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Part of the responsibility of being a reloader
includes the safe handling, storage and use of gun powder. It is vital
that you practice all the recommended precautions before, during and
after the use of our products. Below are some of the methods we advise
you follow when handling gun powder.
Storage
Ammunition handloading has become increasingly popular in recent years.
This page discusses properties of smokeless powder and offers recommendations
for its storage. This information is intended to increase the knowledge
of all concerned individuals and groups regarding smokeless powder.
The statements and recommendations made are not
intended to supersede local, state, or Federal regulations. Proper authorities
should be consulted on regulations for storage and use of smokeless powder
in each specific community.
A leaflet entitled "SPORTING AMMUNITION
PRIMERS: PROPERTIES, HANDLING, & STORAGE FOR HAND LOADING" supplements
this page on smokeless powder.
Properties
of Smokeless Powders
Smokeless powders, or propellants, are essentially mixtures of chemicals
designed to burn under controlled conditions at the proper rate to propel
a projectile from a gun.
Smokeless powders are made in three forms:
1. Thin, circular flakes or wafers
2. Small cylinders
3. Small spheres
Single-base smokeless powders derive their main source of energy from
nitrocellulose.
The energy released from double-base smokeless powders is derived from
both nitrocellulose and nitroglycerin.
All smokeless powders are extremely flammable; by design, they are intended
to burn rapidly and vigorously when ignited.
Oxygen from the air is not necessary for the combustion of smokeless
powders since they contain sufficient built-in oxygen to burn completely,
even in an enclosed space such as the chamber of a firearm.
In effect, ignition occurs when the powder granules are heated above
their ignition temperature. This can occur by exposing powder to:
1. A flame such as a match or primer flash.
2. An electrical spark or the sparks from welding, grinding, etc.
3. Heat from an electric hot plate or a fire directed against or near
a closed
container even if the powder itself is not exposed to the flame.
Informaiton Provided
by S A A M I
Sporting Arms and Ammunitaions Manufacturers' Institute, Inc.
FLINTLOCK RIDGE OFFICE CENTER, 11 MILE HILL ROAD
NEWTOWN, CT 06470-2359
When smokeless powder burns, a great deal of gas at high temperature
is formed. If the powder is confined, this gas will create pressure
in the surrounding structure. The rate of gas generation is such, however,
that the pressure can be kept at a low level if sufficient space is
available or if the gas can escape.
In this respect smokeless powder differs from blasting agents or high
explosives such as dynamite or blasting gelatin, although smokeless powder
may contain chemical ingredients common to some of these products.
High explosives such as dynamite are made to detonate, that is, to change
from solid state to gaseous state with evolution of intense heat at such
a rapid rate that shock waves are propagated through any medium in contact
with them. Such shock waves exert pressure on anything they contact,
and, as a matter of practical consideration, it is almost impossible
to satisfactorily vent away the effects of a detonation involving any
appreciable quantity of dynamite.
Smokeless powder differs considerably in its burning characteristics
from common "black powder."
Black powder burns essentially at the same rate out in the open (unconfined)
as when in a gun.
When ignited in an unconfined state, smokeless powder burns inefficiently
with an orange-colored flame. It produces a considerable amount of light
brown noxious smelling smoke. It leaves a residue of ash and partially
burned powder. The flame is hot enough to cause severe burns.
The opposite is true when it burns under pressure as in a cartridge fired
in a gun. Then it produces very little smoke, a small glow, and leaves
very little or no residue. The burning rate of smokeless powder increases
with increased pressure.
If burning smokeless powder is confined, gas pressure will rise and eventually
can cause the container to burst. Under such circumstances, the bursting
of a strong container creates effects similar to an explosion.
For this reason, the Department of Transportation (formerly Interstate
Commerce Commission) sets specifications for shipping containers for
propellants and requires tests of loaded containers - under actual fire
conditions - before approving them for use.
When smokeless powder in D.O.T. approved containers is ignited during
such tests, container seams split open or lids pop off - to release gases
and powder from confinement at low pressure.
How
to Check Smokeless Powder for Deterioration
Although modern smokeless powders are basically free from deterioration
under proper storage conditions, safe practices require a recognition
of the signs of deterioration and its possible effects.
