AP Explosives manufactures shock-tube based non-electric delay detonators under the brand name APEXCEL.
APEXCEL consists of co-polymer hollow tube cut to the desired length as per the customer needs. It varies from 2.0 metres length to 50.0 metres length. In its annular space, it has small quantities of reactive material. This tube is known as shock tube or nonel tube which is an important component of this system.
When the shock tube is fired by the detonator or by the detonating cord, order wave with high velocity passes through the tube and initiates the delay detonator. The shock wave travels through the reactive material which is confined to the inner walls of the tube. The tube however remains unaffected.