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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February 27, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
other: VDI 2263, sheet 1, Grewer Oven
Version / remarks:
1990
Qualifier:
according to guideline
Guideline:
other: Recommendations on the Transport of Dangerous Goods: Manual of Tests and Criteria: Appendix 6 Screening Procedures, Division 4.2: Substances which may be liable to spontaneous combustion
Version / remarks:
6th edition, New York and Geneva, 2015
GLP compliance:
no
Remarks on result:
no self ignition observed under the test conditions

The pure test item showed an exothermic effect starting at a temperature of 235 °C, which led to a maximum temperature of approx. 290 °C (corresponding temperature of the reference material 260 °C). After this, the temperature of the test item was permanent over the temperature of the reference material and led to a maximum temperature of approx. 490 °C (corresponding oven temperature 405 °C). After the test a black residue was left inside the wire basket.

For the test item in mixture with Kieselguhr an multistage exothermic process was detected starting at a temperature of approx. 240 °C, which led to a maximum temperature of approx. 470 °C (corresponding temperature of the reference material 370 °C).

Experiment Onset self-ignition / °C Maximum temperature / °C Corresponding reference temperature / °C
Pure test item 235 290 (1st Peak) 260 (1st Peak)
490 (2nd Peak) 405 (2nd Peak)
Test item in mixture with Kliselguhr (1:1) 240 290 (1st Peak) 270 (1st Peak)
430 (2nd Peak) 300 (2nd Peak)
470 (3rd Peak) 370 (3rd Peak)

The pure test item indicated a self-heating at atmospheric pressure starting at a temperature of 235 °C, which led to a maximum temperature of 290 °C. Then, the temperature of the test item was permanent over the temperature of the reference material and led to a maximum temperature of approx. 490 °C (corresponding oven temperature 405 °C).

Conclusions:
Not classified as self-heating substance
Executive summary:

The self-ignition behavior of the test item was determined in the oven according to VDI 2263, sheet 1. For this purpose, the test item was filled in a small wire basket and was placed into the oven; an additional basket was filled with a reference material (graphite). 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. Since very often, the test item melts before a self-ignition takes place, the self-ignition behavior of the sample blended with 50 wt.-% Kieselguhr was investigated in a third wire basket simultaneously. Kieselguhr has a high specific surface area and prevents the test item from flowing out of the baskets.

The pure test item indicated a self-heating at atmospheric pressure starting at a temperature of 235 °C, which led to a maximum temperature of 290 °C. Then, the temperature of the test item was permanent over the temperature of the reference material and led to a maximum temperature of approx. 490 °C (corresponding oven temperature 405 °C).

Based on the Grewer Oven test results, the test item has not to be classified as self-heating substance in class 4, division 4.2 according to the UN Transport Regulation.

Conclusion

Not classified as self-heating substance

Description of key information

Not classified as self-heating substance

Key value for chemical safety assessment

Additional information

VDI 2263 - Grewer Oven screening test