Explosive Types

Introduction

Explosive detection dogs are specially trained service dogs capable of detecting and locating various types of explosives. For dog handlers and operational teams, it is essential to know the different explosive types, their chemical properties, and detection characteristics. This knowledge enables precise assessment of dangerous situations and optimizes cooperation between humans and dogs.

The classification of explosives is based on various criteria: chemical composition, detonation velocity, intended use, and hazard level. Each explosive type has characteristic odor molecules that detection dogs can identify.

Classification of Explosives

Explosives are fundamentally divided into three main categories: primary explosives, secondary explosives, and tertiary explosives. This classification is based on their sensitivity to mechanical or thermal stimuli and their function in the ignition system.

Primary Explosives

Primary explosives are highly sensitive explosives that can detonate from minimal mechanical stress or heat. They serve as initiators for less sensitive explosives and are used in detonators, percussion caps, or blasting caps.

Characteristic Properties:

• Very high sensitivity to friction, impact, or heat
• Low detonation velocity (2000-5000 m/s)
• Small quantities sufficient for ignition
• Often metal-containing compounds

Common Examples:

• Lead azide
• Mercury fulminate
• Silver azide
• Tetrazole derivatives

Secondary Explosives

Secondary explosives are less sensitive than primary explosives but require an initial ignition to detonate. They form the main component of explosive charges and are used for military, industrial, and criminal purposes.

Characteristic Properties:

• Moderate sensitivity
• High detonation velocity (6000-9000 m/s)
• Stable storage possible
• Diverse application areas

Tertiary Explosives

Tertiary explosives are the least sensitive explosives and are often used as boosters or main charges. They require strong initial ignition and are relatively safe to handle.

Chemical Explosive Groups

Common Explosive Types in Operations

TNT (Trinitrotoluene)

TNT is one of the best-known military explosives and is frequently used as a reference substance for explosive power. It is relatively stable and safe to handle, making it a preferred explosive for military applications.

Properties:

• Yellow, crystalline substance
• Melting point: 80°C
• Very stable at room temperature
• Characteristic almond-like odor

Application Areas:

• Military explosive charges
• Grenades and bombs
• Explosive mixtures

Detection by Detection Dogs:

TNT has a characteristic odor that trained explosive detection dogs can detect even in minimal concentrations (nanogram range). The odor molecules are volatile and can be perceived even through packaging.

PETN (Pentaerythritol Tetranitrate)

PETN is a very powerful explosive with high detonation velocity. It is frequently used in detonating cords, initiators, and as a booster.

Properties:

• White, crystalline substance
• Very powerful
• Sensitive to friction
• Often mixed with other substances

Application Areas:

• Detonating cords
• Initiators
• Booster charges
• Medical applications (heart medications)

Detection by Detection Dogs:

PETN has a less pronounced odor than TNT but is still detectable by well-trained detection dogs. Training on PETN requires special training methods.

RDX (Hexogen)

RDX is a military high-performance explosive frequently used in plastic explosives such as C4 or Semtex.

Properties:

• White, crystalline substance
• Very high detonation velocity
• Often mixed with plastic binders
• Very stable

Application Areas:

• Plastic explosives (C4, Semtex)
• Military explosive charges
• Explosive mixtures

Detection by Detection Dogs:

RDX itself has a weak odor, but the plastic explosives containing it have characteristic odor patterns that detection dogs can identify.

Dynamite

Dynamite is a classic industrial explosive containing nitroglycerin. Although its use has declined, it is still used in mining and demolition work.

Properties:

• Gelatinous consistency
• Contains nitroglycerin
• Sensitive to temperature fluctuations
• Characteristic odor

Application Areas:

• Mining
• Demolition work
• Historical explosive devices

Detection by Detection Dogs:

Dynamite has a very characteristic, sweetish odor from nitroglycerin that detection dogs can easily recognize.

ANFO (Ammonium Nitrate-Fuel Oil)

ANFO is a relatively safe but very effective explosive frequently used in mining and terrorist attacks.

