We work with TPU, PU and EVA. Rubber, PVC and ETPU are included for comparison.
Polyurethane density and hardness vary with the formulation.
For cushioned soles, section thickness and density are considered together. Filling and final dimensions are checked on a trial part.
Rubber compounds are selected for the outsole’s wear and grip requirements.
Compound hardness, lug geometry and ground surface jointly determine performance. Vulcanisation conditions factor into mould design.
Thermoplastic polyurethane is used in fine tread details and wear-prone sole zones.
The selected hardness influences tread flexibility. Filling of narrow grooves and thin edges is evaluated on a sample.
Polyvinyl chloride hardness can be adjusted through formulation.
For sandals and one-piece shoes, wall thickness, opening and demoulding are considered together.
Ethylene-vinyl acetate foams are used in lightweight footbeds and midsoles.
Expansion and cooling affect the dimensions of the foamed part. Final measurements are taken once the part has stabilised.
Expanded TPU beads are used in resilient foam sole components.
The beads bond inside the mould. Bead fusion and part density influence recovery after compression.
Scores from 0–5 compare broad material tendencies. Compound, density and sole geometry affect the result.
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