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Commercial High Explosives
An explosive which supports a detonation wave.
High explosives are also defined as an explosive substance or mixture which
invariably detonates when initiated, irrespective of the ambient condition of
confinement (i.e. in the open).
High explosives are those materials that undergo detonation without
confinement, are compounds, initiated by shock, the reaction within the
product is supersonic, and has a high brisance.
1. Primary Explosives
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Primary Explosive, a sensitive explosive which nearly always detonates by
single ignition from such means as spark, flame, impact and other primary
heat sources of appropriate magnitude.
Primary explosives can detonate by the action of a relatively weak mechanical
shock or by a spark. If used in the form of blasting caps (detonator), they
initiate the main explosive. They are also filled in percussion caps mixed withfriction agents and other components.
An initiating explosive must be highly brisant and must have a high triggering
velocity. The most important primary explosives are mercury fulminate, lead
azide, lead trinitroresorcinate, silver azide, diazodinitrophenol, and tetrazene,
which is used as an additive in primers. Initiating charges must be
transported only if they are already pressed into capsules. The latter are
usually made of aluminum, and sometimes of copper, white plastic capsules
are used for special purposes.
Primary explosives, have a low deflagration to detonation transition, and go
from burning to detonation very quickly. They differ as to sensitivity and the
shock given off. Primary explosives are reactive to different materials, care
should be taken when handling primarys that are in the natural state.
Generally speaking, they will not be found in the raw form.
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a. Lead Azide
UsesManufacture of detonators.
Properties:
Excellent initiating agent for high explosives, more efficient than mercury
fulminate.
Generally covered with Lead Styphnate for sensitivity.
Used as intermediate charge.
Good initiator for sensitive booster charges, RDX, PETN, Tetryl
Reactive to copper in the presence of moisture. Formation of copper azide,
which is extremely sensitive.
Color, white to buff with rounded aggregates.
VOD: 16,745 ft/sec.
b. Lead Styphnate
UsesManufacture of detonators
Properties:
Lead styphnate is a poor initiator, but it is easily ignited by fire or by a static
charge.
Used as priming layer which causes lead azide to explode from a flash.
ReddishBrown crystals.
VOD: 17,000 ft/sec
c. Mercury Fulminate
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Mercury Fulminate appears to have been prepared for the first time by
Hohann Kunckel von Lowenstern. (1630 - 1703) The preparation and
properties of mercury fulminate were described in much detail by Edward
Howard in 1800 in a paper presented to the Royal Society of London.
Preparation of Mercury Fulminate is carried out by a process essentially thesame as described by Howard.
UsesManufacture of detonators
Properties:
Used as a base charge in the past.
Not used extensively
Color is WhiteGrey or Light Grey with a yellow tint.
VOD: 14,780 ft/sec
d. Other Primary Initiating
There are a variety of other primary initiating explosives, however, they
generally will not be found in the "raw" form due to the sensitivity of the
product. They will, generally, found as components in blasting caps
(detonators)
Other examples include: Lead Salts of Picric Acid, Nitrogen Sulfide, Copper
Fulminate, Chlorates with Red Phosphorus, Tetrazene, and DDNP
(Diazodinitrophenol)
2. Secondary High Explosives
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Secondary High Explosives are those explosives which are relatively
insensitive, in comparison to primary explosives and are insensitive to shock,
friction, or heat. They are, however cap or booster sensitive and are classified
as High Explosives.
It would not be worth taking the time to discuss Secondary High Explosives
without spending some time discussing the history and the impact that
Nitroglycerin and Nobel had on the development of explosives.
a. Nitroglycerin (NG)
Nitroglycerin was first prepared late in the year 1846 or early in 1847 by the
Italian chemist Ascanio Sobrero (18121888) who was at the time professor
of Applied Chemistry at the University of Torino. Sobrero, was authorized to
practice medicine and had studied in Paris and Giessen, returning to Torino
in 1845 where he equipped a laboratory. The earliest printed account of
nitroglycerin appears in a letter which Soberro wrote to Pelouze and which
Pelouze caused to be published in LInstitut of February 15, 1847. In the same
month Sobero presented to the Academy of Torina a paper in which he
described nitroglycerin, nitromannite, and nitrated lactose. Later in the year
he presented another paper before the chemistry section of the Ninth Italian
Scientific Congress at Venice.
