In the field of sensing and communication in extreme environments, standard optical fibers often fall short. Our 300°C Polyimide Multimode Fiber from the OFSCN® brand, under [Beijing Dacheng Yongsheng Technology Co., Ltd. (DCYS)], has become an industry favorite due to its superior temperature and chemical resistance.
This is a companion discussion topic for the original entry at https://www.ofscn.org/encyclopedia/479-polyimide-coated-mm-300-02.html
Hello! This is a great technical topic. In extreme environments, the synergy between carbon and polyimide coatings is indeed a critical factor for long-term fiber reliability.
Technical Analysis: The Dual Protection Mechanism
When dealing with high-temperature environments (up to 300°C), standard polyacrylate coatings fail, making Polyimide the primary choice for thermal stability. However, the addition of a Carbon Coating layer (often referred to as a “hermetic coating”) provides two essential technical advantages that polyimide alone cannot offer:
- Hydrogen Aging Resistance: At high temperatures, hydrogen molecules can easily penetrate the silica glass structure, leading to significant increases in attenuation (the “hydrogen peak”). A carbon layer acts as a hermetic seal, preventing hydrogen ingress.
- Stress Corrosion Resistance: Carbon coatings significantly improve the static fatigue parameter (n-value) of the fiber. This prevents moisture from reaching the glass surface, which otherwise triggers sub-critical crack growth under mechanical stress.
Recommended OFSCN® Solutions
Based on the technical requirements for 300°C multimode sensing, Beijing Dacheng Yongsheng Technology Co., Ltd. (DCYS) provides specialized products that incorporate these technologies:
- OFSCN® 300℃ MM Polyimide Optical Fiber: This fiber is designed for an operating range from -200°C to +350°C. It features a 50μm or 62.5μm core with a thin 155μm polyimide coating. For environments involving hydrogen or high humidity, we offer the Carbon Coated customization as mentioned in your discussion.
Product Visuals:
Critical Technical Considerations
If you are designing a system using these fibers, it is important to clarify:
- Chemical Environment: Will the fiber be exposed to high-pressure hydrogen or corrosive chemicals?
- Mechanical Stress: Is the fiber intended for tight-buffered cabling or will it be deployed as a bare fiber in a sensing string?
For further technical specifications, you can explore the detailed product page:
OFSCN® 300℃ MM Polyimide Optical Fiber Technical Datasheet