Powder deterioration can be checked by opening the cap on the container
and smelling the contents. Powder undergoing deterioration has an irritating
acidic odor. (Don't confuse this with common solvent odors such as alcohol,
ether and acetone.)
Check to make certain that powder is not exposed to extreme heat as this
may cause deterioration. Such exposure produces an acidity which accelerates
further reaction and has been known, because of the heat generated by
the reaction, to cause spontaneous combustion.
Never salvage powder from old cartridges and do not attempt to blend
salvaged powder with new powder. Don't accumulate old powder stocks.
The best way to dispose of deteriorated smokeless powder is to burn it
out in the open at an isolated location in small shallow piles (not over
1" deep). The quantity burned in any one pile should never exceed
one pound. Use an ignition train of slow burning combustible material
so that the person may retreat to a safe distance before powder is ignited.
Considerations
for Storage of Smokeless Powder
Smokeless powder is intended to function by burning, so it must be protected
against accidental exposure to flame, sparks or high temperatures.
For these reasons, it is desirable that storage enclosures be made of
insulating materials to protect the powder from external heat sources.
Once smokeless powder begins to burn, it will normally continue to burn
(and generate gas pressure) until it is consumed.
D.O.T. approved containers are constructed to open up at low internal
pressures to avoid the effects normally produced by the rupture or bursting
of a strong container.
Storage enclosures for smokeless powder should be constructed in a similar
manner: 1. Of fire-resistant and heat-insulating materials to protect
contents from external heat. 2. Sufficiently large to satisfactorily
vent the gaseous products of combustion which would result if the quantity
of smokeless powder within the enclosure accidentally ignited.
If a small, tightly enclosed storage enclosure is loaded to capacity
with containers of smokeless powder, the enclosure will expand or move
outwards to release the gas pressure - if the powder in storage is accidentally
ignited.
Under such conditions, the effects of the release of gas pressure are
similar or identical to the effects produced by an explosion.
Hence only the smallest practical quantities of smokeless powder should
be kept in storage, and then in strict compliance with all applicable
regulations and recommendations of the National Fire Protection Association
(scroll down to read).
Recommendations
for Storage of Smokeless Powder
STORE IN A COOL, DRY PLACE.
Be sure the storage area selected is free from
any possible sources of excess heat and is isolated from open flame,
furnaces, hot water heaters, etc. Do not store smokeless powder where
it will be exposed to the sun's rays. Avoid storage in areas where mechanical
or electrical equipment is in operation. Restrict from the storage areas
heat or sparks which may result from improper, defective or overloaded
electrical circuits.
DO NOT STORE SMOKELESS POWDER IN THE SAME AREA WITH SOLVENTS, FLAMMABLE
GASES OR HIGHLY COMBUSTIBLE MATERIALS.
STORE ONLY IN DEPARTMENT OF TRANSPORTATION APPROVED
CONTAINERS.
Do not transfer the powder from an approved container
into one which is not approved.
DO NOT SMOKE IN AREAS WHERE POWDER IS STORED
OR USED. Place appropriate "No Smoking" signs in these areas.
DO NOT SUBJECT THE STORAGE CABINETS TO CLOSE
CONFINEMENT. STORAGE CABINETS SHOULD BE CONSTRUCTED OF INSULATING MATERIALS
AND WITH A WEAK WALL SEAMS OR JOINTS TO PROVIDE AN EASY MEANS OF SELF-VENTING.
DO NOT KEEP OLD OR SALVAGED POWDERS. Check old
powders for deterioration regularly. Destroy deteriorated powders immediately.
OBEY ALL REGULATIONS REGARDING QUANTITY AND METHODS
OF STORING. Do not store all your powders in one place. If you can, maintain
separate storage locations. Many small containers are safer than one
or more large containers.
KEEP YOUR STORAGE AND USE AREA CLEAN. Clean up
spilled powder promptly. Make sure the surrounding area is free of trash
or other readily combustible materials
------------------------------------------------------------------------
10-3 SMOKELESS PROPELLANTS. 10-3.1 Quantities of smokeless propellants
not exceeding 25 LB (11.3kg), in shipping containers approved by the
U.S. Department of Transportation, may be transported in a private
vehicle.
