TPE and TPU are what give a rigid part a soft edge. They mould like a thermoplastic, bond to PP, ABS, PC and PA without adhesive, and cover the hardness range from a gel-soft 30 Shore A to a semi-rigid 70 Shore D. TPU brings abrasion resistance and load bearing; TPE brings a drier, more rubber-like feel and easier processing. Choosing between them is usually a question of feel versus wear.
Typical values for standard moulding grades. Exact figures depend on the specific compound or grade — confirm against your drawing before quoting.
Key properties
| プロパティ | Typical value |
|---|---|
| 密度 | 1.00 – 1.25 g/cm³ |
| Hardness range | 30 Shore A – 70 Shore D |
| Tensile strength | 10 – 40 MPa |
| Elongation at break | 300 – 700 % |
| Mould shrinkage | 0.5 – 2.0 % |
| Service temperature | -40 to +120 °C |
Values are typical for unfilled moulding grades at 23 °C unless stated. Glass-filled and specialty grades differ.
Typical applications
- Soft-touch handles and grip surfaces
- Overmoulded seals and gaskets
- Wearable bands and watch straps
- Cable jackets and strain reliefs
- Automotive interior soft trim
Processing notes
- Dry TPU 2 h at 80 – 100 °C. TPU is hygroscopic and moisture causes surface defects and strength loss.
- Melt 180 – 230 °C, mould 20 – 50 °C. TPE tolerates a wider window than TPU and is the safer choice for thick sections.
- For overmoulding, the substrate must be clean, dry and ideally preheated. Mechanical interlocks still matter — adhesion alone is not a warranty.
- Shore A grades below 50 are difficult to demould and prone to tearing at the gate. Design generous draft and a submarine or valve gate.
Frequently asked questions
TPE or TPU for a grip that gets handled daily?
TPU if abrasion and oils are present — tool grips, industrial handles. TPE if the priority is a dry, rubbery feel and colour stability. Both can be colour matched.
Can you overmould onto an existing part?
Yes, both insert overmoulding and two-shot moulding. Two-shot gives the better bond and lower cycle cost at volume; insert moulding is cheaper to tool for low quantities. We quote both and let the volume decide.
Related materials
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Upload a 3D model or a 2D drawing and we will come back with a DFM review, a tooling cost and a piece price — usually within two working days.
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