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NFPA 704 Diamond Information: Red Segment

Red region - Flammability

The red region of the RTK diamon indicates flammability and may contain either a 0, 1, 2, 3 or 4. These numbers indicate the level of flammability, explosion and ignition risk, and can be interpreted as follows:
  •  4  Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily (e.g., propane). Flash point below 23C (73F).
  •  3  Liquids and solids that can be ignited under almost all ambient temperature conditions (e.g., gasoline). Flash point below 38C (100F) but above 23C (73F).
  •  2  Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur (e.g., diesel fuel). Flash point between 38C (100F) and 93C (200F).
  •  1  Must be pre-heated before ignition can occur (e.g., canola oil). Flash point over 93C (200F).
  •  0  Will not burn (e.g., water).


  • More information on the BLUE NFPA DIAMOND segment
  • More information on the NFPA DIAMOND YELLOW segment
  • More information on the NFPA DIAMOND WHITE segment
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