Omar Khalid
C-4, or Composition C-4, is a plastic explosive that is commonly used by military units worldwide and in select civilian settings. It is composed of explosives, a plastic binder, a 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 moulded into any desired shape. It is relatively stable and insensitive to most physical shocks, and can only be detonated by a shockwave, such as from a detonator or blasting cap. C-4 is a powerful explosive that has been used in terrorist attacks and during the Vietnam War as part of demolition blocks.
| Characteristics | Values |
|---|---|
| Texture | Similar to modelling clay |
| Composition | Explosives, plastic binder, plasticizer, and a marker or odorizing taggant chemical |
| Colour | Dirty white to light brown |
| Smell | Motor oil |
| Detonation | Only by the shock wave from a detonator or blasting cap |
| Velocity of detonation | 8,092 m/s (26,550 ft/s) |
| Ingredients | RDX, dioctyl sebacate (DOS) or dioctyl adipate (DOA), polyisobutylene, and mineral oil |
| Toxicity | Ingestion can lead to CNS effects, renal and gastrointestinal symptoms, seizures, nausea, vomiting, muscle twitching, and mentation changes |
| Uses | Military, civilian, and terrorist applications |
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What You'll Learn
Composition C-4's ingredients and manufacturing process
C-4, or Composition C-4, is a type of plastic explosive that uses RDX ("Research Department Explosive", an explosive nitroamine) as its primary explosive agent. It is composed of explosives, a plastic binder, a plasticizer to make it malleable, and usually a marker or odorizing taggant chemical. The proportions of these ingredients can vary depending on the manufacturer and intended usage. For example, a 1990 U.S. Army technical manual specified that Class IV composition C-4 consists of 89.9% RDX, 10% polyisobutylene, and 0.2% dye, while the C-4 used by the United States Armed Forces contains 91% RDX, 5.3% dioctyl sebacate (DOS) or dioctyl adipate (DOA) as the plasticizer, 2.1% polyisobutylene (PIB) as the binder, and 1.6% mineral oil ("process oil").
The manufacturing process for Composition C-4 involves combining the ingredients with binders dissolved in a solvent. The ingredients can be mixed in any order, but it is preferable to add the energetic solids first. Mixing can be performed by hand or using a conventional mixer, such as a Hobart Planetary Mixer or a Sigma-Blade Mixer. Room temperature and pressure are suitable for mixing. Once the ingredients are mixed, the solvent is extracted through drying and filtering, resulting in a solid material with a dirty white to light brown colour, a putty-like texture, and a distinct smell of motor oil.
C-4 is known for its stability and insensitivity to most physical shocks. It cannot be detonated by a gunshot or by dropping it onto a hard surface, and it will not explode when set on fire or exposed to microwaves. Instead, detonation can only be initiated by a shockwave, such as the firing of a detonator inserted into the explosive. When detonated, C-4 rapidly decomposes to release nitrogen, water, carbon oxides, and other gases at an explosive velocity of 8,092 m/s (26,550 ft/s).
One drawback of Composition C-4 is its relatively low deformability at room temperature, which can make it challenging to force into small holes or inject through narrow passageways in field operations or manufacturing environments. As a result, C-4 must be either heated to a high temperature to increase its extrudability or cut into smaller dimensions to permit its insertion into tight spaces. However, heating C-4 can be hazardous and impractical in field operations due to the unpredictable nature of such environments.
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C-4's explosive properties and velocity
C-4, or Composition C-4, is a plastic explosive that uses RDX ("royal demolition explosive" or "research development explosive") as its explosive agent. It is composed of explosives, a plastic binder, a 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 moulded into any desired shape, making it ideal for explosive demolition.
C-4 is very stable and insensitive to most physical shocks. It 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. Detonation can only be initiated by a shockwave, such as when a detonator inserted into it is fired.
When detonated, C-4 undergoes a rapid chemical reaction, decomposing to release nitrogen, water, carbon oxides, and other gases. The reactants (the original chemical compounds) have a lot of energy stored up as chemical bonds between different atoms. When the compound molecules break apart, the resulting gases may use some of this energy to form new bonds, but not all of it. Most of the leftover energy takes the form of extreme heat. The concentrated gases are under very high pressure, so they expand rapidly, with the heat speeding up the individual gas particles and boosting the pressure even higher.
The gas pressure generated by C-4 is strong enough to destroy structures and injure or kill people. If the gas expands faster than the speed of sound, it generates a powerful shock wave. The pressure can also push pieces of solid material outward at great speed, causing them to hit people or structures with a lot of force. The detonation proceeds at an explosive velocity of 8,092 m/s (26,550 ft/s).
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C-4's use in military and civilian settings
C-4 is a plastic explosive that is used in military units and select civilian settings. It is a member of the Composition C family of chemical explosives, which was first developed by the British during World War II. C-4 is composed of explosives, a plastic binder, a plasticizer to make it malleable, and usually a marker or odorizing taggant chemical. It has a texture similar to modelling clay and can be moulded into any desired shape.
