Detonating cord, also called Cordeau and Primacord, is a hollow cord filled with an explosive material. It is fired by a detonator and is capable of initiating the detonation of certain other explosives at any number of points and in any desired pattern. Read More
What is a detonating cord?
(Error Code: 242632) Detonating cord (also called detonation cord, detacord, det. cord, detcord, primer cord or sun cord) is a thin, flexible plastic tube filled with PETN ( pentaerythritol tetranitrate ). With the PETN exploding at a rate of approximately 4 miles per second, any common length of det cord appears to explode instantaneously.
How do you detonate a power cord?
Also routing of the cord so it is not cut Detonating cord is an explosive- usually PETN- in the shape of a cord or small rope. It is exploded by the shock of a blasting cap that is attached to the cord. An electric blasting cap can be detonated by the use of a blasting machine- which you are calling a plunger box.
What can you do with high yield detonating cord?
Higher-yield detonating cord can be used to cut down small trees, although the process is very uneconomical compared to using bulk explosive, or even a chainsaw. High-yield detonating cord placed by divers has been used to remove old dock pilings and other underwater obstructions.
How does an electric detonator work?
Electrical detonators. The initial shock wave is created by vaporizing a length of a thin wire by an electric discharge. A new development is a slapper detonator, which uses thin plates accelerated by an electrically exploded wire or foil to deliver the initial shock. It is in use in some modern weapon systems.
What triggers a detonator?
Heat, flames, sparks or impact may ignite these. Primary or detonating high explosives: These are used primarily in electrical blasting caps or percussion detonators. For safety reasons primary high explosives should be stored separately from other types of explosives.
What is primer cord used for?
PRIMACORD detonating cords are flexible linear explosives with a core of PETN explosive encased in a textile outer jacket. PRIMACORD detonating cords are designed for use as trunklines and/or downlines in various mining, quarrying and construction applications.
How fast does det cord detonate?
21,000 feet per secondNONELECTRIC INITIATION WITH DETONATING CORD Velocity of detonation is generally given as 21,000 feet per second. It is important to remember that all standard precautions apply when blasting with detonating cord; this includes both lightning and the handling of misfires.
What is inside detonating cord?
cord, detcord, primer cord or sun cord) is a thin, flexible plastic tube usually filled with pentaerythritol tetranitrate (PETN, pentrite). With the PETN exploding at a rate of approximately 6,400 m/s (21,000 ft/s), any common length of detonation cord appears to explode instantaneously.
What is meant by detonating?
intransitive verb. : to explode with sudden violence. transitive verb. 1 : to cause to detonate detonate a bomb — compare deflagrate. 2 : to set off in a burst of activity : spark programs that detonated controversies.
Does det cord explode?
BLASTING WITH DETONATING CORD Unlike black powder, detonating cord contains a core of a very high-velocity explosive that detonates (rather than burns) at a speed of about four miles per second. The core is usually PETN, a high explosive with a velocity of about 22,000 feet per second.
Can you shoot det cord?
Avoid loops, sharp kinks, or angles that direct the detonating cord back toward the oncoming line of detonation. Never attempt to cut detonating cord with a blow from a sharp or blunt object. Never saw detonating cord; it may explode and kill or injure.
Can you buy detonation cord?
Dyno Nobel manufactures the world's most well known brands of detonating cord (det cord), available in a wide variety of coreloads (from 7.5 to 400 gr/ft) and either a textile jacket (Primacord®) or a plastic jacket (Primaline®), for a wide variety of mining explosive needs.
How does a non electric detonator work?
Non-electric detonators It consists of a small diameter, three-layer plastic tube coated on the innermost wall with a reactive explosive compound, which, when ignited, propagates a low energy signal, similar to a dust explosion.
What is in Semtex?
One of the well-known ternary PBXs, still from the period of Vietnam War, is Semtex 1H from the assortment of the Czech company Explosia. It is a high performance plastic explosive containing a mixture of RDX and PETN bonded by plasticized SBR rubber [25].
How many volts does it take to set off a blasting cap?
Electric blasting caps are commonly fired from capacitor discharge type blasting machines. These power sources utilize an energy storage capacitor that is charged to a high voltage such as 450 VDC.
How explosive is PETN?
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.
Why does primer stick better than paint?
Primer is a base coat used to help treat a surface before applying a topcoat. Accordingly, primer is formulated to ensure maximum adhesion. Better paint adhesion means your paint job lasts longer. Likewise, primer acts as a sealer for porous surfaces that would otherwise absorb the first few coats of paint.
How many types of primer are there?
threeTypes of Primers. There are three basic types of primers: oil-based, latex and pigmented shellac primer. Each has its strengths and weaknesses and works best on certain surfaces and in particular circumstances.
When were remote detonators invented?
