EPEBA foam molding
// 80–85% energy return, against 70–75% for TPU and 60–65% for EVA, at 20–30% less weight for the same stack height. It stays elastic when EVA goes stiff in the cold, and takes millions of flex cycles without measurable decay. It is also the most demanding material in the hall: mold drainage and vacuum have to be right, or the part is not.
The figures on this page are published industry and supplier values for this material family, not measured DBM product data — we do not have our own grade-level test results for EPEBA yet. They are accurate enough to size a part and to rule options in or out. Final numbers are confirmed by us in writing against your part before you commit to anything.
| Property | Value | Source |
|---|---|---|
| Foam density | about 140 kg/m³ | ✅ |
| Energy return | 80–85%, against TPU 70–75% and EVA 60–65% | ✅ |
| Weight advantage | 20–30% lighter than TPU at the same stack height | ✅ |
| Hardness | Asker-C 38 — the softest measured value in our range | ✅ |
| Cold behaviour | Stays elastic where EVA stiffens | ✅ |
| Fatigue | Millions of flex cycles with no significant structural decay | ✅ |
| Structure | Block copolymer — rigid polyamide segments with flexible polyether segments, very low hysteresis loss | ✅ |
| Foaming route | Supercritical CO₂ / N₂ saturation, then rapid pressure release | ✅ |
| Compression / tensile / tear / conductivity / service temperature | No public figure for the foam form — we request it with your enquiry | ⬜ |
Reference commercial grades
| Grade | Supplier | Notes |
|---|---|---|
| Pebax® Rnew | Arkema | Bio-based PA11, Shore D 30–80; bio-content grades 26–28%, castor-derived |
Elite marathon racing midsoles
Where energy return decides the product.
Lightweight high-rebound protective gear
Return and weight together, without the TPU penalty.
Why we can run it
// Needs exceptionally high mold drainage and vacuum control — the practical reason this material stays out of most catalogues. Careful with public data: nearly every density and hardness figure online for PEBA is for unfoamed resin, not foam.