In military settings, C-4 is used for demolition purposes, such as breaching obstacles or demolishing large structures. It is also used in mine-clearing line charges and Claymore mines. The United States Armed Forces use a form of C-4 that contains 91% RDX ("Research Department Explosive"), bound by a mixture of dioctyl sebacate (DOS) or dioctyl adipate (DOA) as the plasticizer, thickened with polyisobutylene (PIB) as the binder, and mineral oil. C-4 produced for the U.S. military has unique properties and is not identical to commercial C-4 produced in the United States or PE-4 from the United Kingdom. Military C-4 is very stable and insensitive to most physical shocks. It cannot be detonated by a gunshot or by dropping it onto a hard surface, and it does not explode when set on fire or exposed to microwaves.
In civilian settings, C-4 is manufactured with low-viscosity motor oil instead of "process oil". There is limited information available on the specific uses of C-4 in civilian settings, but it is primarily used in explosive demolition, such as the demolition of buildings or other structures.
C-4 has also been used for non-demolition purposes in both military and civilian settings. For example, during the Vietnam War, U.S. soldiers sometimes used small amounts of C-4 as fuel for heating rations, although it produces poisonous fumes. There have also been reports of military personnel combining C-4 with ethanol, leading to toxicity.
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C-4 ingestion and toxicity
Composed of RDX, plastic binder, petroleum oil, and a marker chemical, C-4 (or Composition C-4) is a common type of plastic explosive. It is moldable and can be shaped by hand, allowing for easy use in demolition and sabotage. C-4 has a distinctive smell often described as "oily" or "greasy," and it is usually pressed into blocks or rolls for storage and transport.
While C-4 is primarily designed to be detonated, there are risks associated with ingestion and exposure. Ingesting C-4 can occur accidentally or intentionally, and the effects can be harmful or even fatal. The toxicity of C-4 is mainly attributed to its RDX content, which has been the subject of extensive toxicological studies. Here is an overview of the potential effects and hazards of C-4 ingestion:
RDX, or cyclic 1,3,5-trimethyl-2,4,6-nitroamine, is the primary explosive component in C-4 and is responsible for its toxic effects. When C-4 is ingested, the RDX is absorbed into the bloodstream through the gastrointestinal tract. The rate and extent of absorption can vary depending on factors such as the amount ingested, the duration of exposure, and individual factors like age, weight, and gastrointestinal motility. Once absorbed, RDX distributes throughout the body, including to vital organs such as the liver, kidneys, and brain.
The toxic effects of C-4 ingestion can be acute or chronic, depending on the amount and frequency of exposure. Acute effects may include gastrointestinal irritation, nausea, vomiting, and diarrhea. In more severe cases, ingestion can lead to central nervous system depression, characterized by symptoms such as dizziness, headache, confusion, and in extreme cases, seizures or loss of consciousness. Respiratory depression and cardiovascular effects, such as hypotension and irregular heartbeat, may also occur. Chronic exposure to C-4, through repeated ingestion or occupational exposure, has been associated with various health issues, including neurological problems, liver and kidney damage, and reproductive toxicity.
The toxicity of C-4 is largely dependent on the amount ingested and the individual's overall health status. Ingesting small amounts of C-4, especially accidentally, may not cause any significant toxic effects, especially if immediate medical attention is sought. However, intentional ingestion of larger amounts or chronic exposure can have severe consequences. In such cases, medical intervention is crucial, and supportive care, including respiratory support, fluid management, and monitoring of vital organ functions, may be necessary.
While the marker chemicals added to C-4 for identification can help detect its presence, they do not directly contribute to its toxicity. These chemicals, which may include DMDNB (3,4-dinitro-2,6-dimethylbenzoic acid) or EGDN (ethyleneglycol dinitrate), are added in small quantities and are not expected to cause significant toxic effects on their own. However, they can be detected through specialized analytical techniques, aiding in the identification of C-4 exposure.
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C-4's history and development
C-4 is a member of the Composition C family of chemical explosives. It was developed in the 1960s as an improvement on a pre-existing explosive called Nobel 808. The original RDX-based material was first developed by the British during World War II and then 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, and the concentration of RDX was increased, improving its 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. C-4 was submitted for patent as "Solid Propellant and a Process for its Preparation" on March 31, 1958, by the Phillips Petroleum Company. C-4 is manufactured by combining explosive 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, and a distinct smell of motor oil.
C-4 is very stable and difficult to detonate accidentally. It cannot be detonated by a gunshot or by dropping it onto a hard surface. Fire will cause C-4 to burn with very high heat, even underwater, and it was often used by U.S. troops in Vietnam to cook food. C-4 is 1.34 times more explosive than TNT, and a small amount can cause a lot of damage. Due to its stability and destructive power, C-4 has attracted the attention of terrorists and guerrilla fighters worldwide. It has been used in numerous terrorist attacks and suicide bombings, including the attack on the U.S.S. Cole in 2000 and the bombing of the Khobar Towers U.S. military housing complex in Saudi Arabia in 1996.
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Frequently asked questions
C-4, or Composition C-4, is a type of plastic explosive. It is composed of explosives, plastic binder, plasticizer, and a marker or odorizing taggant chemical.
C-4 is designed to be detonated by a shockwave, such as the firing of a detonator inserted into it. When detonated, C-4 decomposes rapidly to release nitrogen, water, carbon oxides, and other gases. The detonation proceeds at an explosive velocity of 8,092 m/s (26,550 ft/s).
C-4 has a dirty white to light brown colour, a putty-like texture similar to modelling clay, and a distinct smell of motor oil.
C-4 is used in military and civilian settings for demolition and flares. It has also been used in terrorist attacks around the world.