Non-electric detonators were invented by the Swedish company Nitro Nobel in the 1960s and 1970s, under the leadership of Per-Anders Persson, and launched to the demolitions market in 1973.
Effects
As a transmission medium, it can act as a downline between the initiator (usually a trigger) and the blast area, and as a trunkline connecting several different explosive charges.
Rating
Detonating cord is rated in explosive mass per unit length. This is expressed in grains per foot in the United States, or in grams per metre elsewhere. A "grams per metre" rating will be roughly one fifth the "grains per foot" rating. For example, "50 grain det.
Direct employment
Low-yield detonating cord can be used as a precision cutting charge to remove cables, pipes, wiring, fiber optics, and other utility bundles by placing one or more complete wraps around the target. Detcord/Primacord is used in commercial boilers to break up clinkers (solidified coal ash slag) adhering to tube structures.
Colloquialisms
The Finnish army colloquialism for detonation cord is anopin pyykkinaru (mother-in-law's clothesline), as it resembles ordinary clothesline.
What is a detonating cord?
Detonating cord. Detonating cord (detonating fuse) resembles safety fuse but contains a high explosive instead of black powder. The first successful one, patented in France in 1908, consisted of a lead tube, about the same diameter as safety fuse, filled with a core of TNT. It was made by filling a large tube with molten TNT ...
How is a detonating cord used in blasting?
Any number of holes can be connected with it in just about any desired pattern. Attached to the blasting charge and knotted to a trunk line, it is fired by means of either a fuse-type or electric blasting cap. Sequential shooting may be obtained by cutting the trunk lines and inserting delay connectors, which have delay periods ranging from about 5 to 25 milliseconds.
What is the velocity of Primacord?
The velocity is approximately 6,400 metres (21,000 feet) per second. Many types of Primacord are available for both military and commercial use, but the industrial varieties generally contain from 25 to 60 grains of PETN per 0.3 metre. RDX is sometimes used in place of PETN for high temperatures, because the melting points are, respectively, 203.5° and 140° C (398.3° and 284° F).
What is the most powerful nonatomic explosive?
Probably the most powerful of all nonatomic military explosives are the cast mixtures containing aluminum. The torpedo warhead Torpex, for example, is a cast mixture of RDX, TNT, and aluminum.
What is a shaped charge?
A shaped charge normally consists of a cone made of metal or glass surrounded by a high-strength, high-density explosive and means to obtain the proper standoff, or distance to the target.
What is explosive D?
Ammonium picrate (Explosive D) has exceptional value as a charge for armour-piercing projectiles. Loaded in a shell with a suitably insensitive primer, it can be fired through 30 centimetres (12 inches) of armour plate and made to detonate on the far side. These armour-piercing shells were used in both World Wars.
What is the most useful explosive?
It is an excellent military explosive in itself, but its most valuable property is that it can be safely melted and cast either alone or as a slurry with other explosives. This is because there is a wide spread between its melting point and its decomposition temperature.
What is a mild detonating cord?
Mild Detonating Cord is a metal clad linear explosive usually drawn or extruded in a round configuration. It can be rolled into an elliptical or flat ribbon shape based on customer requirements.
What material is used to detonate a MDC?
For added mechanical strength and environmental protection, the smaller diameter MDC sizes can be encased with polyethylene or nylon plastics.
What is a detonating cord?
Dyno Nobel manufactures the world's most well known brands of detonating cord (det cord), available in a wide variety of coreloads (from 7.5 to 400 gr/ft) and either a textile jacket (Primacord®) or a plastic jacket (Primaline®), for a wide variety of mining explosive needs. PRIMACORD det cords are flexible linear explosives with a core ...
What is a primacord cord?
PRIMACORD det cords are flexible linear explosives with a core of PETN explosive encased in a textile outer jacket. PRIMACORD detonating cords are designed for use as trunklines and/or downlines in various mining, quarrying and construction applications.
How to initiate a det cord?
Det cord can be initiated by either an electric cap or a fused cap.
What is a military fuse starter?
the military type safety fuse starters , which are a firing pin device.
Does electron flow generate heat?
Yes but the electron flow generates the heat to begin with.
Can you detonate a det cord with a shotgun shell?
It is possible to detonate det cord with shotgun shells' primers. Of course
How does a detonating cord work?
Detonating cord is an explosive- usually PETN- in the shape of a cord or small rope. It is exploded by the shock of a blasting cap that is attached to the cord. An electric blasting cap can be detonated by the use of a blasting machine- which you are calling a plunger box. When the handle is pushed down quickly, it spins a generator and charges a capacitor. At the bottom of the stroke a switch closes, and all of the store electricity is released into the wires attached to the blasting machine.
What is a detonating cord?
