C-4 – הבדלי גרסאות
תוכן שנמחק תוכן שנוסף
מ שוחזר מעריכה של 88.154.251.117 (שיחה) לעריכה האחרונה של FlaBot |
אין תקציר עריכה |
||
שורה 27:
[[sv:C-4]]
[[tr:C-4]]
או מידע באנגלית :
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Preparing C-4 explosiveC-4 or Composition C-4 is a common variety of military plastic explosive. The term composition is used for any stable explosive, and "Composition A" and "Composition B" are other known variants.
C-4 is made up of explosive, plastic binder, plasticizer and, usually, marker or taggant chemicals such as 2,3-dimethyl-2,3-dinitrobutane (DMDNB) to help detect the explosive and identify its source. As with many plastic explosives, the explosive material in C-4 is RDX (also known as cyclonite or cyclotrimethylene trinitramine) which makes up around 91% of the C-4 by weight. The plasticizer is di(2-ethylhexyl) or dioctyl sebacate (5.3%), and the binder is polyisobutylene (2.1%). Another plasticizer used is dioctyl adipate (DOA). A small amount of SAE 10 non-detergent motor oil (1.6%) is also added. C-4 detonates at about 26,400 fps (8,050 meters per second).
C-4 is made by combining RDX slurry with binder dissolved in a solvent. The solvent is then evaporated away and the mixture is dried and filtered. The final material is an off-white solid with a feel similar to modelling clay.
C-4 is a 1960s improvement on a British World War II development called Nobel 808 which contained RDX, mineral oil, and lecithin. C-4 is part of a group of explosives along with C, C2 and C3, each containing different amounts of RDX.
A major advantage of C-4 is that it can easily be moulded into any desired shape. C-4 can be pressed into gaps/voids in buildings, bridges, equipment or machinery. Similarly, it can easily be inserted into empty shaped-charge cases of the type used by special forces. C-4 is also well known for its durability, reliability, and safety. It will not explode even if hit by a bullet, punched, cut, or thrown into a fire. The only reliable method for detonation is via a detonator or blasting cap. However, applying pressure in combination with heat can often cause detonation.
When the military or a demolition company uses C-4 they normally use 8–10 pounds of C-4 to demolish eight-inch-square steel beams, even though this is more explosive than is required. They do this to make sure that they have accomplished the job successfully.
British plastic explosive is referred to as PE4. Like C-4, it is an off-white solid and its explosive characteristics are nearly identical. The only difference between C-4 and PE4 is the type and proportion of plasticizer used.
C-4 is 1.34 times as explosive as Trinitrotoluene(TNT).
| |||