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Identifying Materials & Equipment

Liquids, Vapors & Gases

MIC Ratio

The Minimum Igniting Current (MIC)Ratio is the ratio of the minimum current required from an inductive spark discharge to ignite the most easily ignitible mixture of a gas or vapor, divided by the minimum current required from an inductive spark discharge to ignite methane Methane is used as a reference gas in this definition in much the same way that air is used as a reference for vapor density or water is used as a reference for specific gravity. under the same test conditions.

A similar measure, MIC Minimum Ignition Current, which was a direct measure rather than a comparison ratio, was previously used in some classification systems. MIC and MIC ratio are both measures of the relative ease (or difficulty) with which a gas-air or vapor-air mixture may be ignited. Easily ignited materials are more hazardous Examples of easily ignitible materials are acetylene and hydrogen which have MIC ratios of 0.28 and 0.25 respectively. Ammonia, which has a MIC ratio of 6.85 is an example of a material that is relatively difficult to ignite.. MIC ratio is now used in defining Class I Groups Class I groups B, C, and D are defined by their MIC ratio and MESG..
NOTE: This is an unformatted excerpt from our online fire protection training library.

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