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2026-01-22•6 min bench test•VIESUNCO Materials Science Team

Shoe Cushioning Benchmark: Why EVA Hardens After 300km While Microcellular TPE Retains >90% Bounce

Why do running shoes lose their initial bounce? Dynamic fatigue data comparing EVA, PU, and supercritical TPE across 100,000 continuous compression cycles.

#Fatigue Test#Compression Set#EVA vs TPE#Midsole Bounce#Lab Test
Shoe Cushioning Benchmark: Why EVA Hardens After 300km While Microcellular TPE Retains >90% Bounce

1. Why Standard EVA Loses Cushioning

EVA cell walls permanently collapse under cyclic human gait loading:

Automated Piston Impact Fatigue Testing Machine in Action
▲ Automated Piston Impact Fatigue Testing Machine in Action

2. 100,000-Cycle Dynamic Impact Benchmark

  • EVA: 15%–22% permanent thickness loss; rebound drops to 48%.
  • Supercritical TPE: <4.5% thickness loss; maintains >72% kinetic energy return at 125g weight.

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