The Definitive Guide to the Ross Flexing Test

The durability and integrity of shoe soles under repeated flexing are critical performance parameters directly impacting product longevity, consumer safety, and overall value. Footwear is subjected to constant bending stresses during normal use, particularly in the forefoot area, making the sole’s resistance to crack initiation and propagation a fundamental indicator of quality. The Ross Flexing Test as one of the most established and widely recognized laboratory methods within the footwear industry for evaluating this essential characteristic.

This standardized test rigorously simulates the dynamic flexing action experienced by a shoe sole in service. By subjecting a precisely prepared specimen containing an artificial notch to controlled, repetitive bending cycles, the test quantifies the material’s inherent ability to resist the growth of this initial flaw. The resulting “notch growth rate” provides manufacturers, material suppliers, and quality control laboratories with a vital, objective metric for comparing materials, optimizing formulations, assessing production consistency, and ensuring compliance with performance specifications and industry standards.
Internationally recognized standards, primarily ASTM D1052 (“Standard Test Method for Measuring Rubber Deterioration—Cut Growth Using Ross Flexing Apparatus”) and ISO 5423 (which references similar methodology), govern the precise procedures for conducting the Ross Flexing Test. This document details the specific methodology based on ASTM D1052, encompassing the test’s purpose, fundamental principle, meticulous specimen preparation requirements, and the step-by-step operational protocol. Adherence to this defined methodology is paramount to generating reliable, reproducible, and comparable test data that accurately reflects the flex crack resistance performance of shoe sole materials under evaluation.

The standard of ross flexing test

The Ross flexing test is one of the common test items for footwear. It primarily measures the ability of footwear materials to resist cut growth after continuous flexing. Common test standards include ASTM D1052 and ISO 5423.
ASTM D1052: Measuring Rubber Deterioration—Cut Growth Using Ross Flexing Apparatus
ISO 5423: Moulded plastics footwear – Lined or unlined polyurethane boots for general industrial use – Specification

Ross flexing tester

Ross Flexing Tester is used for determining the ability of shoe sole to resist crack growth when subjected to repeated bend flexing. It’s not only suitable for all kinds of flexible vulcanized rubber soles, but also suitable for other flexible soles. Mount the pierced strip test piece on the instrument in a way the cut is right above the middle of the rotating rod. The test piece is bent freely over the rod to a 90° angle and the cut length is measured at frequent intervals, to determine the cut growth rate and assess the flexing resistance performance.

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