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Specifications for fiber optic cable heat shrink tubing

Fiber optic cables typically use heat shrink tubing with an inner diameter of 1.3 mm, outer diameter of 2.6 mm, and a length of 60 mm for standard fusion splice protection.Typical Sizes and Specifications

For single fiber optic splices, heat shrink splice protectors are commonly used. Standard dimensions include:

  • Inner diameter: 1.3 mm
  • Outer diameter: 2.6 mm
  • Length: 60 mm
  • Material: Cross-linked polyolefin with a stainless steel reinforcing rod for mechanical strength
  • Operating temperature: -45°C to +100°C
  • Shrink temperature: Minimum 120°C for full recovery These dimensions provide a snug fit over the fiber splice while the reinforcing rod maintains mechanical integrity and prevents fiber breakage during installation .
Selection Considerations
  1. Measure the fiber diameter: Use calipers to measure the largest part of the fiber or splice to ensure the tubing can slide over it before shrinking .
  2. Shrink ratio: Most fiber optic heat shrink tubing has a 2:1 shrink ratio, meaning it will shrink to half its original diameter when heated .
  3. Length: The tubing should fully cover the splice and provide some overlap on both sides for protection. Standard 60 mm lengths are widely used for single fiber splices .
  4. Material properties: Polyolefin tubing with a stainless steel core is preferred for durability, moisture resistance, and maintaining optical transmission properties .
Application

Heat shrink tubing is used to protect fusion splices from mechanical stress, moisture, and environmental factors. The tubing is placed over the splice, heated to shrink, and the reinforcing rod ensures the splice remains rigid and secure. Clear tubing allows visual inspection of the splice before shrinking . By following these sizing guidelines and material recommendations, fiber optic splices can achieve reliable mechanical protection and long-term performance.

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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