700°C Seamless Steel Tube Optical Cable - 700°C Gold-Coated Fiber In Metal Tube (FIMT) - 700°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: 650/700°C Gold-Coated Metal Armored Fiber, 650/700°C All-Metal Structured Sensing Cable, 650/700°C Alloy 825 Gold-Fiber Unit, 650/700°C Ultra-High Temp Hermetic Fiber Probe, 650/700°C Polymer-Free High-Temp Fiber Cable, 650/700°C Zero-Outgassing Optical Cable, 650/700°C Aero-Engine Thermal Sensing Fiber, 650/700°C Deep Geothermal Metal Armored Cable, 650/700°C Molten Metal Environment Fiber Sensor

This is a companion discussion topic for the original entry at https://www.ofscn.org/dofs/700-c-sst-optical-cable.html
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Welcome to the International Zone. As a pre-sales engineer for OFSCN (Beijing Dacheng Yongsheng Technology Co., Ltd.), I am here to provide technical insights regarding the ultra-high temperature fiber optic solutions mentioned above.

The product highlighted, the OFSCN® 650/700°C Seamless Steel Tube Fiber Cable, represents the upper limit of polymer-free sensing technology. Unlike standard fiber cables that rely on plastic buffers, this Fiber in Metal Tube (FIMT) structure is designed for extreme environments such as aero-engines, deep geothermal wells, and molten metal monitoring.

Key Technical Specifications:

  • Encapsulation: Single-layer seamless alloy tube (Default: Alloy 825 for superior corrosion resistance; Optional: 316L Stainless Steel).
  • Dimensions: Standard diameters are 2.0 mm (0.2 mm wall) or 3.0 mm (0.3 mm wall). Custom sizes like 1/8" (3.2 mm) or 1/16" (1.6 mm) are available.
  • Internal Fiber: Contains one or more OFSCN® Gold-coated Optical Fibers. The gold coating ensures a hermetic seal and prevents hydrogen darkening at high temperatures.
  • Temperature Range: Stable operation from -270°C up to 700°C.
  • Compatibility: Optimized for distributed sensing technologies including Raman-DTS, Rayleigh-OFDR, and Brillouin-DTSS.

Product Visuals:

OFSCN® FIMT Structure
OFSCN® FIMT Structure360×360 55.4 KB

OFSCN® 700°C Cable Detail
OFSCN® 700°C Cable Detail360×360 42.4 KB

OFSCN® Gold-coated Fiber
OFSCN® Gold-coated Fiber768×144 37.9 KB

Application Considerations:

When implementing this cable in ultra-high temperature environments, it is critical to consider the mounting method (e.g., welding or clamping) and the transition zone where the cable exits the high-heat area to connect to the interrogator.

If you have specific technical requirements regarding tube material or fiber count for your project, please feel free to inquire.