C-4 (explosive)

Last updated
C-4
Exploding pumpkins 131106-F-YU668-233.jpg
Blocks of C-4 cut to size during a demo training session, showing the white plastic explosive material
TypeHigh-yield chemical explosive
Place of originUnited States
Service history
Used by United States
Wars Vietnam War
War on Terror
2022 Russian invasion of Ukraine
Production history
Designed1956
Produced1956–current
VariantsPE-4, M112
Specifications (M112)
Mass1.25 lb (0.57 kg) [1]
Length11 in (28 cm) [1]
Width2 in (5.1 cm) [1]
Height1.5 in (3.8 cm) [1]
Filling RDX
Filling weight91%
Detonation
mechanism
 PETN-based detonating cord
Blast yieldHigh

C-4 or Composition C-4 is a common variety of the plastic explosive family known as Composition C, which uses RDX as its explosive agent. C-4 is composed of explosives, plastic binder, plasticizer to make it malleable, and usually a marker or odorizing taggant chemical. C-4 has a texture similar to modelling clay and can be molded into any desired shape. C-4 is relatively insensitive and can be detonated only by the shock wave from a detonator or blasting cap.

Contents

A similar British plastic explosive, also based on RDX but with a plasticizer different from that used in Composition C-4, is known as PE-4 (Plastic Explosive No. 4).

Development

C-4 is a member of the Composition C family of chemical explosives. Variants have different proportions and plasticisers and include compositions C-2, C-3, and C-4. [2] The original RDX-based material was developed by the British during World War II and redeveloped as Composition C when introduced to the U.S. military. It was replaced by Composition C-2 around 1943 and later redeveloped around 1944 as Composition C-3. The toxicity of C-3 was reduced, the concentration of RDX was increased, giving it improved safety during usage and storage. Research on a replacement for C-3 was begun prior to 1950, but the new material, C-4, did not begin pilot production until 1956. [3] : 125  C-4 was submitted for patent as "Solid Propellant and a Process for its Preparation" March 31, 1958, by the Phillips Petroleum Company. [4]

Characteristics and uses

Composition

The Composition C-4 used by the United States Armed Forces contains 91% RDX ("Research Department Explosive", an explosive nitroamine), bound by a mixture of 5.3% dioctyl sebacate (DOS) or dioctyl adipate (DOA) as the plasticizer (to increase the plasticity of the explosive), thickened with 2.1% polyisobutylene (PIB, a synthetic rubber) as the binder, and 1.6% of a mineral oil often called "process oil". Instead of "process oil", low-viscosity motor oil is used in the manufacture of C-4 for civilian use. [5]

The British PE4 consists of 88.0% RDX, 1.0% pentaerythrite dioleate and 11.0% DG-29 lithium grease (corresp. to 2.2% lithium stearate and 8.8% mineral oil BP) as the binder; a taggant (2,3-dimethyl-2,3-dinitrobutane, DMDNB) is added at a minimum of 0.10% weight of the plastic explosive, typically at 1.0% mass. The newer PE7 consists of 88.0% RDX, 1.0% DMDNB taggant and 11.0% of a binder composed of low molecular mass hydroxyl-terminated polybutadiene, along with an antioxidant and an agent preventing hardening of the binder upon prolonged storage. The PE8 consists of 86.5% RDX, 1.0% DMDNB taggant and 12.5% of a binder composed of di(2-ethylhexyl) sebacate thickened with high molecular mass polyisobutylene.

