The blue diamond, on the
left side of the label, conveys Health Hazard information for persons
exposed to the material. The higher the number (on a scale of 0 to 4)
the higher the hazard, as follows:
0 - No hazard.
1 - Can cause irritation if not treated.
2 - Can cause injury. Requires prompt treatment.
3 - Can cause serious injury despite medical treatment.
4 - Can cause death or major injury despite medical treatment
The red diamond, at the top
of the label, conveys Flammability Hazard information. Again, the numbers
0 to 4 are used to rate the flammability hazard, as follows:
0 - Will not burn.
1 - Ignites after considerable preheating.
2 - Ignites if moderately heated.
3 - Can be ignited at all normal temperatures.
4 - Very flammable gases or very volatile flammable liquids
The yellow diamond, at the
right side of the label, conveys Reactivity (or Stability) information.
The numbers 0 to 4 are also used to rank reactivity hazards, as follows:
0 - Normally stable. Not reactive with water.
1 - Normally stable. Unstable at high temperature and pressure. Reacts
2 - Normally unstable but will not detonate.
3 - Can detonate or explode but requires strong initiating force or
heating under confinement.
4 - Readily detonates or explodes.
The white diamond, at the
bottom of the label, conveys Special Hazard information. This information
is conveyed by use of symbols which represent the special hazard. Two
of the common symbols are shown here:
“W” denotes the material is water reactive
“OX” denotes an oxidizing agent
Taking a quick glance at
the NFPA label provides a wealth of information. Follow the warnings
on the NFPA label or any label affixed to a container of material. Remember,
when you're working with hazardous materials, your safety depends on
(Adapted from Wes-Con fact