Polymer Layered FIMT

Polymer Layered Steel Tube

We often combine Fiber in Metal Tube (FIMT) cables with additional polymer layers to solve particular challenges. The protective layer can be made up of standard polymers or high-performance polymers.

The polymer-protected optical cable has increased impact resistance and excellent durability against mechanical stress. In addition, it allows for greater elasticity and weighs less than extra metallic layers. It’s rodent resistant, making it suitable for direct-buried applications. Upon request, the polymer can include flame retardants and comply with low smoke zero halogen (LSZH) requirements.

The polymer layered steel tube is ideal for umbilical cable solutions in subsea umbilical applications and for the Defense and Marine industries, where elasticity, low weight, and high strength are required. If you think our Polymer Layered FIMT is suitable for you, get in touch. Our experts are ready to discuss your project with you.


Product abbreviation PLF
Cable usage Data Transm. & Sensing
Outer diameter 2.2 mm up to 12.0 mm
Maximum fiber count 144 (250µm) and 192 (200µm)
Polymer materials Multiple options available
Steel materials Wide range possible
Filling compound H2 absorbing optionally
Approx. Cable weight 7 kg and up
Operational temperature range -40°C up to +85°C
Maximum continuous length Up to 20 km

All values, product specifications and other given data are subject to change without notice to improve reliability, function, design or otherwise. Information contained in this data sheet are up-to-date as at the date of issue. As NBG cannot control or anticipate the conditions under which this product may be used, each user should review the information in specific context of the planned use. To the maximum extent permitted by law, NBG will not be responsible for damages of any nature resulting from the use or reliance upon the information contained in this data sheet.

Product overview created by Patrick Weissinger – 21.03.2019

Optical fibers

Metal tube

Plastic jacket


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