Product Overview
The Fire resistant multi loose tube non‑metallic Fiber Optic cables are designed for outside plant which is prone to electrical interference. They are mainly installed inside buildings, tunnels, subways or closed areas in general, specially designed to guarantee the signal transmission even in case of fire. The cable can also be used for direct burial for armoured version.
Standards:
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Basic design to Telcordia GR‑20
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RUS 7 CFR 1755.900 (REA PE‑90)
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ICEA S 87‑640
Physical & Thermal Properties:
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Temperature range during operation (fixed state): -20°C to +60°C
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Temperature range during installation (mobile state): 0°C to +50°C
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Minimum installation bending radius: 20 × outer diameter
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Minimum operation bending radius:
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Unarmoured: 10 × outer diameter
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Armoured: 20 × outer diameter
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Specifications
| Property | Details |
|---|---|
| Working Temperature | 70°C |
| Fire Resistance | ✓ (signal transmission during fire) |
| Application | Outdoor, building, tunnel, subway, direct burial (armoured) |
| Construction | Multi‑loose tube, non‑metallic (optional FRP central strength member) |
Construction
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Fibers: Singlemode and multimode fibers, with loose tube technology.
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Structure: 5 to 36 fibers containing tubes or fillers stranded in up to 3 layers around a central strength member and bound under a LSZH sheath. Each tube contains 4‑12 fibers, filled with water blocking gel.
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Central Strength Member: Solid or stranded steel wire coated with polyethylene. For non‑metallic construction, FRP (Fiber Glass Reinforced Plastics) is used.
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Fire Barrier: Jelly‑filled tubes are individually wound with fire blocking mica glass tape and cabled around a central strength member.
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Water Blocking: Swellable tape and thread.
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Reinforcement: Aramid yarn or fiber glass wound around the tube for physical protection, tensile strength, and added fire protection.
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Inner Sheath (optional): PE or thermoplastic LSZH. PE preferred for outdoor water protection.
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Armouring (optional – direct burial): Galvanized steel wire braid, corrugated steel tape armour, or galvanized steel wire armour over inner PE/LSZH sheath.
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Steel tape armour: 0.15mm copolymer‑coated steel tape with overlap.
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Steel wire braid/armour: single layer of galvanized steel wire.
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Moisture Barrier Tape (optional): Aluminium tape under sheath for water blocking and shielding.
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Ripcord (optional): Under jacket for easy removal.
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Outer Sheath: Thermoplastic LSZH compound.
Technical Parameters
Unarmoured Type
| Cable Code | Fiber Count | Tube Diameter (mm) | Nominal Overall Diameter (mm) | Approx. Weight (kg/km) | Tension Load (N) | Crush (N/100mm) |
|---|---|---|---|---|---|---|
| MLA-B-C×D-F-H-J-FR | 72 | 2.5 | 15.0 | 230 | 4000 | 3000 |
| MLA-B-C×D-F-H-J-FR | 96 | 2.5 | 16.5 | 250 | 4000 | 3000 |
| MLA-B-C×D-F-H-J-FR | 144 | 2.5 | 20.5 | 280 | 4000 | 3000 |
Steel Wire Braid Armour
| Cable Code | Fiber Count | Tube Diameter (mm) | Nominal Overall Diameter (mm) | Approx. Weight (kg/km) | Tension Load (N) | Crush (N/100mm) |
|---|---|---|---|---|---|---|
| MLA-B-C×D-F-2Y(SWB)H-J-FR | 72 | 2.5 | 15.0 | 280 | 3000 | 3500 |
| MLA-B-C×D-F-2Y(SWB)H-J-FR | 96 | 2.5 | 17.5 | 310 | 3000 | 3500 |
| MLA-B-C×D-F-2Y(SWB)H-J-FR | 144 | 2.5 | 21.5 | 350 | 3500 | 3500 |
Corrugated Steel Tape Armour
| Cable Code | Fiber Count | Tube Diameter (mm) | Nominal Overall Diameter (mm) | Approx. Weight (kg/km) | Tension Load (N) | Crush (N/100mm) |
|---|---|---|---|---|---|---|
| MLA-B-C×D-F-2Y(STA)H-J-FR | 72 | 2.5 | 16.5 | 290 | 3000 | 7500 |
| MLA-B-C×D-F-2Y(STA)H-J-FR | 96 | 2.5 | 18.5 | 350 | 3000 | 7500 |
| MLA-B-C×D-F-2Y(STA)H-J-FR | 144 | 2.5 | 22.5 | 450 | 3500 | 7500 |
Steel Wire Armour
| Cable Code | Fiber Count | Tube Diameter (mm) | Nominal Overall Diameter (mm) | Approx. Weight (kg/km) | Tension Load (N) | Crush (N/100mm) |
|---|---|---|---|---|---|---|
| MLA-B-C×D-F-2Y(SWA)H-J-FR | 72 | 2.0 | 15.0 | 360 | 3500 | 5000 |
| MLA-B-C×D-F-2Y(SWA)H-J-FR | 96 | 2.0 | 16.5 | 390 | 4000 | 5000 |
| MLA-B-C×D-F-2Y(SWA)H-J-FR | 144 | 2.0 | 18.5 | 430 | 4500 | 5000 |
Mechanical Properties – Summary
| Property | Unarmoured | Armoured |
|---|---|---|
| Maximum Compressive Load | 4000 N | 6000 N |
| Repeated Impact | 4.4 N·m (J) | 4.4 N·m (J) |
| Twist (Torsion) | 180° × 10 times, 125×OD | 180° × 10 times, 125×OD |
| Cyclic Flexing | 100 cycles | 25 cycles |
| Crush Resistance | 220 N/cm (125 lb/in) | 220 N/cm (125 lb/in) |
Test Methods (IEC 60794-1-2)
| Test | Standard |
|---|---|
| Temperature Cycling | F2 |
| Tensile Strength | E1A |
| Crush | E3 |
| Impact | E4 |
| Repeated Bending | E6 |
| Torsion | E7 |
| Kink | E10 |
| Cable Bend | E11 |
| Cold Bend | E11 |