This standard specifies the two-point bending method for determining the flexibility of ultra-thin glass, applicable to ultra-thin glass with a thickness not exceeding 1.1 mm. It defines core aspects such as the test principle, specimen requirements, operating procedures, and result calculations. By subjecting the specimen to bending deformation under force applied at both ends, the critical radius of curvature at the moment of failure is used to characterize flexibility, providing a basis for material applications. Relevant testing instruments include a two-point bending testing machine equipped with bidirectional ball screws (with precisely adjustable sliding block speed), an imaging device (or digital camera) with a shooting frequency of 2–5 frames per second, paired with a height adjustment device, a standard circular calibration piece, and a protective cover. Auxiliary measuring tools such as digital calipers are also used to ensure the accuracy and safety of the tests.