Abstract: Non-electric and non-explosive fuse-like initiating device which makes use of a process of propagation of a gaseous plasma generated by deflagration of a pyrotechnic material deposited as a layer on the inner surface of a supporting duct, employing transfer of thermal energy given by an instantaneous source of heat from one end to the other of the duct, for application in the art of blasting with a fuse-like function. The pyrotechnic mixture applied to the supporting duct is subjected to a suitable mixing process to ensure cohesive properties so that the mixture will adhere in the proper manner to the inner surface of the supporting duct and permit great flexibility in the density of the lining charge. Use of a pyrotechnic mixture to line the inner surface of the duct permits the use of a vast range of chemical substances.

Abstract: A device for application in the art of blasting, by the use of nonelectric devices, and the new concept that employs pyrotechnic mixtures and combinations thereof which are distributed in granular form throughout the inside of a supporting tube. The pyrotechnic mixture applied to the supporting tube having been subjected to a suitable mixing process to ensure cohesive properties so that the mixture will adhere in the proper manner to the inside surface of the supporting tube, and will allow for great flexibility in the density of the surface charge, in addition to allowing for the use of a vast range of chemical substances, as well as the secondary use of these devices as retarder units.