Safety fuse consists of a black powder core covered by plastic yarns and an extruded jacket.

Safety fuse is similar in appearance to detonating cord but has a black core where detonating cord has a white PETN core.

Safety fuse burns at between 90 and 120 seconds per meter and is usually crimed into a plain detonator.

There are a number of significant hazards associated with the use of safety fuse. See attached Safety Bulletin from the WA Regulator