Technical data according to the Department of the Army for the Composition C-4 follows. [6]

Theoretical maximum density of the mixture, grams per cubic centimeter 1.75
Nominal density, grams per cubic centimeter 1.72658
Heat of formation, calories per gram −32.9 to −33.33
Max heat of detonation with liquid water, kilocalories per gram 1.59 (6.7 MJ/kg)
Max heat of detonation with gaseous water, kilocalories per gram 1.40 (5.9 MJ/kg)
Remains plastic with no exudation, Celsius −57 to +77
Detonation pressure with density of 1.58 grams per cubic centimeter, kilobars 257

Manufacture

C-4 is manufactured by combining the above ingredients with binders dissolved in a solvent. Once the ingredients have been mixed, the solvent is extracted through drying and filtering. The final material is a solid with a dirty white to light brown color, a putty-like texture similar to modeling clay, and a distinct smell of motor oil. [6] [7] [8] Depending on its intended usage and on the manufacturer, there are differences in the composition of C-4. For example, a 1990 U.S. Army technical manual stipulated that Class IV composition C-4 consists of 89.9±1% RDX, 10±1% polyisobutylene, and 0.2±0.02% dye that is itself made up of 90% lead chromate and 10% lamp black. [6] RDX classes A, B, E, and H are all suitable for use in C-4. Classes are measured by granulation. [9]

The manufacturing process for Composition C-4 specifies that wet RDX and plastic binder are added in a stainless steel mixing kettle. This is called the aqueous slurry-coating process. [10] The kettle is tumbled to obtain a homogeneous mixture. This mixture is wet and must be dried after transfer to drying trays. Drying with forced air for 16 hours at 50 °C to 60 °C is recommended to eliminate excess moisture. [6] : 198 

C-4 produced for use by the U.S. military, commercial C-4 (also produced in the United States), and PE-4 from the United Kingdom each have their own unique properties and are not identical. The analytical techniques of time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy have been demonstrated to discriminate finite differences in different C-4 sources. Chemical, morphological structural differences, and variation in atomic concentrations are detectable and definable. [11]

Detonation

A detonation within a blast-resistant trash receptacle using a large C-4 explosive charge C4 explosion.jpg
A detonation within a blast-resistant trash receptacle using a large C-4 explosive charge

C-4 is very stable and insensitive to most physical shocks. C-4 cannot be detonated by a gunshot or by dropping it onto a hard surface. It does not explode when set on fire or exposed to microwaves. [12] Detonation can be initiated only by a shockwave, such as when a detonator inserted into it is fired. [7] When detonated, C-4 rapidly decomposes to release nitrogen, water and carbon oxides as well as other gases. [7] The detonation proceeds at an explosive velocity of 8,092 m/s (26,550 ft/s). [13]

A major advantage of C-4 is that it can easily be molded into any desired shape to change the direction of the resulting explosion. [7] [14] C-4 has high cutting ability. For example, the complete severing of a 36-centimetre (14 in) deep I-beam takes between 680 and 910 g (1.50 and 2.01 lb) of C-4 when properly applied in thin sheets. [15]

Form

Military grade C-4 is commonly packaged as the M112 demolition block. The demolition charge M112 is a rectangular block of Composition C-4 about 2 by 1.5 inches (51 mm × 38 mm) and 11 inches (280 mm) long, weighing 1.25 lb (570 g). [1] [16] The M112 is wrapped in a sometimes olive color Mylar-film container with a pressure-sensitive adhesive tape on one surface. [17] [18]

The M112 demolition blocks of C-4 are commonly manufactured into the M183 "demolition charge assembly", [16] which consists of 16 M112 block demolition charges and four priming assemblies packaged inside military Carrying Case M85. The M183 is used to breach obstacles or demolish large structures where larger satchel charges are required. Each priming assembly includes a five-or-twenty-foot (1.5 or 6.1 m) length of detonating cord assembled with detonating cord clips and capped at each end with a booster. When the charge is detonated, the explosive is converted into compressed gas. The gas exerts pressure in the form of a shock wave, which demolishes the target by cutting, breaching, or cratering. [1]

Other forms include the mine-clearing line charge and M18A1 Claymore Mine. [10]

