DAYAGEL PERMITTED emulsion explosive is a detonator sensitive, P1 permitted explosive designed for application in underground coal mining. It is white in color and is plastic wrapped with steel wire end clips
Because of the intimate nature of mixing of the ingredients in DAYAGEL PERMITTED the explosive is extremely efficient which results in lower fume levels than for nitroglycerine based or water gel explosives. This makes DAYAGEL PERMITTED well suited to underground blasting situations.
Users should note however that ventilation standards must be maintained and that personnel must not re-enter the mine workings until the required level of ventilation has been reached.
DAYAGEL PERMITTED has very low mechanical impact sensitivity. If exposed to fire, DAYAGEL PERMITTED will self extinguish unless a vigorous external source of heat is applied.
Whilst DAYAGEL PERMITTED does not burn easily it should be kept clear of flame or excessive heat. If DAYAGEL PERMITTED remnants are to be destroyed by burning, advice on the correct method should be sought from DAHANA Engineering Center located at DAHANA offices, or from the local explosives statutory authority.
DAYAGEL PERMITTED explosive can be used in all situations previously encountered with ‘MORCOL’ or ‘AJAX PERMITTED explosives. However due to its greater water resistance DAYAGEL PERMITTED is particularly suitable in wet conditions where the explosive may be exposed to water for many hours before the blast is fired.
RECOMMENDATIONS FOR USE
While the explosives may not normally be subject to prolonged exposure to water tests indicate that in static water conditions it is unaffected after 1 month of immersion
The recommended initiator for DAYAGEL PERMITTED is a No. 8 strength Permitted detonator.
The use of detonating cords is forbidden in underground coal mining applications.
Dynamic Pressure Resistance
Although DAYAGEL PERMITTED has good pressure resistance to desensitization from earlier firing charges, there may be ground conditions such as cleats, clay banding, bedding or ground saturated by water which on occasion causes dynamic desensitization of micro balloon sensitized explosives.
Operators should design blast rounds to avoid situations where the distance between consecutive delays firing is small enough to result in dynamic desensitization of the later firing explosives cartridge.