Polyimide (PI) Coated Fibers with Multi-Layer Technology in long lengths and high quantities for singlemode and multimode (OM1, OM2, OM3) fibers for use in a temperature range of −190 °C to +385 °C

– Multi-layer technology with greater outer thickening in long piece lengths of up to 10 km
– Increased tensile strength and fiber lifetime
– Improved scratch and breakage resistance
– Available as standard, bend-insensitive and radiation-hard fibers

Many novel applications for optical metrology require polyimide (PI) coated fibers for the extreme temperature range of −190 °C to +385 °C in long lengths, high quantities and for various fiber types. For these applications, we have developed a new, multi-layer technology for you for PI-coated fibers in piece lengths of up to 10 km. The positive effects also help to extend fiber lifetime while improving tensile strength. As the PI coat thickens the fibers by up to 45 µm, this also noticeably improves scratch and breakage resistance.

There are many applications for fibers and optical cables in this extreme temperature range. These include spectroscopy, Fiber Bragg Grating sensor systems and process analysis. Requirements for technical monitoring of areas involving extreme temperatures exist in the Manufacturing, Energy (Geothermal, Oil & Gas), Aerospace and Automotive industries. For these applications, the materials used limit the application temperature range for the optical fibers. For applications at higher temperature ranges, all optical fibers based on fused silica glass can be optionally equipped with heat-resistant coating materials. Polyimide-coated fibers offer a convenient temperature “window” of −190 °C to +385 °C.

Your benefits at a glance:

  • Multi-layer technology
    • For improved tensile strength and fiber lifetime
    • Improved scratch and breakage resistance
  • Long piece lengths of up to 10 km
    • Enables new applications needing long lengths greater than 5 km
  • Glass diameter of up to 125 µm
  • Outer diameter of up to 170 µm for unique mechanical properties
    • Approx. 45 µm outer thickening of fibers
  • Applications at temperatures of −190 °C to +385 °C
  • Reduced outgassing in vacuum applications compared with acrylate
  • Coating-cladding eccentricity <2%
  • Wide range of fiber types available
    • Singlemode (09/125)
    • Multimode
      • OM1, OM2, OM3
    • Bend-insensitive
    • Radiation-hard
  • Optional additional protection from ultra-high-temperature jacket to protect PI-coated fibers, with
    • Significantly better abrasion resistance
    • Excellent mechanical properties during laying
    • Very easily strippable during assembly
    • For an extended temperature range of −100 °C to +260 °C

Classification of usage temperatures:

  • −40 °C to +150 °C ⇒ High-temperature acrylate jacket
  • −40 °C to +180 °C ⇒ Silicone jacket
  • −40 °C to +150 °C ⇒ ETFE jacket
  • −100 °C to +260 °C ⇒ Ultra-High-Temperature Jacket (UHTJ)
  • −190 °C to +385 °C Polyimide-coated fibers
  • −269 °C to +400 °C ⇒ Aluminium coating
  • −269 °C to +700 °C ⇒ Gold coating

Product portfolio:

Order options:

  • Fiber type
    • Singlemode
    • Multimode
  • Bend-insensitivity
  • Radiation-hardness
  • Fiber length
    • >100 m
  • Optional:
    • Ultra-high-temperature-jacket to protect PI-coated fibers
      • With significantly improved abrasion resistance, excellent mechanical properties during laying and very easily strippable during assembly
      • For an extended temperature range of −100 °C to +260 °C
    • Assembly
    • Cables


  • Spectroscopy
  • Fiber Bragg Grating (FBG) sensor technology
  • Process analysis
  • Manufacturing
  • Energy (geothermal, oil and gas)
  • Aerospace
  • Automotive
  • Tunnel monitoring
  • Pipeline monitoring
  • Mining

You are welcome to contact us with your queries and enquiries about how you can benefit from the improved safety achieved by deploying PI-coated fibers in long lengths and with improved durability.

Additional option Ultra-High-Temperature Jacket

Talk to us about your requirements for customer-specific cables using the new Ultra-High-Temperature Jacketand we will identify a solution tailor-made to your application.

Benefits of the Ultra-High-Temperature Jacket (UHTJ)at a glance:

  • Excellent mechanical properties
  • Very low friction coefficient
  • Very easily strippable
  • Excellent chemical resistance
  • Self-extinguishing, flame-retardant
  • Non-conducting surface (EMC)
  • Low-cost alternative to metal coatings (aluminium, gold)