Safety

Composition C-4 exists in the U.S. Army Hazardous Components Safety Data Sheet on sheet number 00077. [19] : 323  Impact tests done by the U.S. military indicate composition C-4 is less sensitive than composition C-3 and is fairly insensitive. The insensitivity is attributed to using a large amount of binder in its composition. A series of shots were fired at vials containing C-4 in a test referred to as "the rifle bullet test". Only 20% of the vials burned, and none exploded. While C-4 passed the Army's bullet impact and fragment impact tests at ambient temperature, it failed the shock stimulus, sympathetic detonation and shaped charge jet tests. [10] Additional tests were done including the "pendulum friction test", which measured a five-second explosion temperature of 263 °C to 290 °C. The minimum initiating charge required is 0.2 grams of lead azide or 0.1 grams of tetryl. The results of 100 °C heat test are: 0.13% loss in the first 48 hours, no loss in the second 48 hours, and no explosions in 100 hours. The vacuum stability test at 100 °C yields 0.2 cubic centimeters of gas in 40 hours. Composition C-4 is essentially nonhygroscopic. [6]

The shock sensitivity of C-4 is related to the size of the nitramine particles. The finer they are the better they help to absorb and suppress shock. Using 3-nitrotriazol-5-one (NTO), or 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) (available in two particle sizes (5 μm, 40 μm)), as a substitute for RDX, is also able to improve stability to thermal, shock, and impact/friction stimulus; however, TATB is not cost-effective, and NTO is more difficult to use in the manufacturing process. [10]

Sensitivity test values
reported by the U.S. Army. [19] : 311, 314 
Impact test with 2 kilogram weight / PA APP (% TNT) >100
Impact test with 2 kilogram weight / BM APP (% TNT) —
Pendulum friction test, percent explosions 0
Rifle bullet test, percent explosions 20
Explosion temperature test, Celsius 263 to 290
Minimum detonating charge, gram of lead azide 0.2
Brisance measured by Sand test (% TNT) 116
Brisance measured by plate dent test 115 to 130
Rate of detonation at density1.59
Rate of detonation meters per second8000
Ballistic pendulum test percent 130

Analysis

Toxicity

C-4 has toxic effects on humans when ingested. Within a few hours multiple generalized seizures, vomiting, and changes in mental activity occur. [20] A strong link to central nervous dysfunction is observed. [21] If ingested, patients may be administered a dose of active charcoal to adsorb some of the toxins, and haloperidol intramuscularly and diazepam intravenously to help the patient control seizures until it has passed. However, ingesting small amounts of C-4 is not known to cause any long-term impairment. [22]

Investigation

If C-4 is marked with a taggant, such as DMNB, it can be detected with an explosive vapor detector before it has been detonated. [23] A variety of methods for explosive residue analysis may be used to identify C-4. These include optical microscope examination and scanning electron microscopy for unreacted explosive, chemical spot tests, thin-layer chromatography, X-ray crystallography, and infrared spectroscopy for products of the explosive chemical reaction. Small particles of C-4 may be easily identified by mixing with thymol crystals and a few drops of sulfuric acid. The mixture will become rose colored upon addition of a small quantity of ethyl alcohol. [24]

RDX has a high birefringence, and the other components commonly found in C-4 are generally isotropic; this makes it possible for forensic science teams to detect trace residue on fingertips of individuals who may have recently been in contact with the compound. However, positive results are highly variable and the mass of RDX can range between 1.7 and 130  ng, each analysis must be individually handled using magnifying equipment. The cross polarized light images obtained from microscopic analysis of the fingerprint are analyzed with gray-scale thresholding [25] to improve contrast for the particles. The contrast is then inverted in order to show dark RDX particles against a light background. Relative numbers and positions of RDX particles have been measured from a series of 50 fingerprints left after a single contact impression. [26]

Military and commercial C-4 are blended with different oils. It is possible to distinguish these sources by analyzing this oil by high-temperature gas chromatography–mass spectrometry. The oil and plasticizer must be separated from the C-4 sample, typically by using a non-polar organic solvent such as pentane followed by solid phase extraction of the plasticizer on silica. This method of analysis is limited by manufacturing variation and methods of distribution. [5]

Use

Vietnam War

U.S. soldiers during the Vietnam War era would sometimes use small amounts of C-4 as a fuel for heating rations, as it will burn unless detonated with a primary explosive. [7] However, burning C-4 produces poisonous fumes, and soldiers are warned of the dangers of personal injury when using the plastic explosive. [27]

Among field troops in Vietnam it became common knowledge that ingestion of a small amount of C-4 would produce a "high" similar to that of ethanol. [22] [20] Others would ingest C-4, commonly obtained from a Claymore mine, to induce temporary illness in the hope of being sent on sick leave. [28]

Use in terrorism

Terrorist groups have used C-4 worldwide in acts of terrorism and insurgency, as well as domestic terrorism and state terrorism.

