Semtex

The Semtex is a type of grenade that sticks to the first surface it touches including other players, as seen in the Call of Duty: Modern Warfare 2 multiplayer trailer.

Real-world use
The Semtex was first developed by Czechoslovakia in the 1950s, and was similar to C4 except it could withstand more heat without reacting. It saw widespread use, especially by Libya, North Vietnam and Northern Ireland. Now, because of government restrictions, most of the 10-ton annual production of Semtex is exclusively domestic. Semtex was similar to other plastic explosives, especially C-4, in that it was easily malleable; but it was usable over a greater temperature range than other plastic explosives. There are also visual differences: whereas C-4 is off-white in colour, Semtex is brick-orange.

In-game appearance
The first in-game use of Semtex was seen during the Call of Duty: Modern Warfare 2 multiplayer trailer, working like a regular grenade and having the same principles as the Call of Duty: World at War Sticky Grenade. Its appearance is unusual for a grenade; it is a plastic explosive that has been balled up around a timed detonator with a flashing light.

It appears in multiplayer as well as the Special Ops levels Body Count, Wreckage, and Homeland Security.

Multiplayer
semtex is a sticky granade it kills lots people you only get to use it once and after you die lots of people use its very good

Trivia

 * If you mistakenly pull out your Semtex you can press your "weapon swap" button, and it will return to your inventory without exploding.
 * It is odd, since in real life, Semtex is a replacement for C4, however, if you stick it to a wall right in front of you, there is a "C4" label on it, which can also be seen in the multiplayer menu and the art book which comes with the Hardened Edition
 * It is also odd how the semtex grenade can be used after an EMP is used since it appears to be detonated electronically.
 * Semtex can be used in Spec Ops missions to destroy armoured vehicles like the BTR.
 * Unlike the regular grenade, you cannot cook it, you can hold it indefinitely and not die.
 * The Semtex grenade ingame is strangely an off white color, instead of brick red as real Semtex is. It may actually be C-4 rolled into a ball.
 * If a player sticks the Semtex to an object near him, it will count as suicide.
 * If a player gets stuck by the Semtex on their riot shield or weapon, dropping the shield or weapon for another weapon on the ground unsticks the Semtex from the player.
 * The only part of the Semtex that isn't "sticky" is the black ring that goes around the upper half of the grenade.