External Heatshrink
FAQs
External heatshrink is used to seal, protect, and weatherproof cable joints, terminations, and exposed cable ends during outdoor installation. It provides:
- Moisture protection against rain and groundwater
- UV resistance for long term outdoor durability
- Mechanical protection against abrasion
- Environmental sealing for ducts, cables, and closures
Heat shrinkable sealing caps are especially important for sealing unused cable ends to prevent water ingress during construction or staged network build phases.
Netceed supplies a wide range of telecom grade, weather resistant heatshrink products:
- 3:1 external heatshrink tubing for general purpose sealing over cables, joints, and connectors
- Heat-shrinkable sealing caps seals cable ends to prevent water ingress
- Adhesive-lined heatshrink creates a watertight bond for outdoor and underground use
- Heavy-wall heatshrink for rugged environments or mechanical protection
- Specialist external heatshrink Kits for duct sealing, joint closure reinforcement, or FTTx drop protection
All products are suitable for FTTx, backbone fibre, copper telecoms, and electrical outdoor use.
Choosing the right heatshrink depends on cable diameter, application, and environment:
Shrink Ratio (3:1)
- Suitable for most external telecom and fibre applications, as it fits over connectors and shrinks tightly onto cable jackets.
Heatshrink Diameter
- Select tubing with a pre-shrink ID approx. 20-40% larger than the largest part of the cable or connector.
For sealing caps, choose a cap with:
- A recovered ID smaller than the cable diameter
- A pre-shrink size large enough to slide over the cable end
- Adhesive-lined tubing is best for wet, underground, or long term outdoor installations
To ensure a watertight, long-lasting seal:
1. Clean the cable jacket to remove dirt or grease.
2. Slide the heatshrink or cap over the cable before connecting or positioning.
3. Use a hot air gun or approved heating tool - avoid naked flames.
4. Heat from the centre outward to ensure even shrinking.
5. Look for adhesive bleed-out (if applicable) to confirm a complete seal.
6. Allow the heatshrink to cool fully before handling.
Following these steps ensures a secure, professional grade weather seal for fibre and telecom networks.