Plastic explosive

Some materials are soft and easy to shape.

This stuff is like putty. You can mold it with your hands. It can be made into many shapes.

People use it to break big things. It can cut through metal. It can also break thick walls.

A man named Alfred Nobel made the first kind. He made it in 1875.

Some kinds can even protect tanks. The material sits between two steel plates. This helps shield the tank.

It is used for big jobs. It is more expensive than other tools.

Plastic explosive is a soft solid. It is easy to mold by hand. Some people call it putty explosive.

Engineers use it for demolition. This means using explosions to break things. It can cut through metal. It can also break thick walls.

Alfred Nobel made the first kind in 1875. He made a type called gelignite. Later, people made new types using RDX. RDX is a chemical used in explosives. To make it soft, they add plasticizers. A plasticizer is a substance that makes things flexible.

One famous kind is C-4. It is a white block or sheet. Another kind is Semtex.

This material has many uses. It can protect tanks. It sits between two steel plates. When a round hits the plate, the explosive lets out power. This helps shield the tank. It is also used on steel for trains. The explosion makes the steel very hard. It is more expensive than other tools. This is why it is not used for every job.

Plastic explosive is a soft and moldable solid material. Experts in explosives engineering sometimes call it putty explosive. It is very useful for explosive demolition. This means using explosions to break or cut things. Engineers like it because they can shape it by hand. They can mold it into perfect shapes to cut through metal or thick walls.

This material works in a very specific way. To make it soft, makers add plasticizers to the mix. These are substances that make the explosive flexible. Many modern types use a chemical called RDX. For example, Composition C was made of 88.3% RDX and 11.7% plasticizer. This made it easy to shape. However, it could become brittle when it was cold. Later versions like C2 and C3 changed these amounts to work better in different temperatures.

History shows us how these materials changed over time. Alfred Nobel invented the first plastic explosive called gelignite in 1875. Later, a chemist named Oswald Silberrad created a series called "Nitrols." During World War II, the British used Nobel 808 for many missions. It looked like green plasticine and smelled like almonds. The Special Operations Executive used it for sabotage. In 1944, a failed attempt to kill Adolf Hitler used this same explosive.

There are many different names and types used around the world. In the United States, a common type is Composition C-4. It often comes in white blocks or sheets. Another famous type is called Semtex. Different countries have their own versions, such as PE4 in Australia or Hexomax in France. Some versions are even different colors. For instance, Semtex-1H is orange, while Semtex 10 is black. These many names come from how they are made and where they are used.

You might see these materials working in unexpected places. In some tanks, plastic explosive is sandwiched between two steel plates. This is part of something called reactive armor. When a metal round hits the tank, the explosive detonates. This helps shield the tank by disrupting the energy of the incoming round. Plastic explosives are also used in factories. They can make steel much harder. This is helpful for making parts for trains or tools used to dig the earth.

Plastic explosives are soft, hand-moldable solid materials used in explosives engineering. They are often called putty explosives because of their flexible texture. These materials are highly valued for explosive demolition. This process involves using controlled explosions to destroy structures or obstacles. Because they are moldable, engineers can shape them into specific forms. This allows them to cut through structural members or metal with great precision.

The mechanism behind this flexibility involves adding plasticizers to an explosive base. Plasticizers are substances that decrease sensitivity and make the mixture pliable. Many modern varieties use a chemical called RDX as their primary explosive component. For example, Composition C was composed of 88.3% RDX and 11.7% non-oily, non-explosive plasticizer. The amount of plasticizer determines how the material reacts to the environment. Some mixtures might become brittle in the cold or gummy in high heat. By adjusting these chemical ratios, scientists can create explosives that work in many climates.

Different types of plastic explosives have been developed to solve specific problems. During World War II, the British used Composition C for demolition. This was later replaced by Composition C2, which used 80% RDX and 20% plasticizer. C2 was designed to stay plastic across a wider temperature range. Eventually, Composition C3 was introduced with 77% RDX and 23% plasticizer. However, C3 proved too brittle in cold weather. This led to the development of C4, which belongs to three different classes. C4 uses varying amounts of RDX and polyisobutylene to ensure stability and effectiveness.

The history of these materials began in 1875 with Alfred Nobel. He invented gelignite, which was the first manufactured plastic explosive. Later, before World War I, a chemist named Oswald Silberrad patented "Nitrols." These were composed of nitrated aromatics, collodion, and inorganic salts. During the Second World War, the British company Nobel Chemicals Ltd produced Nobel 808. This explosive looked like green plasticine and had a strong almond smell. It was used extensively by the Special Operations Executive (SOE) for sabotage missions. Even the failed 1944 attempt to assassinate Adolf Hitler involved Nobel 808.

The term "plastique" actually comes from the British introduction of Nobel 808 to the United States. In 1940, the Tizard Mission brought samples to America. These samples had been packaged by the SOE for parachute drops to the French Resistance. Because they were prepared for France, they were labeled in French as "Explosif Plastique." This name is still used in France today and by some Americans. It serves as a linguistic link to the historical use of these materials in European resistance efforts.

Plastic explosives serve several important roles beyond simple demolition. In military technology, they are used in reactive armor for tanks. In this system, the explosive is sandwiched between two steel plates. When an incoming shaped charge round hits the outer plate, it detonates the plastic explosive. This detonation disrupts the energy of the round to shield the tank. Additionally, they are used in commercial industry for shock hardening. This process hardens high manganese steel, which is used for train rails and digging tools.

Global variations of these explosives show how different nations manage their defense needs. In the United Kingdom, the Ministry of Defence uses various versions like PE4, PE7, and PE8. Australia utilizes PE4 or PE4-MC, while France uses Hexomax. Even the colors can vary between different types of Semtex. For instance, Semtex-1H is orange, while Semtex 10 is black. These diverse names and compositions reflect the long history of chemical engineering and the specific requirements of different military and industrial tasks.