On May 13, 1985, the Philadelphia Police Department dropped a C-4 bomb on the home of the MOVE organization, [29] killing eleven people — including five children — and wiping out 61 homes in two city blocks.

Composition C-4 is recommended in al-Qaeda's traditional curriculum of explosives training. [8] In October 2000, the group used C-4 to attack the USS Cole, killing 17 sailors. [30] In 1996, Saudi Hezbollah terrorists used C-4 to blow up the Khobar Towers, a U.S. military housing complex in Saudi Arabia. [31] Composition C-4 has also been used in improvised explosive devices by Iraqi insurgents. [8]


See also

Related Research Articles

<span class="mw-page-title-main">RDX</span> Explosive chemical compound

RDX (abbreviation of "Research Department eXplosive" or Royal Demolition eXplosive) or hexogen, among other names, is an organic compound with the formula (CH2N2O2)3. It is white, odorless and tasteless, widely used as an explosive. Chemically, it is classified as a nitroamine alongside HMX, which is a more energetic explosive than TNT. It was used widely in World War II and remains common in military applications.

<span class="mw-page-title-main">Explosive</span> Substance that can explode

An explosive is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances.

<span class="mw-page-title-main">Plastic explosive</span> Type of explosive material

Plastic explosive is a soft and hand-moldable solid form of explosive material. Within the field of explosives engineering, plastic explosives are also known as putty explosives or blastics.

<span class="mw-page-title-main">Semtex</span> General purpose plastic explosive

Semtex is a general-purpose plastic explosive containing RDX and PETN. It is used in commercial blasting, demolition, and in certain military applications.

<span class="mw-page-title-main">TNT</span> Impact-resistant high explosive

Trinitrotoluene, more commonly known as TNT (and more specifically 2,4,6-trinitrotoluene), and by its preferred IUPAC name 2-methyl-1,3,5-trinitrobenzene, is a chemical compound with the formula C6H2(NO2)3CH3. TNT is occasionally used as a reagent in chemical synthesis, but it is best known as an explosive material with convenient handling properties. The explosive yield of TNT is considered to be the standard comparative convention of bombs and asteroid impacts. In chemistry, TNT is used to generate charge transfer salts.

<span class="mw-page-title-main">Shaped charge</span> Explosive with focused effect

A shaped charge is an explosive charge shaped to focus the effect of the explosive's energy. Different types of shaped charges are used for various purposes such as cutting and forming metal, initiating nuclear weapons, penetrating armor, or perforating wells in the oil and gas industry.

<span class="mw-page-title-main">Pentaerythritol tetranitrate</span> Explosive chemical compound

Pentaerythritol tetranitrate (PETN), also known as PENT, pentyl, PENTA, TEN, corpent, or penthrite, is an explosive material. It is the nitrate ester of pentaerythritol, and is structurally very similar to nitroglycerin. Penta refers to the five carbon atoms of the neopentane skeleton. PETN is a very powerful explosive material with a relative effectiveness factor of 1.66. When mixed with a plasticizer, PETN forms a plastic explosive. Along with RDX it is the main ingredient of Semtex.

<span class="mw-page-title-main">Tetryl</span> Chemical compound

2,4,6-Trinitrophenylmethylnitramine or tetryl (C7H5N5O8) is an explosive compound used to make detonators and explosive booster charges.

<span class="mw-page-title-main">Detonator</span> Small explosive device used to trigger a larger explosion

A detonator is a device used to make an explosive or explosive device explode. Detonators come in a variety of types, depending on how they are initiated and details of their inner working, which often involve several stages. Types of detonators include non-electric and electric. Non-electric detonators are typically stab or pyrotechnic while electric are typically "hot wire", exploding bridge wire or explosive foil.

