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Auto flammability

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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
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:
other: Grewer-Oven-Test, VDI 2263-1
Principles of method if other than guideline:
The self-heating in air was studied in a screening test according to Grewer (Grewer-Oven-Test, VDI 2263-1). A wire basket (V = 8 cm') was heated in a preheated air stream and any temperature change in the sample centre was measured compared to an inert reference substance (graphite). The heating rate was 1.8 K/min.
In addition to the Grewer-Oven-Test with the pure substance a mixture with Kieselgur (1:1) was tested. Kieselgur prevents the meshes of the basket to be filled with swollen material: air can diffuse into the wire basket during the whole test. Additionally, Kieselgur prevents the wire basket from emptying due to melting of the product. In this case the self-heating of the product in contact with porous material with high specific surface e.g. insulation material or deposits is simulated.
The self-ignition temperature is the temperature at which the temperature rise rate of the test item exceeds the temperature rise rate of the reference (graphite) due to an exothermal effect.
GLP compliance:
no
Key result
Relative self-ignition temperature:
230 °C

In the screening test according to Grewer with the pure product a significant self-heating was detected at 230 °C. Possibly a weak exothermal reaction started before this effect. A multistage reaction was observed which led to a maximum product temperature of <450 °C.

In the screening test with the Kieselgur mixture (1:1) a significant self-heating was detected at 240 °C. A multistage reaction was observed which led a to a maximum product temperature of <450 °C.

Conclusions:
According to the guideline VDI 2263, sheet 1 (Grewer-Oven) self-ignition was observed at 230 °C.
Executive summary:

In the screening test according to Grewer with the pure product a significant self-heating was detected at 230 °C. Possibly a weak exothermal reaction started before this effect. A multistage reaction was observed which led to a maximum product temperature of <450 °C.

In the screening test with the Kieselgur mixture (1:1) a significant self-heating was detected at 240 °C. A multistage reaction was observed which led a to a maximum product temperature of <450 °C.

UN Transport Regulations: Due to the results from the Grewer-Oven-Test further tests are recommended to classify (or exclude) the test item as "self-heating substance" of class 4.2 according to the transport regulations.

EU-GHS/CLP: Due to the results from the Grewer-Oven-Test further tests are recommended to classify (or exclude) the test item as "self-heating substance" according to the EU-GHS/CLP regulations.

Description of key information

According to the guideline VDI 2263, sheet 1 (Grewer-Oven) self-ignition was observed at 230 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
230 °C

Additional information

The self-heating in air was studied in a screening test according to Grewer (Grewer-Oven-Test, VDI 2263-1). A wire basket (V = 8 cm') was heated in a preheated air stream and any temperature change in the sample centre was measured compared to an inert reference substance (graphite). The heating rate was 1.8 K/min. In addition to the Grewer-Oven-Test with the pure substance a mixture with Kieselgur (1:1) was tested. Kieselgur prevents the meshes of the basket to be filled with swollen material: air can diffuse into the wire basket during the whole test. Additionally, Kieselgur prevents the wire basket from emptying due to melting of the product. In this case the self-heating of the product in contact with porous material with high specific surface e.g. insulation material or deposits is simulated. The self-ignition temperature is the temperature at which the temperature rise rate of the test item exceeds the temperature rise rate of the reference (graphite) due to an exothermal effect.

In the screening test according to Grewer with the pure product a significant self-heating was detected at 230 °C. Possibly a weak exothermal reaction started before this effect. A multistage reaction was observed which led to a maximum product temperature of <450 °C.

In the screening test with the Kieselgur mixture (1:1) a significant self-heating was detected at 240 °C. A multistage reaction was observed which led a to a maximum product temperature of <450 °C.