ETPU foam molding
// The classic soft high-rebound bead foam: over 65% rebound, over 90% compression recovery, still elastic at −25°C, durable under repeated impact. It has the most public data of any elastomer here and the most predictable behaviour — raise the expansion ratio and rebound, tensile and elongation all go up while hardness comes down.
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 ETPU 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 | 180–220 kg/m³ (single bead about 140–200); molded parts 200–300 kg/m³ depending on fill | ✅ |
| Expansion ratio | about 10× | ✅ |
| Rebound | over 65% | ✅ |
| Compression recovery | over 90% — low permanent set | ✅ |
| Minimum service temperature | −25°C, retaining high elasticity and softness | ✅ |
| Known relationship | Expansion ratio up gives rebound up, hardness down, tensile up, elongation up | 📊 |
| Molding conditions | Steam chest 0.6–2.2 bar / 110–130°C; one grade molds steam-free at 100–150°C for 1–30 min | ✅ |
| Weather resistance | Must be typed: aromatic MDI-based yellows badly, aliphatic HDI/IPDI-based weathers well but costs more. Tell us if the part goes outdoors | 📐 |
| Compression / tensile / elongation / tear / conductivity / max temperature | No public figure — we request it with your enquiry | ⬜ |
Reference commercial grades
| Grade | Supplier | Notes |
|---|---|---|
| Infinergy® 32-100 U10 | BASF | Molded part density 200–300 kg/m³, forming 100–150°C for 1–30 min |
| Infinergy® 241 | BASF | Steam-free molding option |
Performance running midsoles
The reference application for this material.
Sports protective gear
Rebound survives being hit repeatedly.
Puncture-proof tyre inserts
Load and recovery, with no air to lose.
Why we can run it
// Soft elastomer beads need steam temperature and pressure held precisely inside a narrow window — a standard EPP machine is limited here even though the material itself is well documented.