10-3.2 Quantities of smokeless propellants exceeding 25 lb (11.3kg) but
not exceeding 50 lb (22.7 kg), transported in a private vehicle, shall
be transported in a portable magazine having wood walls of at least 1-inc.
(25.4-mm) nominal thickness.
10-3.3 Transportation of more than 50 lb (22.7 kg) of smokeless propellants
in a private vehicle is prohibited.
10-3.4 Commercial shipments of smokeless propellants in quantities not
exceeding 100 lb. (45.4kg) are classified for transportation purposes
as flammable solids when packaged according to U.S. Department of Transportation
Hazardous Materials Regulations. (Title 49, Code of Federal Regulations,
Park 173.197a), and shall be transported accordingly.
10-3.5 Commercial shipments of smokeless propellants exceeding 100 lb
(45.4 kg) or not packaged in accordance with the regulations cited in
10-3.4 shall be transported according to the U. S. Department of Transportation
regulations for Class B propellant explosives.
10-3.6 Smokeless propellants shall be stored in shipping containers specified
by U. S. Department of Transportation Hazardous Materials Regulations.
10-3.7 Smokeless propellants intended for personal use in quantities
not exceeding 20 lb (9.1 kg) may be stored in original containers in
residences. Quantities exceeding 20 lb (9.1 kg), but not exceeding 50
lb (22.7 kg), may be stored in residences if kept in a wooden box or
cabinet having walls or at least 1-inc. (25.4-mm) nominal thickness.
10-3.8 Not more than 20 lb (9.1 kg) of smokeless propellants, in containers
of 1-lb (0.45-kg) maximum capacity, shall be displayed in commercial
establishments.
10-3.9 Commercial stocks of smokeless propellants should be stored as
follows:
(a) Quantities exceeding 20 lb (9.1 kg), but not exceeding 100 lb (45.4
kg), shall be stored in portable wooden boxes having walls of at least
1-in (25.4-mm) thickness.
(b) Quantities exceeding 100 lb (45.4 kg), but not exceeding 800 lb (363
kg), shall be stored in non portable storage cabinets having walls of
at least 1-in (25.4-mm)thickness. Not more than 400 lb (181 kg) may be
stored in any one cabinet and cabinets shall be separated by a distance
of at least 25 ft (7.63 m) or by a fire partition having a fire resistance
of at least 1 hour.
(c) Quantities exceeding 800 lb (363 kg), but not exceeding 5,000 lb
(2268 kg), may be stored in a building if the following requirements
are met:
1. The warehouse or storage room shall not be accessible to unauthorized
personnel.
2. Smokeless propellant shall be stored in nonportable storage cabinets
having wood walls at least 1 inc. (25.4 mm) thick and having shelves
with no more than 3 ft (0.92 m) separation between shelves.
3. No more than 400 lb (181 kg) shall be stored in any one cabinet.
4. Cabinets shall be located against walls of the storage room or warehouse
with at least 40 ft (12.2 m) between cabinets.
5. Separation between cabinets may be reduced to 250 ft (6.1m) if barricades
twice the height of the cabinets are attached to the wall, midway between
each cabinet. The barricades shall extend at least 10 ft (3m) outward,
shall be firmly attached to the wall, and shall be constructed of 1/4-inc.
(6.4-mm) boiler plate, 2-in. (51-mm) thick wood, brick, or concrete block.
6. Smokeless propellant shall be separated from materials classified
by the U.S. Department of Transportation as flammable liquids, flammable
solids, and oxidizing materials by a distance of 25 ft (7.63mm) or by
a fire partition having a fire resistance of at least 1 hour.
7. The building shall be protected by an automatic sprinkler system installed
accordingly to NFPA 13, Standard for the Installation of Sprinkler Systems..
(d) Smokeless propellants not stored according to (a), (b) and (c) above
shall be stored in a Type 4 magazine constructed and located according
to Chapter 6.
Reprinted with permission from NFPA495-85, Standard for the Manufacture,
Transportation, Storage and Use of Explosive Materials, (c) 1985, National
Fire Protection Association, Quincy, MA 02269. This reprinted material
is not the complete and official position of the NFPA on the referenced
subject, which is represented by the Standard in its entirety.
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