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Test device designed for the determination of the extension and tensile strength of the surface (ball method) in leather samples by means of a testing device that adapts to a Universal Testing Machine. According to the Standards: UNE DIN EN ISO 3379
These international standards specify a test method for determining the extension and strength of the finished flower or leather surface. This method is applied to all flexible leathers and is especially suitable for determining the suitability when assembling leather for shoe upper.