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The U.S. Occupational Safety and Health 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."
Combustible solids are those capable of igniting and burning. Wood and paper are examples of such materials.
Posters for the safe handling of flammable and combustible liquids are available at Safety Emporium.
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.
NFPA 30 is the NFPA's Flammable and Combustible Liquids Code. You can purchase a copy from their web site. Your state and local fire codes are likely to be based in part on this standard; consult with your local fire marshal if you ever have code compliance questions.
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