Overview
Detonating cord is a critical component in controlled demolition and mining operations. It consists of a high-explosive core (commonly PETN or RDX) wrapped in a protective sheath. Unlike safety fuse, it detonates along its entire length nearly instantaneously, making it ideal for synchronizing multiple explosive charges. The cord typically comes in diameters ranging from 3-10 mm, with larger diameters containing more explosive material for stronger initiation capability. Modern variants feature waterproof and abrasion-resistant coatings for use in harsh environments. Its reliability and precise timing characteristics have made it indispensable in industrial blasting applications.
Physical and Chemical Properties
The cord's physical properties are dominated by its sheath material (usually polyethylene or textile) which provides flexibility and environmental protection. The core explosive typically has a density of 1.2-1.6 g/cm³, with detonation velocities between 6,000-8,000 m/s - significantly faster than sound propagation in air. Chemically, the explosive core is stable under normal conditions but sensitive to strong impacts or friction. The sheath materials are chosen for chemical inertness, resisting degradation from moisture, fuels, or mild acids commonly encountered at worksites. Unlike black powder fuses, detonating cord contains no flammable components - it functions through detonation rather than combustion.
Main Applications
In mining operations, detonating cord is used to create precise initiation sequences for rock fragmentation. Its ability to transmit detonation reliably through water makes it particularly valuable in wet boreholes. The construction industry employs it for controlled building demolitions, where multiple charges must detonate within milliseconds of each other. Military applications include demolition of fortifications and clearing landmines. Specialized versions with low electromagnetic signatures are used in sensitive operations. Some quarrying operations use colored cords to distinguish between different blast patterns or delay sequences in complex shot designs.
Safety and Storage
As a Category 1.1D explosive material, detonating cord requires strict storage protocols. It should be kept in original packaging within approved explosive magazines, separated from detonators and other initiating devices. Storage areas must maintain temperature below 40°C and relative humidity below 75% to prevent degradation. Transportation requires compliance with UN 0065 regulations. Workers handling the cord must avoid creating sharp bends or kinks that might damage the explosive core. Cutting should only be done with tools designed for explosive materials, never with regular knives or shears that could cause friction ignition.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ATF or equivalent national explosive manufacturing licenses. Key specifications to verify include detonation velocity (minimum 6,000 m/s for most applications), waterproof rating, and temperature operating range (-40°C to +60°C for Arctic operations). Bulk purchases typically offer 10-15% cost savings, with standard reel lengths of 100m or 500m. Consider ordering different colored sheaths for complex blasting patterns. Lead times can be 4-8 weeks for specialized variants, so plan procurement accordingly. Always verify current transportation regulations before placing orders across jurisdictional boundaries.
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