classification:
electric detonator can be classified into ordinary electric detonator, coal mine permissible electric detonator and earthquake and prospecting electric detonator.
specifications:
1. electricity performance
|
item |
standard |
|||
| ordinary electric detonator and coal mine permissible electric detonator |
earthquake and prospecting electric detonator |
|||
| type = 1 \* roman i |
type = 2 \* roman ii |
type = 3 \* roman iii |
||
| maximum misfiring current/a |
≥0.20 |
≥0.30 |
≥0.80 |
≥0.20 |
| minimum firing current/a |
≤0.45 |
≤1.00 |
≤2.50 |
≤0.45 |
| firing energy/（a•ms） |
≥2.0 |
≤18.0 |
80.0-140.0 |
0.8-5.0 |
| detonating current in series/a |
≤1.2 |
≤1.5 |
≤3.5 |
≤3.5 |
| electrostatic sensitivity /kv |
≥8 |
≥10 |
≥12 |
≥25 |
| 注：1 the overstriking items are mandatory requirements; 2 electrostatic sensitivity is measured by the electrostatic voltage between the leg wire and the detonator tube. |
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2. impedance
in the case that the impedance of the electric detonator is 3ω or less, the tolerance is supposed to be ±25%; in the case that the impedance of the electric detonator is more than 3ω, the tolerance is supposed to be ±15%.
3. blasting damage
a no.5 electric detonator is supposed to be able to explode and penetrate a 4mm lead plate while a no.8 electric detonator is supposed to be able to explode and penetrate a 5mm lead plate. the diameter of the hole caused by the explosion is supposed to be at least 7mm.
4. shock resistance
no detonation, structure damage, short circuit, broken circuit or instability of impedance are supposed to occur after the shock test and the impedance is supposed to accord with the requirements in clause 2.2
5. stretching resistance
no visual damage is supposed to occur in the seal and leg wire of the electric detonator after a minimum 19.6n pulling force lasting 1min. the detonator is supposed to fully detonate in the detonating test afterwards.
6. water resistance
the detonating cord is supposed to be fully detonated after a 4 hour soak in 0.05mpa water.
storage：
the electric detonator is supposed to be kept in well ventilated, dry and fireproofed storehouse. the quality assurance period of the ordinary electric detonator is 18months.