Telecom fiber is just one branch of the fiber family. In industrial, medical, and research applications, the more common and flexible choice is often glass fiber. Glass fiber has a core and cladding both made of glass materials — typically multi-component glass fiber, which consists of multiple glass compositions and allows flexible adjustment of refractive index and numerical aperture. Four Key Characteristics of Glass Fiber High temperature resistance: Operates reliably at up to 350°C and withstands autoclave sterilization. Plastic optical fiber (PMMA) typically maxes out around 70°C. Large acceptance angle: Numerical aperture can reach 0.5 or higher, capturing light from a wide angle. Paired with broad-angle light sources, it delivers larger illumination areas. Chemical inertness: Resists most solvents and cleaning agents. Safe for direct contact with human tissue in medical applications. Good flexibility: At 50 microns in diameter, it can bend to a radius of about 5 mm — more flexible than most people expect. Glass Fiber vs. Plastic Fiber — How to Choose? Need high-temperature sterilization, long-distance transmission, or high-precision imaging? Choose glass fiber. Short distance, low cost, general illumination? Plastic fiber will do. Where Is It Used? Medical: Endoscope light guides, surgical illumination, laser therapy — roughly 75 million endoscopy procedures performed globally each year depend on glass fiber. Industrial inspection: AOI, machine vision illumination, flame detection. Research and labs: Spectroscopy, fluorescence detection, microscope illumination. Specialty environments: High-temperature sensing, nuclear industry applications. Market Opportunity The global medical glass fiber market was valued at approximately $110 million in 2025 and is projected to reach $157 million by 2034. The adoption of minimally invasive surgery and endoscopy technology upgrades are the primary growth drivers. Hecho Technology has nearly two decades of experience in glass fiber, offering multi-component glass fiber and quartz fiber products for medical device integration, industrial inspection illumination, and research optical transmission — with OEM/ODM customization available. For inquiries, contact the Hecho technical team. About Nanjing Hecho Technology Co., Ltd. Hecho Technology focuses on optical transmission solutions for medical, industrial, and scientific applications. Products include plastic optical fiber, glass fiber, quartz fiber, fiber bundles, light guides, and sensors, with OEM/ODM customization available.