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Sobero found that , if concentrated nitric acid or strong mixed acid is added to
glycerin, a violent reaction ensues and red fumes are evolved, but that, if
syrupy glycerin is added to a mixture of sulfuric acid and nitric acid, with
strict controls the results are entirely different. The glycerin dissolves, and the
solution when poured into water gives an oily precipitate of nitroglycerin.
For many years Sobrero kept in his laboratory and guarded jealously a
sample of the original nitroglycerin which he had prepared in 1847. In 1886
he washed this material with a dilute solution of sodium bicarbonate and took
it to the Nobel-Avigliana factory, of which he was a consultant, where he gave
verbal testimony of its authenticity and where it has since been stored in one
of the magazines.
Nitroglycerin was the first, and is still one of the most widely produced nitrate
ester. It is used in dynamites, nitroglycerine is absorbed in fine wood meal orother powdered absorbent. This process prevents the microbubbles from
forming and stabilizes the liquid. The nitroglycerine is also thickened or
gelantinized by the addition of a small percentage of nitrocellulose. This
process assists in preventing "weeping" (exhuding) or settling out of the
absorbent material. Because settling does occur, boxes of stored nongelled
dynamites are turned over at regular intervals to reverse the settling flow.
Uses: Nitroglycerin is one of the most important and most frequently used
components of explosive materials, together with nitroglycol, it is the major
component of gelatinous industrial explosives. In combination withnitrocellulose and stabilizers, it is the principal component of powders and
solid rocket propellants.
Properties
Odor is not offensively pungent.
Color, clear, as light as possible, darker colors have impurities.
Slightly oily to the touch
Unstable and dangerous to handle.
Very sensitive to shock and when the temperature is increased it is more
sensitive.
Flammable, and when heated as a result of fire it will detonate.
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Vapors cause a sever and persistent headache.
Used as a Vaso dilator.
VOD: 25,000 ft/sec
b. Dynamite
Nobel, having discovered a way to reliably initiate nitroglycerin, knew that the
extreme sensitivity and difficulty in handling the liquid were very serious
problems. Dynamite and the fulminate blasting cap both resulted from Alfred
Nobels effort to make nitroglycerin more safe and more convenient to use.
Having discovered that nitroglycerin is exploded by the explosion of a small
firecracker-like device filled with black powder, he tried the effect of mixing
the two materials and in 1863 was granted a patent which covered the use of a
liquid explosive, such as nitroglycerin or methyl or ethyl nitrate, in mixture
with gunpowder in order to increase the effectiveness of the latter. Theamount of the liquid was limited by the requirement that the mixtures should
be dry and granular in character. The explosives were supposed to be
actuated by fire, like black powder, but the liquid tended to slow down the
rate of burning and they were not notably successful. The same patent also
covered the possibility of substituting a part of the saltpeter with
nitroglycerin. Because this substance is insoluble in water and non-
hygroscopic, it acts as a protective covering for the salt and makes the use of
sodium nitrate possible in the mixtures.
Nobels, next patent, granted in 1864, related to improvements in themanufacture of nitroglycerin and to the exploding of it by heating or by
means of a detonating charge. He continued his experiments and in 1867 was
granted a patent for an explosive prepared by mixing nitroglycerin with a
suitable nonexplosive porous absorbent such as charcoal or siliceous earth.
The resulting material was much less sensitive to shock than nitroglycerin and
known as dynamite, and was manufactured and sold under the name "Nobels
Safety Powder". The absorbent which was finally chosen as being most
satisfactory was diatomaceous earth or kieselguhr. Nobel believed that
dynamite could be exploded by a spark or by fire if it was contained closely,
but preferred to explode it under all conditions by means of a special exploder
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or cap containing a strong charge of mercury fulminate, crimped tightly to the
end of the fuse in order that it might detonate with more strength. He stated
that the form of the cap might be varied greatly, but that its action depended
upon the sudden development of an intense pressure or shock.
