignition temperature:

270 °C

Results
Self-ignition in the Grewer oven
In the investigation of self-ignition in the Grewer oven the pure test item showed an endothermic effect in the temperature range of 120 °C – 160 °C, which can be assigned to a drying of the test item since it contains 4.45% water. A small exothermic effect was observed starting at a temperature of 270 °C, which led to a maximum temperature of approx. 302 °C (corresponding oven temperature 294 °C). Two further exothermic effects were detected starting at temperatures of 320 °C and 390 °C, which led to maximum temperatures of approx. 389 °C (corresponding oven temperature 359 °C) and approx. 428 °C (corresponding oven temperature 418 °C), respectively. After the measurement, the basket was filled with black-grey residue.

For the test item in mixture with Kieselguhr an endothermic effect was observed in the temperature range of 110 °C – 150 °C, which can also be assigned to a drying of the test item. An exothermic effect was observed starting at a temperature of 270 °C, which led to a maximum temperature of approx. 460 °C (corresponding oven temperature 299 °C). No further thermal were detected up to the maximum test temperature of approx. 418 °C. After the measurement, the basket was filled with a white to grey residue.

Table below summarizes the results of the Grewer oven experiment.

 

Experiment	Onset self-heating [°C]	Maximum temperature [°C]
Pure test item	270 320 390	302 389 428
Test item in mixture with Kieselguhr (1:1)	270	460

 

Conclusion

The pure test item DMPSA-K₂ indicated self-heating at atmospheric pressure starting at a temperature of 270 °C. Due to the high onset temperature in the Grewer oven, it can be assumed that the UN Test N.4 using the 100 mm cube sample at 140 °C is negative.

 

On the basis of this result the tests on the self-ignition in the Grewer oven the test item is classified as follows:

UN Transport Regulation:

The test item does not have to be classified as self-heating substance in Class 4 Division 4.2 according to the UN Transport Regulation.

GHS / CLP Regulation EC 1272/2008 Annex 1: 2.11:

The test item does not have to be classified as self-heating substance according to GHS/CLP Regulation EC 1272/2008 Annex 1: 2.11.

 

Description of key information

270 °C at 1013 hPa (Grewer oven test, UN Test N.4)

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

270 °C

Additional information

UN Transport Regulation:

The test item does not have to be classified as self-heating substance in Class 4 Division 4.2 according to the UN Transport Regulation.

GHS / CLP Regulation EC 1272/2008 Annex 1: 2.11:

The test item does not have to be classified as self-heating substance according to GHS/CLP Regulation EC 1272/2008 Annex 1: 2.11.