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Combustible

Definition

A combustible material can be a solid or liquid. The U.S. Occupational Health and Safety Administration (OSHA) defines a combustible liquid as "any liquid having a flash point at or above 100 deg. F (37.8 deg. C), but below 200 deg. F (93.3 deg. C), except any mixture having components with flashpoints of 200 deg. F (93.3 deg. C), or higher, the total volume of which make up 99 percent or more of the total volume of the mixture." Compare this definition to flammable, which indicates a liquid that is even easier to ignite (flash point below 100 oF). OSHA divides combustible (and flammable) liquids into several classes. If you'd like to see these, take a look at 29 CFR 1910.106. Combustible solids are those capable of igniting and burning. Wood and paper are examples of such materials.

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Additional Info

The U.S. Department of Transportation defines a combustible solid in 49 CFR 173.124 (Subpart D) as materials that:
1. Are solids which may cause a fire through friction, such as matches;

2. Show a burning rate faster than 2.2 mm (0.087 inches) per second when tested in accordance with UN Manual of Tests and Criteria; or

3. Any metal powders that can be ignited and react over the whole length of a sample in 10 minutes or less, when tested in accordance with UN Manual of Tests and Criteria.

These are closely related to the third broad class of materials listed under flammable solids.

Spontaneously combustible materials can undergo combustion and burn without the addition of heat or flame; arguably, the term "spontaneously flammable" is more appropriate. See the flammable solids entry for more info.

MSDS Relevance

Proper storage and use of combustible materials is absolutely critical in maintaining a safe work place. Avoid placing or using combustible materials near sources of heat or flame (direct sunlight, furnaces, pilot lights etc.).

Further Reading

• Visit the National Fire Protection Association home page for fire safety information, tips and codes.

• OSHA has a nice summary of 29 CFR 1910.106 (the Flammable and Combustible Liquids Standard) for small business owners.

See also: decomposition, flammable, flammable solid, flash point, temperature units.

Additional definitions from Google and OneLook.

Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.