What is DETONATORS?

Detonators are use to detonate or initiate high explosive by producing detonation wave.

Detonators have tube like structure, made up of copper or aluminium. Inside it, it was filled up by chemicals like -

1. Prime charge

2. Base charge

3. Neoprene plug

4. Delay elements

In detonators, chemical reaction is initiated by flame or electric current according to type of detonator.

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* Types of DETONATORS -

There are 3 types of detonators -

1. Plane detonators

2. Electric detonators

3. Delay detonators

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1. Plane detonators -

• It's Initiated by flame or safety fuse.

• It's parts -

1. Safety fuse (point of initiation by flame or safety fuse)

2. Neoprene plug (use for sealing of detonators)

3. Prime charge (have constituents like lead azide lead styphinate aluminum powder - ASA)

4. Base charge (made up of PETN - penta erythritol tetra nitrate)

Plane detonator

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2. Electric detonators -

• It's Initiated by electric current.

• Generally it requires 0.5 ampere Current and 3.5 volt to initiate a detonator.

• It's parts -

1. Lead wire (point of initiation by electric current)

2. Flashing agent (it integrates current spark intensity),(made by LMNR - lead mono nitro resorcinate)

3. Prime charge (have constituents like lead azide lead styphinate aluminum powder -ASA)

4. Base charge (made up of PETN - penta erythritol tetra nitrate)

Electric detonators

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3. Delay detonators -

• They are of two types -

1. Milli second (use for short delay)

2. Half second (use for long delay)

• These delay element containing sleeves are made by copper or brass.

• It's parts -

1. Short delay (red lead and silicon)

2. Long delay (antimony and potassium permagnet)

3. Lead wire (point of initiation by electric current)

4. Flashing agent (it integrates current spark intensity),(made by LMNR - lead mono nitro resourcinol)

5. Prime charge (have constituents like lead azide lead styphinate aluminum powder - ASA)

6. Base charge (made up of PETN - penta erythritol tetra nitrate)

Delay detonators

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# Advantages of delay detonators -

1. Better fragmentation due to availability of dynamic free face.

2. Lesser explosion consumption.

3. Lesser ground vibration.

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# Disadvantages of delay detonators -

1. They get also initiated by -

• Static current

• Radio frequency

• Over head power line

• Lightning

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Blogger - Prashant Kumar Prajapati