Detonating Cord
Detonating cord is a part of perforation set up. It is connected to detonator on one end and to the shaped charges of the perforation gun on the other. It is a means of transferring detonation from detonator to the shaped charges. Cord consists of high explosive core covered with plastic or lead jacket. It can have either round or rectangular cross section. Detonating cords are defined by grains per foot (gpf) which is a unit of explosive load per unit length. One pound contains 7,000 grains. Round detonators usually have 70 to 80 gpf.