Special Hazards
Don't forget that the NFPA hazard scale has a higher hazard as the number gets larger.
The NFPA diamond shaped labels include a
fourth hazard class called Special Hazards.
This hazard class is colored WHITE.
The special hazards section can be empty or have one of the following officially recognized symbols:
| OX |
OXIDIZER |
 |
REACTIVE WITH WATER |
In addition the following unofficial symbols are sometimes used:
| COR |
CORROSIVE |
 |
CORROSIVE |
| ACID |
ACID |
| ALK |
ALKALI or BASE |
| BIO |
BIOLOGICAL HAZARD |
 |
BIOLOGICAL HZARD |
| POI |
POISONOUS |
 |
POISONOUS |
| CRYO |
CRYOGENIC |
 |
RADIOACTIVE |
