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Razor Wire

 Barbed tape or razor wire is a mesh of metal strips with sharp edges whose purpose is to prevent passage 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 and therefore have a strong psychological deterrent effect. Razor wire is used in many high-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 difficult, giving security forces more time to respond.

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Razor 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

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-mm to 12-mm long, medium barb tape has barbs 20-mm to 22-mm long, and long barb tape has barbs from 60 to 66-mm long.

According to the structure

  • Helical type: Helical type razor wire is the most simple pattern. There are no concertina attachments and each spiral loop is left. It shows a natural spiral freely.
  • Concertina type: It is the most widely used type in the security defense applications. The adjacent loops of helical coils are attached by clips at specified points on the circumference. It shows an accordion-like configuration condition.
  • Blade type: The razor wire are produced in straight lines and cut into a certain length to be welded onto the galvanized or powder coated frame. It can be used individually as a security barrier.
    • Flat type: A popular razor wire type with flat and smooth configuration (like Olympic rings). According to different technology, it can be clipped or the welded type.
    • Welded type: The razor wire tape are welded into panels, then the panels are connected by clips or tie wires to form a continuous razor wire fence.
  • Flattened type: A transformation of single coil concertina razor wire. The concertina wire is flattened to form the flat-type razor wire.

According to the coil type

  • Single coil: Commonly seen and widely used type, which is available in both helical and concertina types.
  • Double coil: A complex razor wire type to supply higher security grade. A smaller diameter coil is placed inside of the larger diameter coil. It is also available in both helical and concertina types.

Common specifications of razor wire

Specification Wire dia.
(mm)
Barb (mm)
Thickness Length Width Spacing
BTO-10 2.5±0.1 0.50±0.05 10±1 13±1 26±1
BTO-12 2.5±0.1 0.50±0.05 12±1 15±1 26±1
BTO-18 2.5±0.1 0.50±0.05 18±1 15±1 33±1
BTO-22 2.5±0.1 0.50±0.05 22±1 15±1 34±1
BTO-28 2.5 0.50±0.05 28 15 45±1
BTO-30 2.5 0.50±0.05 30 18 45±1
CBT-60 2.5±0.1 0.60±0.05 60±2 32±1 100±2
CBT-65 2.5±0.1 0.60±0.05 65±2 21±1 100±2
 

 



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