An initiating element of non-primary explosive type comprising a confinement containing secondary explosive, having a first end adapted for ignition of the secondary explosive by igniting means, optionally via delay and flame-conducting pyrotechnic compositions, a second end adapted for delivering a detonation impuls and a intermediate portion in which the secondary explosive upon ignition is able to undergo a deflagration to detonation transition. At least a part of the secondary explosive is m...

A method of manufacturing a compound plate by explosion-welding, the compound plate being intended for package-rolling. The plating material is smaller in area than the base material so that an edge is formed around the periphery of the base material, this free edge surface being protected by the attachment of metal strips, after which an explosive charge, the area of which is at least as great as that of the base material, is placed on top of the plating material and detonated.

A pyrotechnic delay charge for providing delays in the millisecond and second ranges, comprising the components bismuth oxide as an oxidation agent and silicon as a fuel. The invention also relates to a pyrotechnic delay element having an enclosure containing the pyrotechnical delay charge, and to a detonator having a housing, ignition means disposed at one end of the housing, a base charge of a secondary explosive disposed at the other end of the housing and the pyrotechnic delay charge dispose...

A low energy fuse, comprising a plastic tube with a channel, the channel containing a reactive material able upon ignition to sustain a shock wave within the channel, the tube comprising at least two layers of plastic materials, a first plastic layer closer to the channel and a second plastic layer outside the first layer, at least the second layer containing a major amount of draw orientable polymer resin. The polymer in the second layer is axially oriented to an orientation degree (as defined)...

A method and a device for charging boreholes (11) with explosives. One end of the charging hose (3) is introduced to a substantially predetermined distance from the bottom of the borehole. Subsequently, a pumpable explosive is pumped through the charging hose at a controlled rate and substantially simultaneously with the pumping of the explosive the charging hose is withdrawn from the borehole at a controlled rate. The explosive is caused to flow out from a nozzle (13), arranged on said end of t...

A blasting composition of reduced volume strength relative to straight ammonium nitrate/fuel oil (ANFO) compositions, containing particulate oxidizer salt, particulate inert and/or density reducing filler and optionally a fuel for modifying the oxygen balance. The composition contains a viscous water-in-oil type emulsion, having a continuous fuel phase and a discontinuous aqueous phase of oxidizing salts, in an amount sufficient for improving adherence between the particulate oxidizer salt and t...

A block for enclosing, holding or connecting in a signalling pyrotecnical network exploding pyrotecnic ignition devices, such as cords or detonators. The block comprises, in sequence from a centrally arranged ignition device (9), an inner wall (2) substantially surrounding at least an axial part of the ignition device, an empty space (7), or a material of lower density than in the inner wall, substantially surrounding the inner wall, an outer wall (1) substantially surrounding the inner wall and...

Apparatus for explosively welding two metal layers together by providing one layer with a carrier of open-celled foamed plastic material and depositing explosive salt in crysta state on the walls of the cells of such foamed material.

The present invention concerns an electric blasting cap having increased safety against unintentional initiation, said blasting cap presenting a bridge wire and in contact with said bridge wire a fuse head composition which latter is surrounded by a protective tubing of dielectric material.

This apparatus comprises a flexible hose adapted to receive solid and liquid constituents of the explosive. This hose is surrounded by a flexible tube which in turn is surrounded by a rigid tube that is made of a series of sections secured together. Compressed air is supplied into the spaces between the flexible tube and successive sections of the rigid tube successively to force the mixture of the solid and liquid constituents of the explosive down through the hose peristalically. The solid ing...