Breaking the Limits: Long-Term Reliability Analysis and Data Report of OFSCN® 350°C Polyimide Fiber

Introduction: Challenging Industrial Demands in Extreme Temperatures

With the development of industrial automation, oil and gas exploration, and aerospace technology, the demand for long-term optical fiber reliability in ultra-high and ultra-low temperature environments and severe temperature fluctuations is increasing. Traditional acrylate-coated optical fibers rapidly age and degrade in performance when exposed to temperatures exceeding 300°C or even 350°C , making them unable to meet the application requirements of extreme environments.

OFSCN® 350°C polyimide (PI) single-mode optical fiber is designed to address this challenge. This report will focus on analyzing the long-term reliability of this fiber and provide key performance test data.

1. Core guarantee: thermal stability of polyimide coating

The optical fiber adopts high-performance polyimide (PI) coating, whose thermal decomposition temperature is much higher than that of organic polymers, which is the basis for achieving extreme temperature resistance.

Characteristics	OFSCN® 350 °C PI Fiber	Traditional acrylic optical fiber	Performance advantages
Maximum operating temperature	+350 ℃	+85 ℃∼ +125 ℃	Improve the temperature resistance limit by about 200 °C .
Minimum operating temperature	-200 ℃	−40 ℃ to −60 ℃	Covers ultra-low temperature liquid nitrogen environment applications.
Long-term stability	Very low gas evolution and mass loss	Prone to carbonization, cracking and delamination at high temperatures	Ensure that the mechanical and optical properties of optical fibers do not deteriorate in high temperature environments.

2. Long-term reliability data: accelerated aging test

The long-term reliability of optical fiber cannot rely solely on its transient temperature tolerance. Beijing Dacheng Yongsheng Technology (DCYS) conducted rigorous accelerated aging tests on OFSCN® PI optical fiber to evaluate its attenuation stability at a continuous high temperature of 300°C .

Test item: High temperature long-term attenuation stability test

• Test conditions: Continuous exposure in a 300 °C constant temperature oven.
• Test wavelength: 1500nm
• Test results (typical data):

Test time (hours)	Attenuation increment ΔA (dB/km)	Attenuation change rate
Initial value	<0.8 dB/km	-
500	<0.05 dB/km	Very low change
1000	<0.10 dB/km	Maintain stability

Conclusion: After 1000 hours of rigorous continuous testing at 300°C , OFSCN® PI optical fiber showed minimal attenuation increment, fully demonstrating its highly stable optical performance in long-term high-temperature operating environments , providing reliable protection for the long-term operation of customer projects.

3. Key Performance: Maintaining Optical Performance Over a Wide Temperature Range

In addition to high temperatures, maintaining performance under extreme temperature changes is also crucial.

1. Temperature Cycling Performance (TCC):
   • OFSCN® PI optical fiber exhibits excellent microbending loss resistance in temperature cycle tests from -200°C to +350 °C .
   • The thermal expansion coefficient difference between the polyimide coating and the quartz material is small, which effectively avoids attenuation spikes and coating cracking caused by thermal stress, ensuring the signal integrity of the optical fiber in complex environments such as aerospace and low-temperature experiments .
2. Mechanical fatigue life:
   • The fiber's tensile strength reaches 100kpsi , far exceeding industry standards. These robust mechanical properties ensure it can withstand sustained stress loads in high-temperature, high-pressure oil and gas wells or during the manufacture of fiber-optic metal tube (FIMT) cables, ensuring the fiber's mechanical fatigue life .

4. Value-added options: carbon seal and hydrogen damage resistance

For high-risk industries like oil and gas, high temperatures are often accompanied by high pressure and hydrogen corrosion issues. We offer polyimide + carbon coating (carbon seal) options to further enhance long-term reliability:

• Anti-hydrogen loss capability: The carbon sealing layer forms a dense barrier between the optical fiber cladding and the PI coating, effectively preventing hydrogen molecules from diffusing and penetrating into the fiber core at high temperatures, fundamentally eliminating the increase in optical fiber attenuation caused by hydrogen loss and greatly extending the service life of the optical fiber in hydrogen-containing environments .

5. Summary and Procurement Information

OFSCN® 350°C polyimide single-mode optical fiber not only achieves performance breakthroughs across a wide temperature range of -200°C to +350 °C , but also passes rigorous accelerated aging and environmental cycling tests, demonstrating its long-term stability and reliability under extreme conditions .

Choosing OFSCN® PI optical fiber means choosing to provide a lasting guarantee for your core sensing and communication systems in the harshest environments .

Company Name	Beijing Dacheng Yongsheng Technology Co., Ltd. Yongsheng Technology Co., Ltd. - DCYS)
Product Brand	OFSCN®
Product Model	300℃ SM polyimide optical fiber (maximum operating temperature 350℃)
Product details page	https://www.ofscn.org/optical-fibers/polyimide-coated-sm-300.html

Contact us now to get 350℃ grade specialty optical fiber solutions and a detailed quote!

All data in this document are typical values. Please refer to the actual supply contract and product data sheet for specific specifications and test reports.