Detonating cord

US Marines 100830-M-DX861-005 detonation cord

US Navy 090701-N-5710P-017 Navy explosive ordnance disposal technicians double strand detonation cord before making an overpressure charge during a live demolition demonstration during exercise Infinite Response '09

Detonating cord (also known as det cord, detonating fuse, or primacord) is a flexible tube filled with explosive materials used primarily for initiating explosives. It is designed to transmit a detonation wave at high speed, which can initiate other explosives in a sequence or be used for demolition purposes. Detonating cord is a critical component in mining, construction, and military operations where precise control over the timing and direction of an explosion is required.

History

The development of detonating cord can be traced back to the early 20th century, where the need for a reliable and safe method to initiate explosives was growing, especially in the mining industry. Its invention revolutionized the way explosives were used, allowing for more controlled and effective blasting operations.

Design and Function

A typical detonating cord consists of a core of high explosives, such as PETN (pentaerythritol tetranitrate) or RDX (Cyclotrimethylenetrinitramine), encased in a flexible, waterproof outer layer. This design allows the cord to be easily laid out along the desired path of the explosion. When ignited, the explosive core detonates at a high velocity, typically ranging from 4,000 to 8,000 meters per second, transmitting a detonation wave along the length of the cord.

Applications

Detonating cord is used in a variety of applications, including:

• Demolition: For the controlled demolition of buildings and structures, det cord can be used to cut through metal, concrete, and other materials.
• Mining: In mining operations, it is used to break rock or coal in a controlled manner, improving safety and efficiency.
• Military: The military uses det cord for breaching operations, demolition tasks, and to clear obstacles.
• Special Effects: In the film and entertainment industry, det cord is often used to create controlled explosions for special effects.

Safety and Handling

Handling detonating cord requires strict safety precautions. It must be stored in a dry, secure location and handled only by trained professionals. The risk of accidental detonation can be minimized by following proper handling procedures and using appropriate safety equipment.

Environmental Considerations

The use of detonating cord, like other explosives, can have environmental impacts, including noise pollution, ground vibration, and the potential for toxic residue. Efforts to minimize these impacts are an important consideration in the planning and execution of blasting operations.

Regulation

The manufacture, storage, and use of detonating cord are regulated by various national and international laws and regulations. These regulations are designed to ensure safety and security, preventing unauthorized access and use of explosive materials.

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