NONEL LP has been developed for drift and tunnel blasting where there is a need for longer delay times to give the rock time enough to allow for breakage of the rock and for it to be thrown out from the front. Most of the tunnels are nowadays blasted with a parallel hole cut with one or more large holes. The blasted rock from the holes close to the large hole/s must be given time to break and move out of the large hole/s before next hole detonates. The rock mass moves towards the front with a velocity of 40 to 60 m/sec. With a hole depth of 4 m it takes between 60 and 100 ms before the broken rock has left the large hole/s. A delay time of 100 ms between the period numbers is thus necessary to avoid freezing of the cut area with the consequent bad blasting result.