Coal Mine Permissible Electric Detonators
(Including instantaneous electric detonator for coal mine and millisecond delay electric detonator for coal mine)

1. Executive standard: GB8031 Industrial Electric Detonator and MT62-1997 Test Method and Judgment Rules of Safety of Permissible Electric Detonator for Coal Mining in Firedamp.

2. Basic characteristics: Having the level of domestic product of the same kind, using copper-plated steel casings and rigid ignition elements. Having good firing consistency and detonating capacity. High precision delay time, and reliable storage, transportation and application.

3. Application: Suitable for blasting operations in mines with methane and (or) coal dust explosion hazards and general blasting engineering.

4. Specification and performance：
  1) Length of iron leg wire:
       2m, a product of other specification also available based on user needs; shell length: 62 ~ 70mm.
  2) Section and delay time：
       For delay time of millisecond delay electric detonator for coal mine, see the table below:

Section.	1	2	3	4	5
Nominal delay time (ms)	0	25	50	75	100
Leg wire color	Gray red	Gray yellow	Gray blue	Gray white	Green red

5. Packaging:
     10 rounds/bundle, 100 rounds/box, 10 boxes/case, 1000 rounds/case.

6. Warranty period:
    a year and a half from the date of manufacture (in a standard warehouse).