National Fire Protection Association (NFPA) Hazmat Diamond
Hazard Identification System Laboratory Operations Review 14
HAZARD SYMBOL 0 1 2 3 4
Health
Flammability
Instability
Special hazards
Can be lethal
Will vaporize &
burn at normal
temp
May explode at
normal temp &
pressures
Blue diamond
(left)
Red diamond
(top)
Yellow diamond
(right)
White diamond
(bottom)
No hazard
Will not burn
Stable
Can cause signifi-
cant irritation
Must be pre-
heated for igni-
tion to occur
↑temp makes
unstable
Can cause tempo-
rary incapacita-
tion or residual
injury
Must be heated
or in ↑ambient
temp to burn
Violent chemical
change at ↑temp
or pressures
Can cause serious or
permanent injury
Can be ignited
under almost all
ambient temps
May explode from
↑temp or shock
W = unusual reactivity with water
OX = oxidizer
continued...
