EXPLANATION OF TERMS - TM-9-1300-2770128

TM 9-1300-277

C-4 is 1.15 times more powerful than TNT (1 pound of

Firing Device-A device that causes the initiation of

Composition C-4 is equivalent to 1.15 pounds of TNT).

demolition charges either directly or through its effect on

a blasting cap, electric squib, or detonating cord. It may

Explosives Facility-Any structure or location containing

be electrical, mechanical, or electromechanical.

ammunition and explosives.

Fixed Ammunition-Includes all but small arms and

Explosives Hazard--Any condition which may result in or

rocket ammunition. Consists of cartridge case, loaded

contribute to the severity of an explosives accident or

with propellant, firmly attached to the projectile. Such

incident.

ammunition is loaded in one operation into the weapon.

Explosives Safety Distance (Quantity Distance)-The

Flameproof-Combustible materials (e.g., clothing) so

pre-scribed minimum distance between various classes

treated or coated as to decrease their burning

and quantities (net weight) of explosives and between

characteristics.

such explosives and specified exposures (inhabited

buildings, public highways, public railways, petroleum,

Flammable-Combustible material easily ignited and

aircraft, etc.) affording an acceptable degree of

which burns readily.

protection and safety.

Flammable Liquid-Any liquid, the vapor of which will

Exposed Explosives-Those actually visible (unpackaged

burn.

bulk explosives, disassembled or open components,

etc.) and that also are susceptible to initiation directly by

Fragment Distance-The limiting range of a considerable

static or mechanical spark. Explosives that create,

number of fragments from the quantity and types of

accidentally or otherwise, explosives dust or give off

explosives involved in certain explosives safety-

vapors, fumes or gases in explosive concentrations.

distance (quantity-distance) tables. (Formerly referred

to as missile distance for ammunition in 1.2-1.3 based

Field Office-An office required by operational super-

on the limiting range of a considerable number of

vision (e.g., foremen and line supervisors) in direct

fragments for the type of ammunition involved. The

support of ammunition and explosives operations.

distances do not take into account occasional fragments

which may be projected farther. For class 1.1,the

inhabited-building distance is based upon blast damage

Firebrand-A projected burning or hot fragment whose

and does not represent the distance to which some

thermal energy is transferred to a receptor.

fragments can be projected.

Fire Hazard Area-A location in which the primary, but

Fragmentation-The breaking up of the confining material

not necessarily the only hazard is that of fire, including

explosions of gas or vapor and air mixtures.

of a chemical compound or mechanical mixture when

an explosion takes place. Fragments may be complete

items, subassemblies, or pieces thereof, as well as

Fire Resistive-Structures, materials, etc., designed to

pieces of equipment or buildings containing the items.

resist fire without becoming weakened to the point of

failure.

Fuse-A slow-burning powder filled cord that carries

Fire Retardant-Generally combustible structures, mater-

flame through its length at a known and uniform rate per

ials, etc., so treated or covered as to retard ignition or

unit of length. Also known as "safety fuze", "time fuze"

spread of fire.

and "time blasting fuze."

Fire Wall/Fire Division Wall -A wall of fire-resistive con-

Fuze-(Not to be confused with fuse). A mechanical

struction designed to prevent spread of fire from one

electrical, or electromechanical device used to function

side to the other.

an explosive device such as a bomb or projectile. In

demolition work, a firing device may be termed a fuze.

B-4