Prior to the issue of the patent for dynamite, production had begun in the San
Francisco area. Within the next few years numerous plants were built,
primarily concentrated in the San Francisco region in the west and New
Jersey in the east. The original manufacturers were most entrepreneurial
businessmen, with no prior connection to the explosives (black powder)
industry. Soon, however, the dynamite industry came under the domination of
the DuPont Company, but this monopoly of explosives manufacturing ended
with U. S. Government ordering its breakup under the federal antitrust laws.
The result was the establishment of the Atlas Powder Company and the
Hercules Powder Company as competitors to DuPont.
The dynamite industry flourished until the late 1950s when the US had 34
operating plants. At about that time, modern blasting agents came into wide
usage and began to replace packaged high explosives. As of 1996, only one
dynamite plant remained in operation on the North American continent.
Deteriorated Dynamites or Exhuded or Crystalline
The nitroglycerin used in dynamites is also thickened or gelatinized by the
addition of a small percentage of nitrocellulose. This helps prevent the liquid
from "weeping" or separating from the absorbent. Because settling does
occur, boxes of stored nongelled dynamites are turned over at regular
intervals to reverse the settling flow. However, old and deteriorated dynamite
may have exhuded allowing the liquid explosive to seep through the waximpregnated kraft paper.
Uses - Construction, Road Building, Quarrying, Mining, Destruction
Ingredients:
Nitroglycerine (NG), Ethylene Glycol Dinitrate (EGDN), Ammonium Nitrate
(AN), Nitrocellulose (NC), Sodium Nitrate (SN), Carbonaceous Fuel (wood
pulp & ground shells), Sulfur.
Types:
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(a.) Straight Dynamite: NG & EGDN
(b.) Ammonia Dynamite: NG, EGDN & AN
(c.) Gelatin Dynamite: NG, EG DN & NC
(d.) Ammonia Gelatin Dynamite: NG, EGDN, AN, & NC
(e.) Permissible Ammonia and Gelatin Dynamites: Added Salt
Properties:
Excellent water resistance, NG & EGDN pulled out by gravity, NG headache,
expensive, easy to initiate, detonator sensitive, shock sensitive.
VOD: 8,000 to 22,000 ft/sec.
Packaging:
(a). Diameter - 7/8" to 3 "
(b). Length - 6" to 20"
(c). Weight - 2 to 6 pounds
(d). Packaging Materials:
Spiral Wound Paper Tubes
Spiral Wound Manila Paper Shells
c. Ammonium Nitrate
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J. R. Glauber first synthesized ammonium nitrate in 1659 by combining nitric
acid and ammonium carbonate. Ammonium nitrate, which Glauber named
"Nitrum Flammans", occurs in nature only rarely and then in very small
amounts. Today this chemical compound has two widely recognized and
diverese uses:
An important fertilizer for the agricultural industry
The basic ingredient of most commercial explosives, where it serves as an
oxidizer.
In 1867, two Swedish chemists, C. J. Ohlsson and J. H Norrbin, patented an
explosive, called ammoniakrut, which consisted of ammonium nitrate either
alone or in mixture with charcoal, sawdust, naphthalene, picric acid,
nitroglycerin, or nitrobenzene. Theoretical calculations had shown that largequantities of heat and gas were given off by the explosions of these mixtures.
The proportions of the materials were selected in such a manner that all of the
carbon should be converted to carbon dioxide and all the hydrogen to water.
Some of these explosives were difficult to ignite and to initiate, but the trouble
was remedied by including some nitroglycerin in their compositions and by
firing them with fulminate detonators. They were used to some extent in
Sweden. Nobel purchased the invention from his fellow-countrymen early in
the 1870s, and soon afterwards took out another patent in connection with it,
but still found that the hygroscopicity of the ammonium nitrate created
several problems. He was not able to deal satisfactorily with the problemsuntil after the invention of gelatin dynamite.
