Special Precautions (White)

The fourth, white, field of the hazard signal can have variable content, depending on who prepared the signal. The 1990 edition of the National Fire Codes (section 704, chapter 5) specifies only two symbols. Additional symbols are commonly included. The field may also be left blank if no special hazards are present.

Special Hazards Sign

Special Hazard Symbols

Water ReactivityMaterial shows unusual reactivity with water.
OXMaterial possesses oxidizing properties.
ACIDMaterial is an acid.
ALKMaterial is a base (alkaline).
CORMaterial is corrosive.
RadioactiveMaterial is radioactive.