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NOTE: This is an unformatted excerpt from our online fire protection training library.

Identifying Materials & Equipment

Combustible Dusts

Group Classification

Group classifications for dusts are based primarily on three properties:

Resistivity Resistivity is no longer defined by any specific measurement, partly because the resistivity is not a constant but varies with a number of factors. Resistivity is also not directly related to the explosion hazard, but metal dusts do present special problems.
Common particle sizes Particles of metal dusts tend to be smaller than particles of other dusts. The tests for dust penetration are based on specific particle sizes for the three groups that are specified in product standards.
Thermal blanketing effects Thermal blanketing may increase the surface temperature of an enclosure and lower the ignition temperature of a layer of dust of some materials.

The definitions of Groups E, F, and G do not specify these properties, but they are characteristics of the types of materials included in each group.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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