Detonating fuse manufacture

From about 1930 onwards a new type of detonating fuse appeared on the market. This consisted of a core of PETN with textile and plastic coatings. Compared with Cordeau, this detonating fuse has several advantages in being more flexible, more easily jointed, lighter in weight and cheaper to manufacture. Under such names as Cordtex and Primacord it has completely replaced Cordeau in normal use. 

The first type to be introduced consisted of PETN or RDX in a metal sheath drawn down to a small diameter. More recently, cord made by the wet process, covered with plastic instead of metal, has been introduced in North America and is available in charges down to 0-6 g m. The methods of manufacture of these cords are believed to be similar to that of Cordeau and the wet detonating fuse process described above. 

Transfer fuses which have no priming effect are manufactured in the USA. Those containing only a fraction of one gram of PETN per meter and a lead sheathing are known as mild detonating fuses . Cords containing about 2g of the explosive per meter inside a plastic-impregnated network are manufactured as Primadet . 

The velocity of detonation of a fuse is about 6500 m s-1. This is attained in the dry process by adequate consolidation of the core during manufacture. During the wet process the necessary density is attained automatically by the method of preparing the core. Fuse usually contains about 10 g PETN per metre length. 

Detonating Cord core of pentaerythritol tetra-nitrate (PETN) contained within a waterproof covering of textile or plastic available in several grades, each on spools of 500 or 1,000 feet. Manufactured by the Ensign-Bickford Company, Coast Fuse, Inc and Austin Powder Company SAFETY FUSE... 

Manufacturing of explosives, detonators, and fuses-related industries... 

Explosives are categorized as either primary or secondary, depending on their sensitivity to shock. Primary explosives, such as lead azide, Pb(N3)2, are the most sensitive. They are used in detonators, blasting caps, and military fuses to initiate the explosion of a less sensitive, secondary explosive. Secondary explosives, or high explosives, are less sensitive to heat and shock than primary explosives and are therefore safer to manufacture and transport. Most secondary explosives simply burn rather than explode when ignited in air, and most can be detonated only by the nearby explosion of a primary initiator. 

Manufactured locally In VC mine factories, this mine contains an Iron-pipe detonator encased In concrete. Another conmand-detonatlng mine. It Is fused electrically and weighs 13 pounds. 

Produced locally in VC mine factories this mine is a prototype of nuiserous other VC-manufactured explosive devices Constructed of sheet metal, with welded seams it generally weighs about 15 pounds, of which 13 pounds are explosive Command detonated, it is fused electrically and employs two detonators, one in each end of the mine The same principle of construction Is applied to salvaged artillery shell casings, expended LAAW launchers, and mont other devices using metal containers ... 

Explosives derived from Benzene—Toluene and Nitro-Benzene-Di- and Tri-nitro-Benzene-Roburite Properties and Manufacture-Bellite Properties, c.-Securite—Tonite No. 3.-Nitro-Toluene-Nitro-Naphthalene—Ammonite-Sprengel s Explosives-Picric Acid- Picrates-Picric Powders—Melinite-Abel s Mixture—Bmgere s Powders- The Fulminates-Composition, Formula, Preparation, Danger of, c.- Detonators Sizes, Composition, Manufacture—Fuses, c. 

Composition, Formula, Preparation, Danger of, c.—Detonators Sizes, Composition, Manufacture—Fuses, c. 

IME recommends a waiting period of 30 minutes for misfires involving fuse detonators, and 15 minutes for electric and nonelectric detonator misfires. Where the product manufacturer or government regulation prescribes a longer waiting period, the longer period should be observed. 

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