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Razor wire&#;long-barb type on top of a chain link privacy-fence surrounding a utility power sub-stationBarbed tape or razor wire is a mesh of metal strips with sharp edges whose purpose is to prevent trespassing by humans. The term "razor wire", through long usage, has generally been used to describe barbed tape products. Razor wire is much sharper than the standard barbed wire; it is named after its appearance but is not razor sharp. The points are very sharp and made to rip and snag clothing and flesh.
The multiple blades of a razor-wire fence are designed to inflict serious cuts on anyone attempting to climb through or over it and therefore also has a strong psychological deterrent effect. Razor wire is used in many security applications because, although it can be circumvented relatively quickly by humans with tools, penetrating a razor-wire barrier without tools is very slow and typically injurious, often thwarting such attempts or giving security forces more time to respond.
Use
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Short barb razor wire at Tuol Sleng MuseumThe first use of barbed wire for warfare was in during the Spanish American War, thirty-one years after the first patents were issued in . One of the most notable examples during the Spanish American War is the defense provided by the Moron-Jucardo Trocha. The trocha (or trench) stretched for fifty miles between the cities of Moron and Jucardo. Within this trench, and in addition to fallen trees, barbed wire was used. The barbed wire was arranged in a cat&#;s cradle formation that for every 12 yards of barbed fence built, 420 yards of barbed wire was strung (or 35 yards of wire per yard of fence).[1]
Later versions of this type of barbed wire were manufactured by Germany during the First World War. The reason for this was a wartime shortage of wire to make conventional barbed wire. Therefore, flat wire with triangular cutting edges began to be punched out of steel strips ("band barbed wire"). A welcome side effect was that a comparable length of barbed wire of this new type could be produced in less time. These precursors to NATO wire did not yet have an inner wire for stabilization, were therefore easy to cut with tin snips, and were also not as robust as normal barbed wire. However, they withstood the wire cutters used at the time to cut normal barbed wire, as was common at the front.[2][3][4][5]
An article in a issue of The Hardware Trade Journal tells the story under the headline: "This Cruel War&#;s Abuse of Our Old Friend &#;Bob Wire.'" After telling a little about Glidden and his invention, the article goes on as follows: "Quite naturally some animals enclosed by Glidden&#;s fencing gashed themselves on the barbs. Just as naturally, men and boys tried to climb over or under those fences and had their clothes and flesh torn...These wounds upon man and beast and the suddenness with which Glidden&#;s barbs halted all living things came to the attention of military men, and the barbed wire entanglement of which we now read almost every day in the war news was born...And it may be said right here that soldiers who have been halted by wire entanglements while making a charge say the devil never invented anything nastier."[6][7]
Starting in the late s, barbed tape was typically found in prisons and secure mental hospitals, where the increased breaching time for a poorly equipped potential escapee was a definite advantage. Until the development of reinforced barbed tape in the early s (and especially after the September 11 attacks), it was rarely used for military purposes or genuine high security facilities because, with the correct tools, it was easier to breach than ordinary barbed wire. Since then, some military forces have replaced barbed wire with barbed tape for many applications, mainly because it is slightly lighter for the same effective coverage, and it takes up very little space compared to barbed wire or reinforced barbed tape when stored on drums.
More recently,[when?] barbed tape has been used in more commercial and residential security applications. This is often primarily a visual deterrent since a well-prepared burglar can breach barbed wire and barbed tape barriers in similar amounts of time, using simple techniques such as cutting the wire or throwing a piece of carpet over its strands.
Due to its dangerous nature, razor wire/barbed tape and similar fencing/barrier materials are prohibited in some locales. Norway prohibits any barbed wire except in combination with other fencing, in order to protect domesticated animals from exposure.[8]
Construction
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Barbed tape on a fenceRazor wire has a central strand of high tensile strength wire, and a steel tape punched into a shape with barbs. The steel tape is then cold-crimped tightly to the wire everywhere except for the barbs. Flat barbed tape is very similar, but has no central reinforcement wire. The process of combining the two is called roll forming.
Types
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Like barbed wire, razor wire is available as either straight wire, spiral (helical) coils, concertina (clipped) coils, flat wrapped panels or welded mesh panels. Unlike barbed wire, which usually is available only as plain steel or galvanized, barbed tape razor wire is also manufactured in stainless steel to reduce corrosion from rusting. The core wire can be galvanized and the tape stainless, although fully stainless barbed tape is used for permanent installations in harsh climatic environments or under water.
