Say No to "Fiber Darkening": How OFSCN® 300°C SST Optical Cable Overcomes High-Temperature Hydrogen Aging

In oil drilling, natural gas wells, or high-temperature chemical reactors, environments are often saturated with high-pressure hydrogen gas. For ordinary optical cables, once the operating temperature exceeds 150°C, hydrogen molecules permeate like "ghosts" into the silica (SiO2) structure of the fiber, causing a rapid increase in signal attenuation. This phenomenon, known as "Hydrogen Darkening," turns the fiber black and interrupts signals, ultimately leading to the total collapse of the monitoring system.

The OFSCN® 300°C SST seamless stainless steel tube high-temperature optical cable, developed by Beijing Dacheng Yongsheng Technology Co., Ltd., is specifically engineered to terminate "hydrogen aging" at its root.

1. Core Defense: 100% Hermetic "Seamless Steel Wall"

Traditional armored or loose-tube cables often have microscopic gaps or material pores in their jackets, which hydrogen molecules can easily penetrate under high temperature and pressure.

• Seamless Laser Welding Technology: The OFSCN® 300°C SST utilizes 316L stainless steel strips, formed into a continuous metal tube via high-precision longitudinal laser welding. This process creates a jacket without any seams, forming a perfect physical barrier.
• Hydrogen Shielding Performance: This Fiber-in-Metal-Tube (FIMT) structure can withstand external pressures exceeding 100 MPa and effectively blocks the intrusion of hydrogen ions throughout years of service.

2. Coating Technology: Secondary Protection with 300°C Polyimide (PI)

In addition to the external steel tube defense, the coating of the internal fiber is crucial.

• Specialized PI Coating: The internal fibers utilize OFSCN®’s self-developed 300°C-grade Polyimide coating. Unlike ordinary plastic coatings, this material does not decompose or produce volatiles at high temperatures, maintaining a stable chemical state long-term.
• Thermal Expansion Matching: The 15-micron ultra-thin coating design achieves an ultimate balance of thermal expansion coefficients between the fiber, the coating, and the steel tube. This prevents chemical reactions induced by stress micro-cracks during 300°C thermal cycling.

3. Economic Value: One-Time Deployment, Long-Term Benefit

Why do global customers choose OFSCN® 300°C SST when facing high-temperature hydrogen environments?

• Extremely Low Maintenance Costs: Solving the hydrogen aging problem means there is no need for frequent sensor cable replacements. In scenarios like deep wells where replacement costs are exorbitant, this can save customers millions of dollars in maintenance expenses.
• Long-Term Data Consistency: Only a fiber free from "darkening" can guarantee that Distributed Temperature Sensing (DTS) accuracy will not drift over a 5 to 10-year period.
• Enhanced Corrosion Resistance: The 316L or optional Alloy 825 jacket not only shields against hydrogen but also provides excellent resistance to acid and chloride ion corrosion, ensuring that the physical lifespan synchronizes with the optical lifespan.

4. Conclusion: Letting Light Signals Travel Freely at 300°C

Safety in production requires not only instantaneous precision but also long-term stability. By specializing in material encapsulation technology, Beijing Dacheng Yongsheng Technology Co., Ltd. has granted optical fibers "immunity" in high-temperature hydrogen environments.

The OFSCN® 300°C SST high-temperature optical cable injects lasting vitality into your industrial monitoring system through leading hydrogen shielding technology.

Contact Information:

• Company Name: Beijing Dacheng Yongsheng Technology Co., Ltd.
• Official Website: https://www.ofscn.org
• Product Details: https://www.ofscn.org/dofs/300-c-sst-optical-cable.html