Molybdenum sulfide

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:

2012-07-02

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)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

GLP inspection date: 29./30.Nov.2010

Relative self-ignition temperature:

321 °C

Remarks on result:

other:

Remarks:

at atm. press. of ca.1.0 atm

At an oven temperature of 321 °C the temperature of the sample increased rapidly to over 400 °C resulting in the maximum temperature of 687 °C whereas the temperature of the oven rises constantly.

Conclusions:

The reaction/oxidation behaviour of MoS2 has been studied extensively by researchers (see for example Risdon, 2003 and references therein). MoS2 can be oxidised to MoO3 in an exothermic reaction. The reaction requires a high activation energy. In industry this process is used to produce technical MoO3 from molybdenite ore (MoS2). This technical process takes place under controlled conditions in large multiple hearth furnaces at ca. 500-600 °C, to achieve complete oxidation. The self-ignition temperature is not a definitive value for a substance, as it is a function of several variables, such as particle size, surface area, way of confinement and sample amount. Under the conditions of the EU A.16 test, the self ignition temperature for a sample of MoS2 was determined at 321 °C.

Description of key information

The relative self-ignition temperature of MoS₂ is 312 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

321 °C

Additional information

In an experimental study according to method EU A.16, the relative self-ignition temperature of a sample of MoS₂ has been determined at 312 °C (Henke, 2012). The self-ignition temperature is not a definitive value for a substance, as it is a function of several variables, such as particle size, surface area, way of confinement and sample amount. Self-ignition of MoS₂ does not occur under normal ambient conditions of handling, storage, transport or use.