AP Permitted Delay Detonators (APPDD)


Description

APPDD are available in 0-6 numbers with delay interval of 25milliseconds. The shells are made of copper material. The delay element is inserted above the primary charge and consolidated. The delay timing is achieved by the lead element on the primary charge. The two lead wires are passed through the PVC plug soldered with the fuse head and crimped.

 

Application

Permitted delay detonators are used in gassy underground coal mines.

 

Product Specification

Class

6

Division

3

Delay No.

Nominal Time (ms)

0

Instantaneous

1

25

2

50

3

75

4

100

5

125

6

150

Shell Material

Copper

Shell Length

(0-6) 43- 68 mm

Base Charge

PETN

Primary Charge

ASA with OAP

Strength

No.8

Lead wire colour

White/blue

Lead wire material

Tinned steel wire.

Bare wire diameter

0.46+/- 0.02 mm

Lead wire resistance

0.5-0.6 ohms/m

Standard length

1.8, 2.0, 2.2, 2.5 or as required

Fuse head resistance

1.6-2.4 ohms

Firing impulse

3.2mws/ohm

Firing current

1.2 amps DC, 0.8 amps DC single

No fire current

0.18 apms for 300 sec

Packing material

Fibre Board

Quantity per box

1000-1500 nos.