Flammable liquid
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Generally, a flammable liquid means a liquid which may catch fire easily.
In the USA, there is a precise definition of flammable liquid as one with a flashpoint below 100 degrees Fahrenheit. Less-flammable liquids (with a flashpoint between 100 degrees and 200 degrees Fahrenheit) are defined as combustible liquid. This definition is used by the National Fire Protection Association, The US Department of Transportation, the US Environmental Protection Agency, the US Occupational Safety and Health Administration and others.
Threse categories are further subdivided, depending on the liquid's flashpoint and boiling point.
- Class IA flammable liquids have a flash point below 73 °F and a boiling point below 100 °F
- Class IB flammable liquids have a flash point below 73 °F and a boiling point greater than or equal to 100 °F
- Class IC flammable liquids have a flash point greater than or equal to 73 °F and below 100 °F
- Class II combustible liquids have a flash point greater than or equal to 100 °F and below 140 °F
- Class IIIA combustible liquids have a flash point greater than or equal to 140 °F and below 200 °F
- Class IIIB combustible liquids have a flash point greater than or equal to 200 °F
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