1935, experimentation began on blasting with a mixture of prilled fertilizer
grade ammonium nitrate (FGAN) and carbon black or cold dust at a surface
coal mine in Indiana. The mixture was packaged in large tubes and was
primed with 20 pound charges of dynamite. It is popularly believed that this
product was developed because of publicity about the 1947 Texas City disaster
in which two ships laden with ammonium nitrate fertilizer blew up. In
actuality, that explosion occurred with grained AN, not prilled, and in 1947
the time was not correct for a new blasting material. The success of the
Indiana experiments was that prills had become commonly available (all
fertilizer production in the US having converted to prilling by 1948), and that
dry drilling of large diameter blastholes in the surface mines was becoming
the norm. The person responsible for the product was Bob Akre of the
Maumee Collieries, and the product was called Akremite. Within a very short
period of time after the May 1955 experiment other mines began using prills
mixed with common #2 diesel fuel, and the name ANFO was soon applied.
Prills: Prills denote the ammonium nitrate pellets obtained by cooling freefalling droplets of the molten salt in so called prill towers. By special
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processing, they can be porous and capable of absorbing a certain percentage
of liquid hydrocarbons. Under the same name, "Prills" also the ready made
ANFOexplosive marketed.
Uses: Ammonium nitrate is the most important raw material in the
manufacture of industrial explosives. It serves also as constituent in rocket
propellants, in the capacity of a totally gasifiable oxygen carrier.
Properties
Hygroscopic and very soluble in water.
Product shows great tendency to cake.
Marketed as dense prills and as porous prills.
Colorless crystals
d. ANFO (Ammonium Nitrate and Fuel Oil)
Ammonium nitrate explosives are mixtures of ammonium nitrate with carbon
carries such as wood meal, oils or coal and sensitizers such as nitroglycol or
TNT and dintroluene. They also may contain aluminum powder to improve
the strength. Such mixtures can be cap-sensitive. The non-cap-sensitives are
classified as blasting agents.
Mixtures of porous ammonium nitrate prills with liquid hydrocarbons, loaded
un-cartridged by free pouring or by means of air loaders, are extensively used
under the name NAFO Blasting Agents.
Uses - Construction, Road Building, Quarrying
Ingredients: Prilled Ammonium Nitrate and Fuel Oil
Properties:
A blasting agent which requires a booster for initiation. Very hygroscopic.
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Available in bulk or in bags. Requires simplistic facilities for production and
easily improvised for illegal/terrorist application.
VOD: 12,000 - 15,000 ft/sec.
Packaging: Usually in 50 pound paper/plastic bags.
e. PETN (Pentaerythrite Tetranitrate)
1901, PETN is the most stable and least reactive of the explosive nitric esters.
It is also one of the most powerful and brisant explosive, with good stability.
Uses: It is used in high-efficiency detonators, detonating cords, and to produce
boosters. PETN can also be incorporated into gelatinous, industrial explosives.
Properties
White to light gray in color.
May be exploded if subjected to severe shock. A shock from a carpenters
hammer on a floor or other solid object may cause initiation.
Insoluble in water, sparingly soluble in alcohol, ether, and benzene, and
soluble in acetone and methyl acetate.
VOD 27,200 ft/sec.
f. RDX (Clclotrimethylenetrinitramine, Cyclonite)
The name cyclonite was given to this explosive by Clarence J. Bain because of
its cyclic structure and its cyclonic nature. The Germans call it Hexogen, the
Italians T4.
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Today, Cyclonite is probably the most important high brisance explosive. Its
brisant power is high, owning to its high density and high detonation velocity.
It is relatively insensitive as compared to PETN which has similar strength.
RDX is also used as a medicine, under the name of methenamine, used for the
control of urinary tract infections, also used in the manufacturer of plastics,
and as an accelerator for the vulcanization of rubber.
Uses: Manufacture of boosters, detonating cord, detonators, and placed in a
plastic binder.
Properties
White crystalline solid or red depending on use. If used in detonating cord it
will be red to pink.
High brisance
VOD 27,394 ft/sed
g. Pentolite
Pentolite is a mixture of 50% PETN and 50% TNT.
Uses:
Manufacture of cast boosters.
VOD 24,600 ft/sec
h. Binary Explosives
Binary or two component explosives are blasting explosives that are formed
by mixing or combining two commercially manufactured, prepackaged
chemical ingredients, consisting of oxidizers, flammable liquids or solids, or
similar ingredients which individually are not classified as explosives but
which are when mixed or combined, form a detonable mixture.
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The unmixed ingredients of this type of explosive are generally not subject to
the transportation requirements applicable to explosives, thus they may be
transported in less than required quantities without a placard.
