The MIE of a substance is the Minimum Ignition Energy needed in order to ignite a flammable substance with air or oxygen, measures by a standard procedure.

Depending on the specific application, there are several standard procedures for determining MIE of dust clouds, solvent vapours and gases.

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The common element in all procedures is that the energy is generated by an electrostatic spark discharge released from a capacitive electrical circuit. The exact circuit components and the arrangement of electrodes between which sparks are generated are the principle differences between the methods. 

A list with MIE values of a series of substances can be downloaded here: MIE-list.pdf