Properties:

• Mixture of ammonium nitrate and diesel oil
• Relatively safe to handle
• Low cost
• Large quantities possible

Application Areas:

• Mining
• Demolition work
• Terrorist attacks
• Homemade explosive devices

Detection by Detection Dogs:

ANFO has a characteristic odor of ammonia and diesel that detection dogs can identify. Detection can be complicated by packaging (often in bags).

TATP (Triacetone Triperoxide)

TATP is a homemade explosive frequently used by terrorists because the starting materials are readily available.

Properties:

• White, crystalline substance
• Very sensitive
• Unstable
• Characteristic acetone-like odor

Application Areas:

• Homemade explosive devices
• Terrorist attacks
• Illegal activities

Detection by Detection Dogs:

TATP has a very characteristic, pungent acetone-like odor that detection dogs can detect even in low concentrations. This odor is also perceptible to humans.

HMTD (Hexamethylene Triperoxide Diamine)

HMTD is another homemade explosive, similar to TATP, made from readily available chemicals.

Properties:

• White to yellowish substance
• Very sensitive
• Unstable
• Formaldehyde-like odor

Application Areas:

• Homemade explosive devices
• Illegal activities

Detection by Detection Dogs:

HMTD has a characteristic odor that can be detected by detection dogs, although it is less pronounced than TATP.

Plastic Explosives

Plastic explosives are mixtures of powerful explosives and plastic binders. They are moldable, relatively safe to handle, and very effective.

Properties of Plastic Explosives:

• Moldable and kneadable
• Water-repellent
• Relatively stable
• High explosive power
• Characteristic odors from binders

Detection by Detection Dogs:

Plastic explosives have characteristic odor patterns that come from both the explosive components and the binders. Well-trained detection dogs can reliably identify these patterns.

Pyrotechnic Explosives

Pyrotechnic explosives are used in fireworks, signaling devices, and entertainment pyrotechnics. They have lower detonation velocities than powerful explosives but can still be dangerous.

Common Examples:

• Black powder (saltpeter, sulfur, charcoal)
• Flash powder (aluminum, potassium perchlorate)
• Barium and strontium compounds (for colors)

Detection by Detection Dogs:

Pyrotechnic explosives have characteristic odors that can be detected by detection dogs, especially when present in larger quantities.

Detection Characteristics for Detection Dogs

The training of explosive detection dogs focuses on various odor molecules released by explosives. Each explosive type has a characteristic odor pattern that the dog must learn to identify.

Odor Molecules

Nitrates:

• Characteristic saltpeter-like odor
• Often mixed with other odors
• Very volatile

Peroxides:

• Pungent, chemical odor
• Often acetone or formaldehyde-like
• Very characteristic

Azides:

• Weak, metallic odor
• Often difficult to detect
• Requires special training

Factors for Detectability

Volatility:

The volatility of odor molecules determines how easily they can be detected by detection dogs. Highly volatile compounds are easier to detect than low-volatility ones.

Concentration:

The concentration of odor molecules in the air affects detectability. Even in very low concentrations (parts per trillion), detection dogs can detect explosives.

Environmental Conditions:

Temperature, humidity, and wind influence the distribution of odor molecules and thus detectability.

Packaging:

The type of packaging can affect odor release. Permeable materials allow better odor release than dense, airtight packaging.

Checklist: Explosive Types for Dog Handlers

• Knowledge of main categories (primary, secondary, tertiary explosives)
• Understanding of chemical groups (nitrates, peroxides, chlorates, etc.)
• Recognition of most common explosive types (TNT, PETN, RDX, etc.)
• Knowledge of plastic explosives (C4, Semtex, etc.)
• Understanding of odor molecules and detectability
• Knowledge of application areas of different explosive types
• Understanding of hazard level and handling
• Knowledge of packaging types and their influence on odor release
• Understanding of environmental factors on detectability
• Regular continuing education on new explosive types

Hazard Assessment

Operational Scenarios

Knowledge of the various explosive types is essential for assessing dangerous situations. Depending on the detected explosive type, different safety measures may be required.

Homemade Explosive Devices:

• Often TATP or HMTD
• Very sensitive
• Immediate evacuation required

Military Explosives:

• TNT, RDX, PETN
• Relatively stable
• Professional defusing possible

Industrial Explosives:

• Dynamite, ANFO
• Various sensitivities
• Standard defusing procedures