Optical cable with silicon core tube
A silicon core tube is a high-density polyethylene (HDPE) conduit with a low-friction silicone inner layer, designed to protect and facilitate smooth installation of optical cables.
Structure and Materials
Silicon core tubes are typically three-layer co-extruded composite pipes:
- Outer layer (HDPE shell): Provides structural strength, impact resistance, corrosion resistance, UV protection, and weather durability .
- Middle layer: Enhances mechanical strength and overall structural integrity .
- Inner layer (silicon core): A solid silicone or siliceous lubricant layer co-extruded with HDPE, offering an ultra-low friction coefficient for smooth cable installation . The inner silicone layer is made from a mixture of high-density polyethylene, silicone, active silicone oil, dimethyl silicone oil, initiating agents, and antioxidants, ensuring heat resistance, durability, and repeated cable extraction without peeling or detachment .
Performance Characteristics
- Low friction: Friction coefficient can be as low as 0.06–0.142, allowing optical cables to be pulled or blown through the tube with minimal effort .
- Durability: Resistant to wear, heat, and environmental factors; the inner silicone layer does not react with water and can be flushed if needed .
- Mechanical strength: HDPE outer shell provides high pressure resistance, ring rigidity, and flexibility for bends and drops during installation .
- Long service life: Can last up to 100 years under proper conditions .
- Labor-saving installation: The low-friction inner layer reduces labor intensity and allows longer cable blowing distances, improving construction efficiency .
Applications
Silicon core tubes are widely used in:
- Telecommunication networks for fiber optic and electrical cables
- Highways and railways for long-distance cable protection
- Public information networks and cable television systems
- Direct burial or innerduct installations in existing conduits
Specifications
- Sizes: Common diameters include 32/26, 34/28, 40/33, 46/38, 50/41, 63/54 mm, with custom sizes available .
- Wall thickness: Typically 2–6 mm, with standard options of 3.0, 3.5, and 4.0 mm .
- Lengths: Standard lengths range from 1,500 m to 3,000 m per coil, with longer lengths available for special requirements .
- Pressure classes: SDR ratings from SDR41 to SDR6, supporting various installation pressures .
Advantages
- Reduces friction and cable wear during installation
- Supports repeated cable extraction without damage
- Provides excellent heat and environmental resistance
- Simplifies construction and reduces project costs
- Compatible with air-blown cable installation systems for long distances Silicon core tubes represent a modern, high-performance solution for optical cable protection, combining HDPE structural strength with a permanently lubricated silicone inner layer to ensure efficient, safe, and long-lasting cable deployment.
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