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Physical & Chemical properties

Auto flammability

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Description of key information

Liquid: The substance is a 25% solution in water, therefore performing a study is technically not feasible.

Solid: According to the definition in Council Regulation (EC) No 440/2008, method A.16, the test item disodium tetrasulfide (EC no. 215-686-9) has to be considered as self-ignitable.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
240 °C

Additional information

Solid: The self-ignition properties of the test item disodium tetrasulfide (EC no. 215-686-9) were determined in a study according to Council Regulation (EC) No. 440/2008, method A.16. According to this EC-Guideline, the relative self-ignition temperature of a substance is the minimum environmental temperature in °C units at which the substance is ignited under defined conditions. A defined sample of the test substance is transferred into an oven at room temperature. This oven is heated up at a rate of 0.5 K/min to either the melting point of the substance (when below 400 °C) or to 400 °C. The temperature/time curves of the oven and of the bulk of the sample are registered. The ambient temperature (oven temperature) at which the sample reaches 400 °C by self heating is stated as the relative auto-ignition temperature of the substance.

In the given test conditions the measurable start of an exothermic reaction was detected at an ambient temperature of about 170 °C to 200 °C. The sample temperature was >400 °C at an ambient temperature of about 240 °C. According to the definition in Council Regulation (EC) No 440/2008, method A.16, the test item has to be considered as self-ignitable.