85°C Seamless Steel Tube Optical Cable - 85°C Fiber In Metal Tube (FIMT) - 85°C High Temperature Optical Cable - Communication / Sensing Optical Cable - Picture parameters - Manufacturer brand price - DCYS - ofscn.org

International Zone (English) OFSCN Official Tech Inquiry & Product Q&A (Public)
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Iven | www.ofscn.org Last Updated: 13 February 2026

Aliases: Armored Micro SST Fiber Cable, Rodent-Proof Metal Tube Fiber Cable, Hermetic Stainless Steel Fiber Unit, FIST (Fiber In Steel Tube) Cable, Ultra-Slim Seamless SST Sensing Cable, Single-Layer SST Optical Unit, Utility Gallery Specialty Fiber Cable, Subsea-Rated SST Fiber Sensing Cable, Structural Health Monitoring (SHM) Fiber Cable

This is a companion discussion topic for the original entry at https://www.ofscn.org/dofs/85-c-sst-optical-cable.html
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The OFSCN® 85°C Seamless Steel Tube Optical Cable (also known as FIMT - Fiber In Metal Tube) is a specialized armored micro-optical cable designed for both communication and distributed fiber optic sensing in demanding environments.

Technical Characteristics

Unlike traditional flame-retardant or plastic-jacketed cables, this product utilizes a seamless stainless steel tube (typically 304 or 316L) as its primary protective layer. This construction provides several critical technical advantages:

  • Mechanical Protection: It offers superior crush resistance and is effectively rodent-proof and insect-proof.
  • Hermetic Sealing: The seamless metal tube prevents moisture, hydrogen, and corrosive gases from reaching the internal fibers.
  • High Temperature Stability: Rated for continuous operation up to 85°C, maintaining structural integrity where standard PVC or LSZH cables might soften.
  • Compact Form Factor: Standard diameters are available at 2.0mm or 3.0mm, with customizable options like 1/8 inch or 1/16 inch for tight-space installations.

Fiber Configuration

The cable can be populated with various fiber types depending on your application:

  • Single-mode: OFSCN® G.652D or G.657 series.
  • Multi-mode: OM2, OM3, or OM4 for high-bandwidth data transmission.
  • Hybrid: Combinations of single-mode and multi-mode fibers within a single tube.

Standard Product Visuals

OFSCN® 85°C SST Cable 1
OFSCN® 85°C SST Cable 1360×360 55.4 KB

OFSCN® 85°C SST Cable 2
OFSCN® 85°C SST Cable 2360×360 44.4 KB

OFSCN® 85°C Internal Fiber
OFSCN® 85°C Internal Fiber768×144 35.9 KB

Applications

This cable is widely used as a Distributed Fiber Optic Sensor for:

  1. Structural Health Monitoring (SHM): Monitoring strain or temperature in bridges, tunnels, and utility galleries.
  2. Distributed Sensing: Compatible with DTS (Raman), DAS (Rayleigh), and DTSS (Brillouin) technologies.
  3. Subsea/Harsh Environments: Providing a pressure-resistant housing for fibers in underwater or underground deployments.

For more detailed specifications, you may visit the official product page:
OFSCN® 85°C Seamless Steel Tube Optical Cable