Does its name imply it’s armored? Does it actually contain metal? Will it feel stiff?
The “Armored” fiber optic patch cord indeed contains real metal internally, but it doesn’t feel like a solid iron bar that’s impossible to bend. Instead, it possesses considerable flexibility and elasticity.
Here’s an explanation of its internal structure and tactile characteristics from a physical structure and engineering design perspective:
1. Does an Armored Patch Cord Really Contain Metal Inside?
Yes, it contains a high-strength metal protective layer.
Standard fiber optic patch cords typically rely solely on Kevlar® (aramid yarn) and a PVC jacket for tensile protection, offering almost no resistance to side pressure, crushing, cuts from sharp objects, or rodent bites.
To protect the extremely fragile silica optical fiber (silicon dioxide) inside, armored fiber optic patch cords incorporate a metal layer. Taking OFSCN®'s armored patch cords as an example, their internal metal structures primarily include:
- Stainless Steel Seamless Steel Tube: Tightly jacketed around the innermost optical fiber (e.g., an ultra-thin stainless steel tube with an outer diameter of only 0.6\text{ mm} or 0.9\text{ mm}), capable of withstanding extremely high physical side pressure.
- Stainless Steel Wire/Galvanized Steel Wire Stranded Structure: Outside the stainless steel tube, a stranding or braiding process similar to steel wire rope is used to provide exceptional tensile strength (tensile strength typically reaching 1200\text{ N} to 1500\text{ N} or more).
2. Does It Feel Very Stiff?
No, it doesn’t feel very stiff. It presents a metallic soft cable feel with “high toughness and kink resistance.”
- Excellent Flexibility: Due to the extremely thin wall of the internal stainless steel tube (typically around 0.1\text{ mm} to 0.2\text{ mm}) and the use of highly elastic 316L or similar grade stainless steel, it is very easy to bend and coil. The feel is similar to a high-end flexible metal hose or a somewhat stiff metal wire.
- Kink Resistance: If a standard fiber optic patch cord is bent at too sharp an angle (i.e., kinked), the optical fiber will break directly. However, when an armored patch cord is bent to its limit radius, the internal steel tube provides mechanical limitation, acting as a “kink-resister” to protect the fiber from micro-bending loss or breakage.
- Resistance to Crushing and Rodent Bites: Because of the metal layer, the internal optical fiber remains intact even when stepped on or run over by heavy objects during installation, or if chewed by rodents.
3. Typical Armored Patch Cord Product Examples
In practical engineering applications, you can refer to the following typical armored patch cord structures from OFSCN®:
Example 1: Stainless Steel Seamless Tube Armored Patch Cord
Internally composed of a PVC outer jacket, a 0.6\text{ mm} stainless steel seamless steel tube, and optical fiber. With an extremely small outer diameter of 2.0\text{ mm}, it boasts a tensile strength greater than 1500\text{ N} and a compressive strength greater than 150\text{ MPa}.
OFSCN® 2.0mm Micro Steel Armored Fiber Optic Patch Cord Official Link
Example 2: Steel Wire Stranded All-Metal Armored Patch Cord
Internally composed of a 0.6\text{ mm} galvanized steel wire stranded structure, a 1.0\text{ mm} stainless steel seamless steel tube, and optical fiber. This all-metal protection offers a feel similar to a high-strength thin steel wire rope, providing extremely robust adaptability to harsh environments.
OFSCN® 2.0mm Steel Wire Rope Fiber Optic Patch Cord Official Link
