It is capable of detonation or explosive reaction if it
is subjected to a strong initiating source or if heated
It is readily capable of detonation or explosive
decomposition or reaction at standard temperature and
It is a known forbidden substance or a class A or B
It is a material that contains or degrades into toxic
components in concentrations that pose a potential
hazard to the environment or to the public health and
that may be fatal to human in low doses.
HAZARDOUS WARNING MARKINGS
Specific hazards can be determined at a glance by
referring to warning markings and labels that identify
hazardous materials. Hazardous warning markings and
labels are necessary to show clearly the hazardous
nature of the contents of packages or containers at all
stages of storage, handling, use, and disposal. When unit
packages (marked packages that are part of a larger
container) are removed from shipping containers, the
continuity of the specific hazard warning must be
preserved. This is normally done by applying the
appropriate identifying hazardous label to the hazardous
material container or package.
The Department of Transportation (DOT) labeling
system, shown in figure 7-3, is a diamond-shaped
symbol segmented into four parts. The upper three parts
reflect hazards relative to health, fire, and reactivity. The
lower part reflects the specific hazard that is peculiar to
The four specific hazards that the labels are
designed to illustrate areas follows:
Health Hazard - the ability of a material to either
directly or indirectly cause temporary or permanent
injury or incapacitation.
Fire Hazard - the ability of the material to burn
when exposed to a heat source.
Reactivity Hazard - the ability of a material to
release energy when in contact with water. This term can
be defined as the tendency of a material, when in its pure
state or as a commercially produced product, to
vigorously polymerize, decompose, condense, or
Figure 7-3.Hazardous code chart.