Generally, this type of explosive is used for intermittent or limited usage due
to mixing and time requirements.
Kine-Pak and Kine-Stick are a mixture of ammonium nitrate and nitro
methane.
Uses: Booster, Rock Buster, Demolition
Ingredients: Crushed Ammonium Nitrate and Nitromethane (dyed red)
VOD: 14,000 ft/sec.
Packaging:
2 pound to 1 pound clear & colored plastic tubes & cylindrical containers
Some manufacturers may pre-mix ingredients
Manufacturers
XPLO Corporation Atlas Powder Company
i. Boosters
The development of non-cap sensitive and insensitive explosives for civilian
and military use created the need for compact high detonation pressure
boosters. NG based versions of boosters were available, but were in less-than-
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convenient packages and did not fit the overall trend toward bore holes
containing non-nitroglycerin based explosives.
During the 50s and 60s there was an availability of low cost military high
explosives that had been released to the commercial market. The availability
of these products and the need for non-NG based boosters prompted the
development of the cast booster.
There are several forms of boosters available and they have varying
properties and sensitivities.
Cast Boosters are cap-sensitive explosives that typically contain the high
explosive trintotoluene (TNT) as the casting material. Different molecular
explosives are mixed into the melted TNT and impart additional energy
and/or sensitivity to the booster. Molecular explosives are energetic materialsthat contain all of the elements for a detonation reaction in the molecules of
the explosives.
Pentolite Boosters
A mixture of PETN and TNT.
Composition B Boosters
Boosters that contain the military explosive composition "B" (RDX), and TNT
with wax added to the mixture. Many of the boosters that are generically
given this name are diluted with additional amounts of TNT.
Torpex Boosters
Mixture of RDX, TNT, and aluminum.
Amatol/Sodatol Booster
Pentolite or Composition "B" boosters that contain amounts of ammonium
nitrate or sodium nitrate. These are called amatol or sodatol, respectively.
Tetryl or Tetrytol
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Sensitive mixtures of tetryl or tetryl and TNT.
Cast boosters can be initiated by a detonator or detonating cord.
Uses - To initiate blasting agents
Ingredients:
(1.) TNT
(2.) PETN
(3.) Binary
(4.) Pentolite (TNT & PETN)
Properties:
Used to amplify the effects of a detonator or detonating cord to a degree that
it will initiate a less sensitive explosive, usually a blasting agent.
Three forms are available: Cast, pliable and binary. Normally cylindrical in
shape and designed to be initiated with a detonator or detonating cord.
VOD: 16,000 - 24,000 ft/sec.
Packaging:
(1.) Diameter - 2" to 5"
(2.) Length - 1 2" to over 5"
(3.) Weight - 1 oz. to 2 pounds
Packaging Materials:
Heavy paper tubes of various colors
Plastic tubes of various colors
Slip on boosters, which are pliable, require no packaging
Metal tube
j. Detonating Cord
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Detonating cords, all detonate, with the primary use is as a link.
In nonelectric blasting, detonating cord was developed after safety fuse. A
variety of detonating cord had a military application in Europe in the 1870s.
A civilian application introduced in 1902 when Cordeau, in Europe,
introduced a tin tube filled with picric acid as an initiation system for mining.
A different type of Cordeau, with a lead tube and TNT, was introduced in the
US in 1913. Todays detonating cord, PETN in a fabric braid was introduced
in 1938.
In electric blasting, the first cords were virtually instantaneous (detonationrate of the cord and the length provided the delay); delay connectors were
introduced in the 1950s. Additional delays were developed subsequently.
a. Uses - To link multiple shots, initiate boosters and shock tube, and
demolition.
Det Cord Video
b. Ingredients:
To identify the type of explosive that is used, look at the cross section.
(1.) PETN - White in color
(2.) RDX - Dyed pink
(3.) HMX - Dyed pink in color
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c. Properties:
Detonating cord is strong, flexible "cord " with a high explosive core. The
strength (explosive force) is determined by the type/quantity of explosive
contained in the core load which is measured in grains per foot (gn/ft). The
core load ranges from 4 gn/ft to 400 gn/ft in well over 100 different
brands/types. Initiated with a detonator, other detonating cord or main
charge explosives.
