Table 12-5.Hazard Class 1 Division Designators and Types
intended use. The divisions within Class 1 and the
expected hazard for each division is listed in table 12-5.
MASS-DETONATING HAZARD MATE-
RIALS (CLASS 1, DIVISION 1). Damage from
mass-detonating hazard materials is caused by
concussion or blast or by sympathetic detonation.
Prescribed distances between piles of these materials
and between magazines containing these materials must
be maintained to minimize the possibility of
sympathetic detonation or propagation. Ammunition
and explosives that are considered mass-detonating
hazards are Hazard Class 1, Division 1.
(CLASS 1, DIVISION 2). The principal hazards for
items within this division are fragment and blast, either
individually or in combination, depending on such
factors as storage configuration, type of packing, and
quantity. The designated minimum distances are based
upon the limited range of fragments. These are the
distances that must be used for protection of inhabited
buildings and public traffic routes. Since fragment-
producing materials can be grouped according to the
range of the fragments produced, four fragment distance
categories have been established. This permits flexibil-
ity of storage. Most fragments produced by incidents in
this division will fall within one of four specified
minimum distances400, 800, 1,200, and 1,800 feet.
MASS FIRE HAZARD MATERIALS (CLASS
1, DIVISION 3). Items in this division burn
vigorously. There is little or no possibility for
extinguishing them in a storage situation. Normally,
explosions will be confined to pressure ruptures of
containers and will not produce propagating shock
waves or damaging blast overpressure beyond specified
distances. A severe fire may result from the tossing
about of burning container materials, propellant, or
other flaming debris. Toxic effects, such as burning
pyrotechnic items, will not normally extend beyond the
inhabited building distances specified for this division.
MODERATE FIRE HAZARD, NO BLAST
MATERIALS (CLASS 1, DIVISION 4). Items in
this division present a fire hazard with no blast hazard
and virtually no fragmentation or toxic hazard beyond
the fire hazard clearance specified for high-risk
materials. However, separate facilities for storage and
handling of this division should not be less than 100 feet
from other facilities. However, if the facilities are of
fire-resistive construction, they may be 50 feet from
each other. If devices containing explosives are such
that accidental ignition during storage or transport will
not cause external damage to the devices, either by fire,
smoke, heat, loud noise, or by visible damage to the
outer packaging, they are not considered Class 1 items.
These devices may be considered inert for storage
purposes and marked AMMUNITION NON-
EXPLOSIVE for transport purposes.
Certain articles within the division that contain one
ounce or less of explosives have (based on test results)
been classified as Class 1, Division 4S. These articles
may be considered inert for storage purposes, and they
are not subject to explosive transportation regulations.
Articles containing larger quantities of explosives, also
classified as Class 1, Division 4S, may be considered
inert for storage purposes. However, they must be
reviewed on an individual basis to determine whether
explosive transportation regulations are applicable.
VERY INSENSITIVE EXPLOSIVE ITEM
MATERIALS (CLASS 1, DIVISION 5). Items in
this division are considered very insensitive when not
stored or transported with other Class 1 materials. DOD
considers these items to be the same as Class 1, Division 1,
Compatibility Group D. There is very little probability
of accidental explosion or transition from deflagration
to detonation. The materials within this division are
shipped as Q-D Hazard Class 1, Division 5. They are
stored as Class 1, Division 1, Compatibility Group D.
Normally, technical manuals do not present the
hazard class, division, and compatibility group as they
are written in previous paragraphs. For example, an item
classified as Class 1, Division 5, Compatibility Group
D, is written as Class 1.5D; or for an item in Class 1,
Division 4, Compatibility Group S is written as Class 1.4S.
Figure 12-1 shows Q-D information about Class 1.1
items. As you read this paragraph, refer to figure 12-1.
Col 1 and Col 2 list the minimum and maximum