Barbed tape is also characterized by the shape of the barbs. Although there are no formal definitions, typically short barb barbed tape has barbs from 10&#;12 millimetres (0.4&#;0.5 in), medium barb tape has barbs 20&#;22 millimetres (0.8&#;0.9 in), and long barb tape has barbs 60&#;66 millimetres (2.4&#;2.6 in).
According to the structure
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According to the coil type
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Common specifications of razor wire
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Contact us to discuss your requirements of Greenhouse Benches Metal. Our experienced sales team can help you identify the options that best suit your needs.
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Specification Wire dia.Short barb razor wire with central reinforcement
Medium barb razor wire
Long barb razor wire on a fence. At the bottom there is some barbed wire
See also
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References
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When most people think of security fencing, chances are they imagine them with razor coils. Razor coils are certainly an effective barrier (although, like any type of fencing, they're not completely infallible.) But since razor coils are so rare in Canada, many people don't know too much about them aside from that. So we've put togehter some interesting facts about razor coils so you can take a "crash course."
Razor coils can be very dangerous to people and animals. Which is why you can't just install them wherever you like in Canada. You will need to get special permission to install razor coils in Canada, and it's quite difficult to get. Razor coils are mostly used on correctional facilities and military sites, with government permission, and in very remote locations. Even then, they are positioned very high up, or on the inside of other kinds of fencing, so there's very little chance anyone would accidentally come into contact with them. Don't try to install razor coils until you have permission! You might get a fine.
Razor coils are used all over the world, and although we mostly use what is called "BTC" in Canada, there are other kinds. Razor coil types include:
BTC or Barbed Tape Concertina, which is the round razor coils we seem most often in Canada. They're made of interconnected spirals of razor wire, which gives them the "concertina" shape they're named for.
Flatwrap which is a two dimensional razor coil. The razor wire is wound to create a spiral and then clipped where the wires intersect, but unlike BTC, this is not a three dimensional coil. Which allows it to be tied directly onto fence mesh.
Electrocoils are a type of BTC coils that have electric fence insulators and wire inside the actual coil. Thes can be connected to a fence energiser, so you not only have razor coils, but an electric current inside the coil. These are used on high security prisons in some parts of the world, where there are zoned electric fences that are monitored from a central command station or guardhouse.
Razor mesh is not exactly a coil, but it's made of the same material. Razor mesh is supplied in large sheets of diamond mesh made from razor wire.
Most of these types of razor mesh are not available and not commonly used in Canada, but it's worth knowing that they exist.
You might think that razor coils are only available in galvanized steel, and that's the most common material in Canada. But razor coils are also made in materials like stainless steel, in grades 304 and 316, and sometimes, a stainless steel barb strip is wrapped around a galvanized wire core.
In most cases, you will see Canadian razor wire specifications calling for "galv/galv" which means a galvanized razor strip wound around a galvanized core wire.
Razor coils come in different sizes, and because of their shape, that is usually measured based on the diameter of the coil. The most common sizes for razor coils are 450mm or 18", 700mm or 28", and 980mm or 39". The diameter of the coil is also based on the amount it is stretched. So of course, if the coil is stretched more or less, the diameter will change.
Another thing you probably don't know about razor coils is that there are different types of razor styles. The razor ribbon that wraps around the wire itself is available in short, medium and long barb, which refers to the length of the barb and the sharpness of the point.
Many kinds of fencing can be installed as a DIY project - but never razor coils! Razor coils should only ever be installed by highly trained fence professionals, using the right tools and PPE.
The last thing we're sharing about razor coils today is that they are also very hazardous to dispose of. Whether you have leftover coils on your site or you're taking down and replacing old coils, they need to be disposed of with the utmost care. Razor coils can be very dangerous and even deadly to people and animals, and they should never be disposed of in an ordinary landfill. Make sure that the coils are taken off site carefully, cut into pieces and disposed of at a metal recycling facility that is capable of disposing of them properly.
Rite-Way Fencing occassionally installs razor coils on high security fencing for various clients. If you have a project where you would like to install razor coils, and you want to know more, please contact your closest branch. We're always happy to help with information and budget pricing for your high security fence project.