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Class B - Flammable and Combustible Materials

  • Flammable and combustible indicate the ability of a material to ignite and burn readily.
  • The term flammable liquid is used for materials having a flashpoint of less than 37.8 C (100 F) under test conditions.
  • The flashpoint is the minimum ambient temperature at which a liquid gives off enough vapour in sufficient concentration to ignite.
  • The flashpoint indicates how easily a material will ignite and burn.
  • A liquid is called a combustible liquid when it has a flashpoint of 37.8 C (100 F) or more but less than 93.3 C (200 F).
  • Generally combustible materials are less easily ignited then flammable materials and require somewhat higher temperatures than flammable materials before they start to burn.
  • Flammable and combustible materials could be gases, liquids or aerosols.
Examples of flammable liquids are
  • benzene, turpentine, gasoline, etc.
Examples of Combustible liquids are
  • Kerosene, carbolic acid, naphthalene, etc.

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