Detonating cord is a hollow, thin walled plastic tube filled with an explosive material -usually Pentaerythritol tetranitrate (PETN) and covered with fabric or a heavier layer of plastic. It is commonly sold in 1,000 ft. rolls, and is most often used to detonate other explosive charges.
How to set off a military det cord?
Military Det cord can be set off with Military special rated Electric or None electric blasting caps taped to the cord at least 6 inches from a cut end. Water migration into cut cord ends can be a problem. Usually done in pairs if None electric with separate fuses if electric wired in series. Modern Shock tube sets have replaced some uses of Det cord and enhanced the safety of Det cord usage with a powerful initiation shock with less likelihood of a misfire. There are many setup tricks to ensuring the cord detonates when the caps or shock tube go off. Also routing of the cord so it is not cut
Why did the detonator detonate in WW1?
the very act of the plunger being depressed built up an electrical charge, through interactions between magnets and coils of copper wire like a generator, that then caused the detonation when the plunger reached bottom and touched the contacts. (kind of like the worst static shock you could think of.)
How much force is needed to activate a det cord?
For most det cord, 600 psi of percussive force is required to initiate it. That is normally done with a blasting cap. A blasting cap is like a bullet shell/casing, except instead of using a firing pin, it’s set off with an electric charge. The blasting cap is normally taped to the cord, often in a U-shaped loop to insure that it won’t misfire.
What is a det cord?
Det cord is normally run between larger charges, to detonate all of them together. This is helpful when an array of charges is used for seismic energy, demolition or in quarry operations.
What is a blaster box?
A modern blaster is a simple device about the size of a kid’s lunch box, which has an instrument to check the blasting cap circuit, to shunt the circuit, until it’s ready to fire, a remote radio for synchronized shooting between locations, a key switch, blast button, safety switch and a battery.
What is a detonator in explosives?
Inserting detonators into blocks of C-4 explosive. A detonator, frequently a blasting cap, is a device used to trigger an explosive device. Detonators can be chemically, mechanically, or electrically initiated, the last two being the most common. The commercial use of explosives uses electrical detonators or the capped fuse which is a length ...
What is an ordinary detonator?
Ordinary detonators usually take the form of ignition-based explosives. While they are mainly used in commercial operations, ordinary detonators are still used in military operations. This form of detonator is most commonly initiated using a safety fuse, and used in non time-critical detonations e.g. conventional munitions disposal. Well known detonators are lead azide [Pb (N 3) 2 ], silver azide [AgN 3] and mercury fulminate [Hg (ONC) 2 ].
What is a non-electric detonator?
A non-electric detonator is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in the blasting of rock in mines and quarries. Instead of electric wires, a hollow plastic tube delivers the firing impulse to the detonator, making it immune to most of the hazards associated with stray electric current. It consists of a small diameter, three-layer plastic tube coated on the innermost wall with a reactive explosive compound, which, when ignited, propagates a low energy signal, similar to a dust explosion. The reaction travels at approximately 6,500 ft/s (2,000 m/s) along the length of the tubing with minimal disturbance outside of the tube. Non-electric detonators were invented by the Swedish company Nitro Nobel in the 1960s and 1970s, and launched to the demolitions market in 1973.
Why does an EBW detonator explode?
Instead of heating up the explosive, the EBW detonator wire is heated so quickly by the high firing current that the wire actually vaporizes and explodes due to electric resistance heating. That electrically driven explosion then fires the detonator's initiator explosive (usually PETN ).
What is the primary explosive used in commercial explosives?
The commercial use of explosives uses electrical detonators or the capped fuse which is a length of safety fuse to which an ordinary detonator has been joined. Many detonators' primary explosive is a material called ASA compound.
Why do we need blasting caps?
The need for detonators such as blasting caps came from the development of safer explosives. Different explosives require different amounts of energy (their activation energy) to detonate. Most commercial explosives are formulated with a high activation energy, to make them stable and safe to handle so they will not explode if accidentally dropped, mishandled, or exposed to fire. These are called secondary explosives. However they are correspondingly difficult to detonate intentionally, and require a small initiating explosion. This is provided by a detonator.
What are the different types of detonators?
There are three categories of electrical detonators: instantaneous electrical detonators ( IED ), short period delay detonators ( SPD) and long period delay detonators ( LPD ). SPDs are measured in milliseconds and LPDs are measured in seconds. In situations where nanosecond accuracy is required, specifically in the implosion charges in nuclear weapons, exploding-bridgewire detonators are employed. The initial shock wave is created by vaporizing a length of a thin wire by an electric discharge. A new development is a slapper detonator, which uses thin plates accelerated by an electrically exploded wire or foil to deliver the initial shock. It is in use in some modern weapons systems. A variant of this concept is used in mining operations, when the foil is exploded by a laser pulse delivered to the foil by optical fiber .
