Some industrial environments don't run "a little warm." They run at hundreds of degrees. Boilers, kilns, combustion chambers, engine exhaust ports — these places need monitoring, but electronic sensors can't go there. Neither can standard optical fiber. Plastic fiber softens at 85°C. Standard glass fiber loss rises sharply at elevated temperatures. High-temperature fiber is designed for these scenarios. How Is It Different from Standard Fiber? Material. High-temperature fiber typically uses high-purity quartz for the core and cladding, combined with a high-temperature coating (such as polyimide). Continuous operating temperatures can reach 400°C, with short-term tolerance even higher. Coating. Standard acrylic coatings degrade and yellow at high temperatures. High-temperature fiber uses polyimide or metal coatings — far superior in temperature and chemical stability. Transmission stability. In high-temperature environments, standard fiber loss increases with temperature. High-temperature fiber is specifically designed and screened to maintain stable optical performance under heat. Where It's Used Flame detection. Flame signals inside burners and boilers must be transmitted to external detectors. The high-temperature environment is a continuous challenge for the fiber. High-temperature sensing. Temperature monitoring in industrial furnaces, pipelines, and engines — fiber optic sensors must operate long-term under heat. Industrial borescope inspection. Visual inspection inside high-temperature equipment requires light guides that withstand on-site temperatures. Hecho Technology's customized optical fiber product line includes high-temperature fiber solutions, with specifications matched to operating temperature, wavelength, and connector requirements. Product page: https://www.gohecho.com/customized-optical-fiber_c8 If you need optical transmission or sensing in high-temperature environments, contact the Hecho technical team for selection assistance.