HAZMAT Class 4 Flammable solids

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HAZMAT Class 4: Flammable Solids refers to a category of hazardous materials, as classified by the United States Department of Transportation (DOT). These materials are solids that are readily combustible, or may cause or contribute to fire through friction. This class is further subdivided into three divisions: 4.1 Flammable Solids, 4.2 Spontaneously Combustible, and 4.3 Dangerous When Wet.

Class 4.1: Flammable Solids[edit]

Flammable Solids are materials that are readily combustible under conditions of ambient temperature and pressure. They can be ignited easily through friction, absorption of moisture, spontaneous chemical changes, or retained heat from manufacturing or processing. Examples of these materials include sulfur, camphor, and naphthalene.

Class 4.2: Spontaneously Combustible[edit]

Materials in this division are liable to spontaneous heating under normal conditions, or to heating up in contact with air, and being then liable to catch fire. This includes substances like white phosphorus which can ignite spontaneously at temperatures of around 30°C, and pyrophoric substances which can ignite spontaneously in air.

Class 4.3: Dangerous When Wet[edit]

These are materials that, by interaction with water, are liable to become spontaneously flammable or to give off flammable or toxic gas at a rate greater than 1 liter per kilogram of the material, per hour. Examples include sodium, potassium, and calcium.

Safety and Handling[edit]

Handling of Class 4 materials requires special precautions. This includes the use of Personal Protective Equipment (PPE), proper storage and transportation methods, and training for emergency response. The Material Safety Data Sheet (MSDS) for each substance provides detailed information on handling procedures, health hazards, and emergency response techniques.

See Also[edit]


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