To positively identify if in fact you have detonating cord or safety fuse, look at
the cross section. If it is white or pink, then it is detonating cord. If it is black
or gray, then it is safety fuse.
d. VOD: 22,000 - 27,000 ft/sec. or about 4 miles/sec.
e. Construction:
Detonating cord is constructed with various types/quantities and colors of
natural and man made fibers and plastic. It can usually be identified as to its
manufacturer, brand and core load from the colors and manufacturing
characteristics observed on the exterior of each length of cord. However, with
the use of colored plastics as the final covering, some detonating cords can be
improperly identified.
C. Military Explosives
1. TNT Demolition Blocks
TNT, was first prepared by Wilbrand in 1863 and on an industrial scale in
Germany in 1891. Beginning in 1901 Germany started to manufacture TNT
on a commercial scale, and in about 1902 the German Army adopted it as
standard filling for shells. Other countries slowly followed the German
example.
TNTs stability, which permits melt-pour loading into munitions, stability in
storage under all temperature conditions, and use in other explosive mixtures
has made it the most widely used military explosive.
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Uses: Used in all types of military ammunition including aircraft bombs,
artillery projectiles, mines, grenades, etc.
Properties:
a. Light Yellow in color also to light gray.
b. It is one of the least sensitive explosives and in the form of demolition
blocks, it is virtually bullet safe.
c. Not affected by moisture or sea water.
d. When the flame of a match is applied, TNT will burn. It will not normally
detonate unless very large quantities are burned in one pile and at one time.
VOD: 22,637 ft/sec.
Packaging:
a. , , and 1 pound blocks.
b. pound block is cylindrical, within a cardboard tube with metal ends, OD
Green with a single yellow stripe in the middle of the container.
c. pound and 1 pound is rectangular, cardboard wrapped with metal ends,
OD Green.
d. Containers come with a predrilled cap well.
2. Composition C4
During World War II, the British used a plastic demolition explosive that
could be shaped by hand and had great shattering power. As standardized by
the US, it was designated as composition C and contained 88.3 percent RDX
and 11.7 of a nonexplosive oily plasticizer.
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Composition C was replaced by C-2, which contained 80 percent RDX and 20
percent explosive plasticizer. This explosive plasticizer was composed of
mononitrotoluene.
C-2 was replaced by C-3, which contains 77% (+/- 2%) RDX and 23% (+/-
2%) explosive plasticizer.
C-3 has been replaced by C-4 because of its hardening, volatility, and its
hygroscopicity. C-4 contains, RDX, Polyisobutylene, Motor Oil, and Di (2-
ethylhexyl) sebacate.
Uses: M5A1 Block Demolition Charge as well as other charges (see below)
Properties: Non-odorous white to light brown, putty-like material.
VOD: 26,377 ft/sec.
3. M112 Demolition Block
Block demolition charge M112 is plastic explosive. This charge is ideally
suited for cutting charges, as the adhesive backing allows the charge to be
attached to any relatively flat, dry surface above freezing (32 degrees F.) The
explosive may also be cut and/or removed from the mylar wrapper and hand
formed as desired to suit the target.
Uses: Cutting charge.
Explosive: Composition C4
Packaging
Gray or OD with yellow markings
1 pound block
Mylar film used for covering.
Adhesive backing
4. Sheet Explosive
Detasheet (DuPont) is a flexible high explosive developed by DuPont. Sheet
explosives have both military and commercial applications. It is composed of
integral mixture of PETN and a binder. This explosive is flexible over a wide
range of temperatures It is waterproof and available in a variety of extrudedshapes and in sheets and cords.
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Detasheet
Detasheet "A", the commercial form is 85% PETN is red and detonator
sensitive.
Flex-X
Flex-X, (Detasheet "B") is the military variety and is colored OD green for
identification and contains 63% PETN. However, it should be noted that some
manufacturers will use RDX as the explosive material.
Use:
Sheet explosives are designed for use as a cutting, breaching, or cratering
charge, and especially for use against steel targets. The sheets of explosives
may be quickly applied to irregular and curved surfaces, and are easily cut to
any desired dimension.