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Flammable liquid

File:Flammable liquid.svg
Degree of Hazard 3 flammable liquid warning sign

Generally, a flammable liquid is a liquid that can catch fire. However, it is not the liquid itself that catches fire, but the vapor cloud above the liquid that will burn if the vapor's concentration is between the Lower Flammable Limit (LFL) and Upper Flammable Limit (UFL) of the flammable liquid.

US definitions

In the US, there is a precise definition of flammable liquid as one with a flash point below Script error: No such module "convert".. Less-flammable liquids (with a flashpoint between 100 degrees and 200 degrees Fahrenheit) are defined as combustible liquids. 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.

These categories are further subdivided, depending on the liquid's flash point and boiling point.

  • Class IA flammable liquids have a flash point below 73 °F (22.8 °C) (the upper end of the common range of room temperature) and a boiling point below 100 °F
  • Class IB flammable liquids have a flash point below 73 °F (22.8 °C) and a boiling point greater than or equal to 100 °F (37.8 °C)
  • Class IC flammable liquids have a flash point greater than or equal to 73 °F (22.8 °C) and below 100 °F (37.8 °C)
  • Class II combustible liquids have a flash point greater than or equal to 100 °F (37.8 °C) and below 140 °F (60 °C)
  • Class IIIA combustible liquids have a flash point greater than or equal to 140 °F (60 °C) and below 200 °F (93.3 °C)
  • Class IIIB combustible liquids have a flash point greater than or equal to 200 °F (93.3 °C)

Examples of flammable liquids

Flammable liquids include, but are not limited to

Common name CAS Number Flash point Class Autoignition Temperature
Acetone 67-64-1 Script error: No such module "convert". IB Script error: No such module "convert".
Biodiesel n/a mixture >Script error: No such module "convert". IIIB
Dimethyl ether 115-10-6 Script error: No such module "convert". IA Script error: No such module "convert".
Diesel n/a mixture >Script error: No such module "convert". II Script error: No such module "convert".
Ethanol 64-17-5 Script error: No such module "convert". IB Script error: No such module "convert".
Diethyl ether 60-29-7 Script error: No such module "convert". IA Script error: No such module "convert".
Gasoline n/a mixture <Script error: No such module "convert". IB Script error: No such module "convert".
Jet fuel n/a mixture >Script error: No such module "convert". II Script error: No such module "convert".
Kerosene (paraffin oil) n/a mixture >Script error: No such module "convert". IIIA Script error: No such module "convert".
Methanol 67-56-1 Script error: No such module "convert". IB Script error: No such module "convert".
Nitromethane 75-52-5 Script error: No such module "convert".
Vegetable oil (canola) n/a mixture IIIB Script error: No such module "convert".[1]

See also

References

  1. ^ MSDS for Refined, Bleached and Deodorized Canola Oil, issued by Avatar Corp, 16 November 2001, accessed 22 March 2008

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