Purple tube for laying optical cables

Purple tubes are specialized conduits used to protect and manage fiber optic cables, often color-coded for identification and made from durable, flexible materials like Hytrel or PEEK.

Purpose and Function

Purple tubes are primarily used to protect optical fibers from mechanical damage, moisture, and environmental stress during installation and operation. They also help organize and identify fibers in splicing and distribution setups, reducing errors and improving efficiency during network maintenance or expansion .

Types of Purple Tubes

1. Loose Tubes: These are hollow tubes, often 0.9mm in diameter, made from flexible materials like Hytrel, suitable for indoor applications. They allow fibers to move freely inside, reducing stress and preventing microbending .
2. PEEK Convoluted Tubing: Purple PEEK (Polyether Ether Ketone) tubing is used in high-performance or industrial fiber optic systems. It offers high mechanical strength, chemical resistance, and flexibility, making it ideal for harsh environments or repeated handling .
3. Furcation/Buffer Tubing: Color-coded buffer tubes, including purple, are used to identify individual fibers during splicing. They are typically made from PVC, 900µm or 3.0mm, and are RoHS compliant, providing easy handling in splice enclosures .

Installation Considerations

• Indoor vs Outdoor: Hytrel loose tubes are suitable for indoor installations, while PEEK tubing can be used in more demanding environments.
• Length and Handling: Tubes are available in bulk rolls (e.g., 500m or 1000m) and are designed to be flexible for easy routing through conduits or enclosures .
• Color Coding: Purple is part of standardized color codes for fiber identification, helping technicians quickly match fibers during splicing and maintenance .
• Protection: When used in underground or exposed installations, tubes may be placed inside additional protective conduits or ducts to prevent physical damage and ensure longevity .

Summary

Using purple tubes for optical cables ensures fiber protection, easy identification, and efficient installation. Depending on the application, you can choose from Hytrel loose tubes for indoor use, PEEK convoluted tubing for industrial or high-stress environments, or color-coded buffer/furcation tubing for splicing and fiber management. Proper selection and installation improve network reliability and reduce maintenance challenges.