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See Chinese contents: GB/T 3903.1-2017 GB/T 3903.1-2017: Footwear -- Test methods for whole shoe -- Flexing resistance
This Standard specifies the test methods for flexing resistance of whole shoes or soles. This Standard is applicable to whole shoes and soles. This Standard is not applicable to the whole shoes or soles with a height greater than 70mm, or a thickness of the sole flexion site greater than 25mm, or a bending angle less than 45-degree after rigidity is tested according to the provisions of 8.4.1 in GB/T 20991-2007.
