Process comparison
Thermoforming vs Rotational molding
Thermoforming shapes a sheet over a tool; rotational molding tumbles powder inside a heated hollow mould to build a seamless, closed part. They rarely compete directly — the part geometry usually decides.
Thermoforming vs Rotational molding — side by side
| Thermoforming | Rotational molding | |
|---|---|---|
| Part type | Open shells, covers, trays, panels | Hollow, closed, seamless parts |
| Wall control | Good, engineered by draw + plug | Less precise, thicker walls |
| Tooling cost | Low | Low to moderate |
| Cycle time | Fast (seconds to minutes) | Slow (long heat/cool cycle) |
| Surface finish | Smooth, Class-A possible | Textured, less refined |
| Best volume | Low to medium-high | Low to medium |
Choose Thermoforming when…
- Open covers, panels, trays and enclosures
- Smooth cosmetic surfaces and tighter walls
- Faster cycles / higher throughput
Choose Rotational molding when…
- Hollow, fully-closed seamless parts (tanks, floats)
- Very thick, stress-free double walls
- Complex closed geometries in one piece
Frequently asked
What is the main difference?
Thermoforming shapes a flat sheet over a one-sided tool to make open parts; rotational molding melts powder inside a closed mould to make hollow, seamless parts.
Which has a better surface finish?
Thermoforming — especially pressure-formed against a fine tool — gives a smoother, more cosmetic surface than rotomoulding.
Not sure which fits?
Tell us about your part
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