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RTK Standards

NFPA 704 standards include information on marking specific RTK hazards. Employees and emergency personnel have a right to know about these hazards. Our RTK labels and software can help you label them properly.

RTK Links

NFPA 704 RTK Labeling

Product Links Blue region - Health Hazard

The blue region of the RTK diamond indicates health hazard and may contain either a 0, 1, 2, 3 or 4. These numbers indicate the level of health exposure risk, and can be interpreted as follows:
  •  4  Very short exposure could cause death or major residual injury (e.g., hydrogen cyanide).
  •  3  Short exposure could cause serious temporary or residual injury (e.g., chlorine gas).
  •  2  Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g., chloroform).
  •  1  Exposure would cause irritation with only minor residual injury (e.g., turpentine).
  •  0  Poses no health hazard, no precautions necessary. (e.g., lanolin).


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).
[edit] Yellow/Reactivity

Yellow region - Reactivity

The yellow region of the RTK diamon indicates reactivity and may contain either a 0, 1, 2, 3 or 4. These numbers indicate the level of explosion, detonation or reaction risk, and can be interpreted as follows:
  •  4  Readily capable of detonation or explosive decomposition at normal temperatures and pressures (e.g., nitroglycerin).
  •  3  Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked (e.g., fluorine).
  •  2  Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water (e.g., phosphorus).
  •  1  Normally stable, but can become unstable at elevated temperatures and pressures (e.g., calcium).
  •  0  Normally stable, even under fire exposure conditions, and is not reactive with water (e.g., helium).


White region - Special

The white region of the RTK diamond may contain a number of special symbols. "W", with or without a strikeout, may be used to represent a reaction with water ("use no water"). "OX" or "OXY" may be used to represent an oxidizer. "COR" may be used to represent a strongly corrosive acid or base. "ACID" and "ALK" may be used to be more specific. "BIO" may be used to denote a biohazardous material. "CRYO" may be used to indicate a cryogenic. The radioactive trefoil may also be used.