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See Chinese contents: GB/T 3903.9-2021 GB/T 3903.9-2021: Footwear -- Test methods for insoles -- Heel pin holding strength
This document describes a method for determining the pin holding strength of footwear insole materials to prevent pins from penetrating the insole. This document applies to assembled insoles with heels, as well as to insoles of external heels fixed with pins.
