Semi-Finished Products

Fiber in (Stainless) Steel Tube (FIST)

Used for stationary installation when the optical fiber needs extra protection from mechanical damages.


Optical fiber


Marking thread


Water-blocking gel


Stainless steel tube

Up to 48 optical fibers in a tube

Small size

Fiber count up to 1...48
Outer diameter, mm 1.1...7
Inner diameter, mm 0.8...6.2
Module wall thickness, mm 0.15; 0.2; 0.4
Optical fiber excessive length, % 0...0.8
Material of steel module (Stainless steel) 1.4301. 1.4404
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Operation temperature -60°С…+70°С
Installation temperature -30°С…+50°С
Transportation and storage temperature -60°С…+70°С
Minimum bending radius 25x cable diameter
Life time 25 years