Ammonium 2-ethylhexyl sulphate

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:

from 2019-06-11 to 2020-08-03

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: VDI 2263, sheet 1, Grewer Oven

Version / remarks:

1990

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.16 (Relative Self-Ignition Temperature for Solids)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: UN Manual of Tests and Criteria: Appendix 6 Screening Procedures, Division 4.2: Substances which may be liable to spontaneous combustion

Version / remarks:

7th edition, New York and Geneva, 2019

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Key result

Relative self-ignition temperature:

ca. 180 °C

In the investigation of self-ignition in the Grewer Oven for the pure test item a first small exothermic effect was detected starting at a temperature of 180 °C (2 K above the corresponding temperature of the reference material). A second small exothermic effect was detected starting at temperature of 225 °C which led to a maximum temperature of approx. 245 °C and a deviation from the temperature of the reference item of only 3 K. At 265 °C an endothermic effect was observed followed by a third exothermic effect starting at a temperature of 290 °C which leads to a temperature of 3 K above the temperature of the reference item. In the region 370 – 380 °C another endothermic effect was detected. A fourth exothermic effect was observed starting at 380 °C which led to a maximum temperature of approx. 415 °C (6 K above the corresponding temperature of the reference material). A black residue remained in the wire basket after the test.

For the test item in mixture with Kieselguhr a small exothermic process was detected starting at 150 °C. At 170 °C a first endothermic effect and at 250 °C a second endothermic effect were observed. A third endothermic effect was detected starting at a temperature of 330 °C followed by an exothermic effect starting at a temperature of approx. 380 °C which led to a maximum temperature of approx. 413 °C (4 K above the corresponding temperature of the reference material).

 

Table 1: Results of the screening test for self-ignition in the Gewer-Oven

Experiment	Onset self- ignition / °C	Maximum temperature / °C
Pure test item	Approx. 180 Approx. 225 Approx. 290 Approx. 380	< 2 K above reference 245 < 3 K above reference 415
Test item in mixture with Kieselguhr (1:1)	Approx. 150 Approx. 380	< 2 K above reference 413

 

Conclusions:

The pure test item indicated self-ignition at atmospheric pressure starting at a temperature of 180 °C.

Executive summary:

A study according to UN Manual of Tests and Criteria, Devision 6.2 and VDI 2263, sheet 1 was performed to investigate the relative self-ignition of the test item. The test item was filled in a small wire basket of a volume of 8 cm³ and this wire-basket was placed into the oven. The temperature of the oven was increased with a constant heating rate (1.2 K/min) in an air stream of 100 to 120 L per hour and the temperature of the sample was recorded as a function of time at intervals of 10 seconds. The self-ignition behaviour of the pure test item was indicated as a deviation between sample temperature and reference temperature.
In the investigation of self-ignition in the Grewer Oven for the pure test item a first small exothermic effect was detected starting at a temperature of 180 °C (2 K above the corresponding temperature of the reference material). A second small exothermic effect was detected starting at temperature of 225 °C which led to a maximum temperature of approx. 245 °C. At 265 °C an endothermic effect was observed followed by a third exothermic effect starting at a temperature of 290 °C. In the region 370 – 380 °C another endothermic effect was detected. A fourth exothermic effect was observed starting at 380 °C which led to a maximum temperature of approx. 415 °C. A black residue remained in the wire basket after the test. The relative self-ignition of the test item was determined to be at ca. 180 °C.

Description of key information

The pure test item indicated self-ignition at atmospheric pressure starting at a temperature of 180 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

180 °C

Additional information

A study according to UN Manual of Tests and Criteria, Devision 6.2 and VDI 2263, sheet 1 was performed to investigate the relative self-ignition of the test item. The test item was filled in a small wire basket of a volume of 8 cm³ and this wire-basket was placed into the oven. The temperature of the oven was increased with a constant heating rate (1.2 K/min) in an air stream of 100 to 120 L per hour and the temperature of the sample was recorded as a function of time at intervals of 10 seconds. The self-ignition behaviour of the pure test item was indicated as a deviation between sample temperature and reference temperature.
In the investigation of self-ignition in the Grewer Oven for the pure test item a first small exothermic effect was detected starting at a temperature of 180 °C (2 K above the corresponding temperature of the reference material). A second small exothermic effect was detected starting at temperature of 225 °C which led to a maximum temperature of approx. 245 °C. At 265 °C an endothermic effect was observed followed by a third exothermic effect starting at a temperature of 290 °C. In the region 370 – 380 °C another endothermic effect was detected. A fourth exothermic effect was observed starting at 380 °C which led to a maximum temperature of approx. 415 °C. A black residue remained in the wire basket after the test. The relative self-ignition of the test item was determined to be at ca. 180 °C.