1. Key Practical Differences for Molders
Many molders group all soft elastomers as rubber, but SEBS-based TPE and SBS-based TPR behave very differently in actual production:
- Weathering: TPE withstands outdoor UV without getting sticky; TPR requires heavy antioxidant loading for outdoor use.
- Surface Feel: TPE offers a dry, velvety touch; TPR provides higher surface grip.
2. Shopfloor Processing Comparison
| Parameter | SEBS TPE Grade | SBS TPR Grade | Vulcanized Rubber |
|---|---|---|---|
| Barrel Temps (Rear/Mid/Nozzle) | 165°C / 180°C / 190°C | 150°C / 165°C / 175°C | Requires 160°C+ vulcanization |
| Service Temperature | -50°C to +115°C | -20°C to +70°C | -40°C to +110°C |
| Regrind Ratio | 15% - 25% recyclable | 10% - 20% recyclable | 0% (Thermoset scrap) |
| Cycle Time | 18 - 30 seconds | 15 - 25 seconds | 3 - 8 minutes |
