Uses:this detonator(fire cracker)adapts for the blasting works in coal mine, the site of the open air, etc, in which allows to contain fire damp or coal dust. Main parameters: Initiating power Tube material Core material Core diameter(mm) Legwire lengh(m) No6;No8 Copper clad steel steel 0.52 3(or on requirement of users) Performances: Resistance: 4.8 6.0Ω. Safety current: when apply 0.18A constant current to the detonator. It is not allowed to fire during 5mins. The ignition current of a single detonator: 0.2A. Period and delay time Period 1 2 3 4 5 Delay time(ms) 0 25 50 75 100 Note: take care in handing, prohibit to be impacted and fractionated, away from fire and heat source, moisture preventing. The resistance should be tested in a protector before using and the testing current is less than 0.03A. Storage: to be stored in a ventilating and dry storehouse under the original package condition.Shelf-life: 2 years. Packing: outside: wooden box Inside: carton List of packing Name of product Numbers External dimensions of wooden box(mm) Gross weight(kg) Pieces/carton Pieces/box Permitted Ms delay electric detonator 100 1000 605*320*315 25