(2) The storage compatibility groups consist of 12 lettered groupings ranging from A thru H, J, K, L and
S. The groups are explained below.
Group A - Initiating explosives. These are the most hazardous items due to their sensitivity to
heat, shock and/or friction. Group A includes wet lead azide, lead styphnate, mercury
fulminate, tetracene and dry PETN. These explosives are used in initiators, detonators, and
Group B - Initiating devices and detonators. These items contain Group A explosives and may
have Group D explosives in small quantities. Examples are military blasting caps and/or
Group C - Bulk propellants and propelling charges. When these items are ignited, they may
burn or detonate. Examples are: Single-, double-, triple-base and composite propellants; solid
propellant rocket motors; and ammunition with inert projectiles.
Group D - Black powder, bulk high explosives, and ammunition containing HE without a fuze or
means of initiation. Examples are: Bulk TNT, Comp B, wet RDX and PETN, bombs,
projectiles, torpedo warheads, and saluting charges and fuzes with two or more safety
Group E - Ammunition containing HE without a fuze, but with its propelling change. This
includes artillery ammunition, rockets, and guided missiles.
Group F - Ammunition containing HE with its own fuze and with or without a propelling change.
Examples are items initiated by an inline explosive train (fuze), i.e., grenade fuzes, grenades,
and sounding devices.
Group G - Fireworks, illuminating, incendiary, smoke including HC, FS and lachrymatory (tear
gas) munitions, and flammable liquids or gels.
Group H - Ammunition containing white phosphorus (WP) or plasticized white phosphorus
(PWP), sodium, and other pyrohoric materials. These items are spontaneously ignited when
exposed to the atmosphere (air) for WP, water for sodium, and by abrasion for pyrohoric
materials (anti-tank, kinetic energy projectiles).
Group J - Ammunition containing flammable liquids or gels, with or without explosives.
Examples are: fire bombs (thickened fuels) and napalm munitions/agents.
Group K - Ammunition containing toxic chemical agents, with or without explosives. This
includes all munitions with toxic and incapacitating (CS) agents. The storage containers and
bulk chemicals are included in this group. See Figures 14 and 16 for these items.
Group L - Ammunition not included in other compatibility groups. Any item having
characteristics or properties that do not permit storage with other types of ammunition or
explosives. Examples are prepackaged liquid fueled rocket engines, fuel-air explosive (FAE)
munitions, TPA and Triethyl Aluminum (TEA), and damaged or suspect ammunition of any