0.4mm bending radius, 96% mass production yield: Stress reconstruction and process path of Bourne Optics UTG
2026-09-07 13:42Products & Apps🔥 47.2 heat score
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In September 2026, Born Optical announced the latest mass-production technical specifications for its ultra-thin flexible glass (UTG). The thickness of this product ranges from 30 to 50 micrometers, with the 30-micrometer version surpassing the traditional chemical ion strengthening glass’s thinning limit of 40 micrometers, achieving a light transmittance of 93%. In terms of durability, this UTG features a bending radius as low as 0.4 millimeters; it maintains no scratches after 500,000 dynamic bending tests without performance degradation, with a maximum bending count of up to 2 million times. Technologically, Born Optical uses ion exchange strengthening technology to create a compressive stress layer on the glass surface, enhancing wear resistance and scratch resistance by 5 times. Additionally, a stepped chamfering process disperses stress, a slit coating process ensures optical consistency, and alkali metal ion exchange provides physical protection. Currently, this technology has solved the bottleneck of traditional CPI solutions, which can only withstand 200,000 cycles and easily develop plastic scratches. Related products have entered the supply chain of leading models and are produced on a highly automated production line at the Huizhou manufacturing base.
The global shipments of foldable smartphones are expected to increase by 21% in 2026. The penetration rate of UTG (ultra-thin flexible glass) has exceeded 70%. The UTG cover glass developed by Born Optics reduces the thickness to 30 micrometers and narrows the bending radius to 0.4 millimeters, achieving 2 million bends without any scratches or performance degradation. This technology disperses stress through a “stepped chamfering” process, combined with high-precision coating and surface stress layer protection, solving the bottleneck of CPI solutions, which can only withstand 200,000 bends and are prone to plastic scratches. Born Optics’ UTG products have already entered the supply chain of leading models, and its sandblasting protection technology fills a gap in domestic processing.
Born Optical announced its latest mass-production technical specifications for UTG: the bending radius is as low as 0.4 millimeters, with no scratches or performance degradation after 500,000 dynamic bends, and the maximum number of bends reaches 2 million times. The mass-production yield remains stable at over 96%. The thickness range of this UTG is 30 to 50 micrometers; the 30-micron product has surpassed the traditional CPI’s thinning limit of about 40 micrometers, with a throughput rate of 93%. Born Optical uses ion exchange strengthening technology to create a compressive stress layer on the glass surface, enhancing wear resistance and scratch resistance by 5 times compared to conventional products. In terms of technical implementation, its leadership stems from three process synergies: first, edge processing is done in stepped chamfering, distributing stress evenly along the chamfer arc instead of concentrating it at a single point; second, a narrow slit coating process is used, with precision 10 to 20 times that of silk printing, ensuring optical consistency in the bending area; third, physical protection is achieved through alkali metal ion exchange. Born Optical has a highly automated UTG production line at its production base in Huizhou, covering all processes including cutting, thinning, strengthening, polishing, and coating.