Brisance is the shattering capability of a high explosive, determined mainly by its detonation pressure.

Polymer-bonded explosives, also called PBX or plastic-bonded explosives, are explosive materials in which explosive powder is bound together in a matrix using small quantities of a synthetic polymer. PBXs are normally used for explosive materials that are not easily melted into a casting, or are otherwise difficult to form.

An explosive booster is a sensitive explosive charge that acts as a bridge between a conventional detonator and a low-sensitivity explosive such as TNT. By itself, the initiating detonator would not deliver sufficient energy to set off the low-sensitivity charge. However, it detonates the primary charge, which then delivers an explosive shockwave that is sufficient to detonate the secondary, main, high-energy charge.

A triggering sequence, also called an explosive train or a firing train, is a sequence of events that culminates in the detonation of explosives. For safety reasons, most widely used high explosives are difficult to detonate. A primary explosive of higher sensitivity is used to trigger a uniform and predictable detonation of the main body of the explosive. Although the primary explosive itself is generally a more sensitive and expensive compound, it is only used in small quantities and in relatively safely packaged forms. By design there are low explosives and high explosives made such that the low explosives are highly sensitive and high explosives are comparatively insensitive. This not only affords inherent safety to the usage of explosives during handling and transport, but also necessitates an explosive triggering sequence or explosive train. The explosive triggering sequence or the explosive train essentially consists of an 'initiator', an 'intermediary' and the 'high explosive'.

<span class="mw-page-title-main">Composition B</span> Explosive, a mix of RDX and TNT

Composition B, also known as Hexotol and Hexolite, is a high explosive consisting of castable mixtures of RDX and TNT. It is used as the main explosive filling in artillery projectiles, rockets, land mines, hand grenades and various other munitions. It was also used for the explosive lenses in the first implosion-type nuclear weapons developed by the United States.

The Composition C family is a family of related US-specified plastic explosives consisting primarily of RDX. All can be moulded by hand for use in demolition work and packed by hand into shaped charge devices. Variants have different proportions and plasticisers and include composition C-2, composition C-3, and composition C-4.

<span class="mw-page-title-main">Satchel charge</span> Explosive device

A satchel charge is a demolition device, primarily intended for combat, whose primary components are a charge of dynamite or a more potent explosive such as C-4 plastic explosive, a carrying device functionally similar to a satchel or messenger bag, and a triggering mechanism; the term covers both improvised and formally designed devices.

<span class="mw-page-title-main">FOX-7</span> Chemical compound

FOX-7 or 1,1-diamino-2,2-dinitroethylene(DADNE) is an insensitive high explosive compound. It was first synthesized in 1998 by the Swedish National Defence Research Institute (FOS). The name FOX-7 is derived from the acronym of the Swedish Defence Research Agency (FOI), with the I replaced by an X to indicate an explosive, as in RDX and HMX.

<span class="mw-page-title-main">Pyrotechnic fastener</span> A type of quick release fastener

A pyrotechnic fastener is a fastener, usually a nut or bolt, that incorporates a pyrotechnic charge that can be initiated remotely. One or more explosive charges embedded within the bolt are typically activated by an electric current, and the charge breaks the bolt into two or more pieces. The bolt is typically scored around its circumference at the point(s) where the severance should occur. Such bolts are often used in space applications to ensure separation between rocket stages, because they are lighter and much more reliable than mechanical latches.

<span class="mw-page-title-main">Explosively formed penetrator</span> Shaped charge designed to penetrate armor effectively

An explosively formed penetrator (EFP), also known as an explosively formed projectile, a self-forging warhead, or a self-forging fragment, is a special type of shaped charge designed to penetrate armor effectively, from a much greater standoff range than standard shaped charges, which are more limited by standoff distance. As the name suggests, the effect of the explosive charge is to deform a metal plate into a slug or rod shape and accelerate it toward a target. They were first developed as oil well perforators by American oil companies in the 1930s, and were deployed as weapons in World War II.

