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

Identifying Materials & Equipment

Special Considerations

Certain metal dusts may have characteristics that require safeguards beyond those required for atmospheres containing the dusts of aluminum, magnesium, and their commercial alloys. For example, zirconium, thorium, and uranium dusts have extremely low ignition temperatures [as low as 20°C (68°F)] and minimum ignition energies lower than any material classified in any of the Class I or Class II groups.
All Group E dusts are more dangerous than other dusts because of their conductivity, so areas classified due to metal dusts are always Division 1 areas. There are NO Class II, Division 2, Group E areas.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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