Explosive materials are produced in numerous physical forms for their use in mining, engineering, or military applications. The different physical forms and fabrication methods are grouped together in several use forms of explosives.

References

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  5. 1 2 Reardon, Michelle R.; Bender, Edward C. (2005). "Differentiation of Composition C4 Based on the Analysis of the Process Oil". Journal of Forensic Sciences. 50 (3). Ammendale, MD: Bureau of Alcohol, Tobacco, Firearms, and Explosives, Forensic Science Laboratory: 1–7. doi:10.1520/JFS2004307. ISSN   0022-1198.
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  9. ↑ Headquarters, U.S. Department of the Army (25 Sep 1990), Department of the Army Technical Manual – Military Explosives (PDF), pp. 8–37–38 (124–125).
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  13. ↑ "C4 product page". Ribbands Explosives. Archived from the original on 2017-05-17. Retrieved 2014-05-21.
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  15. ↑ Dennis, James A. (December 1965). "Steel cutting with high-explosive charges" (PDF). apps.dtic.mil. Fort Belvoir, Virginia: U. S. Army Engineer Research And Development Laboratories. Report 1839. Archived from the original (PDF) on 2019-05-02.
  16. 1 2 Use of Mine, Antitank: HE, Heavy, M15 as a Substitute for Charge Assembly Demolition, M37 Or M183. Headquarters, Department of the Army. 1971.
  17. ↑ "M112" (PDF). American Ordnance. Archived from the original (PDF) on 22 March 2015. Retrieved 19 July 2014.
  18. ↑ "Military Explosives" (PDF). ATF Law Enforcement Guide to Explosives Incident Reporting. Bureau of Alcohol, Tobacco, Firearms, and Explosives. Archived from the original (PDF) on 19 July 2014. Retrieved 15 July 2014.
  19. 1 2 Headquarters, U.S. Department of the Army (25 Sep 1990), Department of the Army Technical Manual – Military Explosives (PDF), pp. A-13 (323).
  20. 1 2 Stone, William J.; Paletta, Theodore L.; Heiman, Elliott M.; Bruce, John I.; Knepshield, James H. (December 1969). "Toxic Effects Following Ingestion of C4 Plastic Explosive". Arch Intern Med. 124 (6): 726–730. doi:10.1001/archinte.1969.00300220078015. PMID   5353482.
  21. ↑ Woody, Robert C.; Kearns, Gregory L.; Brewster, Marge A.; Turley, Charles P.; Sharp, Gregory B.; Lake, Robert S. (1986). "The Neurotoxicity of Cyclotrimethylenetrinitramine (RDX) in a Child: A Clinical and Pharmacokinetic Evaluation". Clinical Toxicology. 24 (4): 305–319. doi:10.3109/15563658608992595. PMID   3746987.
  22. 1 2 K Fichtner, MD (May 2002). "A plastic explosive by mouth". Journal of the Royal Society of Medicine. 95 (5). U.S. Army Hospital, Camp Bondsteel, Kosovo: 251–252. doi:10.1177/014107680209500510. PMC   1279680 . PMID   11983768. C4 contains 90% cyclotrimethylenetrinitramine (RDX)
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  27. ↑ "Chapter 1: Military Explosives" (PDF). FM 3–34.214 (FM 5–250) Explosives and Demolitions. Washington, D.C.: U.S. Department of the Army. 27 August 2008. p. 6. Composition C4 explosive is poisonous and dangerous if chewed or ingested; its detonation or burning produces poisonous fumes.
  28. ↑ Herr, Michael (1977). Dispatches. Knopf. ISBN   978-0-679-73525-0.
  29. ↑ "May 13, 1985: Philadelphia Police Bomb MOVE". Zinn Education Project. Retrieved 2024-05-13.
  30. ↑ Whitaker, Brian (21 August 2003). "Bomb type and tactics point to al-Qaida". The Guardian. London. Retrieved July 11, 2009.
  31. ↑ Ashcroft, John (21 June 2001). "Attorney General, on Khobar Towers Indictment" (Press release).
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